functionN.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Class template functionN</title>
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<h2><span class="refentrytitle">Class template functionN</span></h2>
<p>boost::functionN — A set of generalized function pointers that can be used for callbacks or wrapping function objects.</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../function/reference.html#header.boost.function_hpp" title="Header <boost/function.hpp>">boost/function.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> R<span class="special">,</span> <span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="function_base.html" title="Class function_base">function_base</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">R</span> <a name="boost.functionN.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">T1</span> <a name="boost.functionN.argument_type"></a><span class="identifier">argument_type</span><span class="special">;</span> <span class="comment">// If N == 1</span>
<span class="keyword">typedef</span> <span class="identifier">T1</span> <a name="boost.functionN.first_argument_type"></a><span class="identifier">first_argument_type</span><span class="special">;</span> <span class="comment">// If N == 2</span>
<span class="keyword">typedef</span> <span class="identifier">T2</span> <a name="boost.functionN.second_argument_type"></a><span class="identifier">second_argument_type</span><span class="special">;</span> <span class="comment">// If N == 2</span>
<span class="keyword">typedef</span> <span class="identifier">T1</span> <a name="boost.functionN.arg1_type"></a><span class="identifier">arg1_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">T2</span> <a name="boost.functionN.arg2_type"></a><span class="identifier">arg2_type</span><span class="special">;</span>
.
.
.
<span class="keyword">typedef</span> <span class="identifier">TN</span> <a name="boost.functionN.argN_type"></a><span class="identifier">argN_type</span><span class="special">;</span>
<span class="comment">// static constants</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> <span class="identifier">arity</span> = <span class="identifier">N</span><span class="special">;</span>
<span class="comment">// member classes/structs/unions</span>
<span class="comment">// <a class="link" href="../lambda.html" title="Chapter 18. Boost.Lambda">Lambda</a> library support</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="functionN/sig.html" title="Struct template sig">sig</a> <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">result_type</span> <a class="link" href="functionN/sig.html#boost.functionN.sig.type"><span class="identifier">type</span></a><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#boost.functionNconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_15-bb"><span class="identifier">functionN</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_16-bb"><span class="identifier">functionN</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_17-bb"><span class="identifier">functionN</span></a><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> F<span class="special">></span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_18-bb"><span class="identifier">functionN</span></a><span class="special">(</span><span class="identifier">F</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> F<span class="special">,</span> <span class="keyword">typename</span> Allocator<span class="special">></span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_19-bb"><span class="identifier">functionN</span></a><span class="special">(</span><span class="identifier">F</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">)</span><span class="special">;</span>
functionN& <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_21-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span><span class="special">)</span><span class="special">;</span>
functionN& <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_22-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_20-bb"><span class="special">~</span><span class="identifier">functionN</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_23-bb">modifiers</a></span>
<span class="keyword">void</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_23_1-bb"><span class="identifier">swap</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_23_2-bb"><span class="identifier">clear</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24-bb">capacity</a></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_2-bb"><span class="keyword">operator</span> <span class="identifier">safe_bool</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_3-bb"><span class="keyword">operator</span><span class="special">!</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25-bb">target access</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">Functor</span><span class="special">*</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25_1_1-bb"><span class="identifier">target</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">const</span> <span class="identifier">Functor</span><span class="special">*</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25_1_2-bb"><span class="identifier">target</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25_2-bb"><span class="identifier">contains</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Functor</span><span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25_3-bb"><span class="identifier">target_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_26-bb">invocation</a></span>
<span class="identifier">result_type</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_26_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">arg1_type</span><span class="special">,</span> <span class="identifier">arg2_type</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">argN_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_27-bb">specialized algorithms</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">></span>
<span class="keyword">void</span> <a class="link" href="functionN.html#boost.functionN.swap"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28-bb">comparison operators</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_1_1-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span> <span class="identifier">Functor</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_1_2-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="identifier">Functor</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_1_3-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span>
reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_1_4-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span>reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> U1<span class="special">,</span> <span class="keyword">typename</span> U2<span class="special">,</span>
<span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> UN<span class="special">></span>
<span class="keyword">void</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_1_5-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">U1</span><span class="special">,</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">UN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_2_1-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span> <span class="identifier">Functor</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_2_2-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="identifier">Functor</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_2_3-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span>
reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_2_4-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span>reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> U1<span class="special">,</span> <span class="keyword">typename</span> U2<span class="special">,</span>
<span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> UN<span class="special">></span>
<span class="keyword">void</span> <a class="link" href="functionN.html#id-1_3_15_6_2_1_3_28_2_5-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">U1</span><span class="special">,</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">UN</span><span class="special">></span><span class="special">&</span><span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.15.6.3.5.4"></a><h2>Description</h2>
<p>Class template <a class="link" href="functionN.html" title="Class template functionN">functionN</a> is
actually a family of related classes <a class="link" href="functionN.html" title="Class template functionN">function0</a>, <a class="link" href="functionN.html" title="Class template functionN">function1</a>, etc., up to some
implementation-defined maximum. In this context, <code class="computeroutput">N</code>
refers to the number of parameters.</p>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.3"></a><h3>
<a name="boost.functionNconstruct-copy-destruct"></a><code class="computeroutput">functionN</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_15-bb"></a><span class="identifier">functionN</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Postconditions:</span></p></td>
<td><code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_16-bb"></a><span class="identifier">functionN</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Postconditions:</span></p></td>
<td>Contains a copy of the <code class="computeroutput">f</code>'s target, if it has one, or is empty if <code class="computeroutput">f.<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw unless copying the target of <code class="computeroutput">f</code> throws.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_17-bb"></a><span class="identifier">functionN</span><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&&</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Requires:</span></p></td>
<td>C++11 compatible compiler.</td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>Moves the value from <code class="computeroutput">f</code> to <code class="computeroutput">*this</code>. If the argument has its function object allocated on the heap, its buffer will be assigned to <code class="computeroutput">*this</code> leaving argument empty.</td>
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<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw unless argument has its function object allocated not on the heap and copying the target of <code class="computeroutput">f</code> throws.</td>
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<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> F<span class="special">></span> <a name="id-1_3_15_6_2_1_3_18-bb"></a><span class="identifier">functionN</span><span class="special">(</span><span class="identifier">F</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Requires:</span></p></td>
<td>F is a function object Callable from <code class="computeroutput">this</code>.</td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<code class="computeroutput">*this</code> targets a copy of <code class="computeroutput">f</code> if <code class="computeroutput">f</code> is nonempty, or <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code> if <code class="computeroutput">f</code> is empty.</td>
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<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> F<span class="special">,</span> <span class="keyword">typename</span> Allocator<span class="special">></span> <a name="id-1_3_15_6_2_1_3_19-bb"></a><span class="identifier">functionN</span><span class="special">(</span><span class="identifier">F</span> f<span class="special">,</span> <span class="identifier">Allocator</span> alloc<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Requires:</span></p></td>
<td>F is a function object Callable from <code class="computeroutput">this</code>, Allocator is an allocator. The copy constructor and destructor of Allocator shall not throw.</td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<code class="computeroutput">*this</code> targets a copy of <code class="computeroutput">f</code> if <code class="computeroutput">f</code> is nonempty, or <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code> if <code class="computeroutput">f</code> is empty.</td>
</tr>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td>If memory allocation is required, the given allocator (or a copy of it) will be used to allocate that memory.</td>
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</tbody>
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</li>
<li class="listitem">
<pre class="literallayout">functionN& <a name="id-1_3_15_6_2_1_3_21-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Postconditions:</span></p></td>
<td>If copy construction does not throw, <code class="computeroutput">*this</code> targets a copy of <code class="computeroutput">f</code>'s target, if it has one, or is empty if <code class="computeroutput">f.<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>. If copy construction does throw, <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>.</td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout">functionN& <a name="id-1_3_15_6_2_1_3_22-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&&</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Requires:</span></p></td>
<td>C++11 compatible compiler.</td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>Moves the value from <code class="computeroutput">f</code> to <code class="computeroutput">*this</code>. If the argument has its function object allocated on the heap, its buffer will be assigned to <code class="computeroutput">*this</code> leaving argument empty.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw unless argument has its function object allocated not on the heap and copying the target of <code class="computeroutput">f</code> throws.</td>
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</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_20-bb"></a><span class="special">~</span><span class="identifier">functionN</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Effects:</span></p></td>
<td>If <code class="computeroutput">!this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>, destroys the target of this.</td>
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</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.4"></a><h3>
<a name="id-1_3_15_6_2_1_3_23-bb"></a><code class="computeroutput">functionN</code> modifiers</h3>
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<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_15_6_2_1_3_23_1-bb"></a><span class="identifier">swap</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Effects:</span></p></td>
<td>Interchanges the targets of <code class="computeroutput">*this</code> and <code class="computeroutput">f</code>.</td>
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<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id-1_3_15_6_2_1_3_23_2-bb"></a><span class="identifier">clear</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
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<td><p><span class="term">Postconditions:</span></p></td>
<td>this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.5"></a><h3>
<a name="id-1_3_15_6_2_1_3_24-bb"></a><code class="computeroutput">functionN</code> capacity</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_24_1-bb"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<td><p><span class="term">Returns:</span></p></td>
<td>
<code class="computeroutput">false</code> if <code class="computeroutput">this</code> has a target, and <code class="computeroutput">true</code> otherwise.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_24_2-bb"></a><span class="keyword">operator</span> <span class="identifier">safe_bool</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<td><p><span class="term">Returns:</span></p></td>
<td>A <code class="computeroutput">safe_bool</code> that evaluates <code class="computeroutput">false</code> in a boolean context when <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>, and <code class="computeroutput">true</code> otherwise.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_24_3-bb"></a><span class="keyword">operator</span><span class="special">!</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<td><p><span class="term">Returns:</span></p></td>
<td><code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.6"></a><h3>
<a name="id-1_3_15_6_2_1_3_25-bb"></a><code class="computeroutput">functionN</code> target access</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_15_6_2_1_3_25_1-bb"></a><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">Functor</span><span class="special">*</span> <a name="id-1_3_15_6_2_1_3_25_1_1-bb"></a><span class="identifier">target</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">const</span> <span class="identifier">Functor</span><span class="special">*</span> <a name="id-1_3_15_6_2_1_3_25_1_2-bb"></a><span class="identifier">target</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>If <code class="computeroutput">this</code> stores a target of type
<code class="computeroutput">Functor</code>, returns the address of the
target. Otherwise, returns the NULL
pointer.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_25_2-bb"></a><span class="identifier">contains</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Functor</span><span class="special">&</span> f<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td>
<code class="computeroutput">true</code> if <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_25_1-bb">target</a><Functor>()</code> is non-NULL and <code class="computeroutput"><a class="link" href="function_equal.html" title="Function template function_equal">function_equal</a>(*(this->target<Functor>()), f)</code>
</td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span><span class="special">&</span> <a name="id-1_3_15_6_2_1_3_25_3-bb"></a><span class="identifier">target_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>
<code class="computeroutput">typeid</code> of the target function object, or <code class="computeroutput">typeid(void)</code> if <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.7"></a><h3>
<a name="id-1_3_15_6_2_1_3_26-bb"></a><code class="computeroutput">functionN</code> invocation</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="id-1_3_15_6_2_1_3_26_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">arg1_type</span> a1<span class="special">,</span> <span class="identifier">arg2_type</span> a2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">argN_type</span> aN<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
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<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td>
<code class="computeroutput">f(a1, a2, ..., aN)</code>, where <code class="computeroutput">f</code> is the target of <code class="computeroutput">*this</code>.</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>if <code class="computeroutput">R</code> is <code class="computeroutput">void</code>, nothing is returned; otherwise, the return value of the call to <code class="computeroutput">f</code> is returned.</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>
<code class="computeroutput"><a class="link" href="bad_function_call.html" title="Class bad_function_call">bad_function_call</a></code> if <code class="computeroutput">this-><a class="link" href="functionN.html#id-1_3_15_6_2_1_3_24_1-bb">empty</a>()</code>. Otherwise, may through any exception thrown by the target function <code class="computeroutput">f</code>.</td>
</tr>
</tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.9"></a><h3>
<a name="id-1_3_15_6_2_1_3_27-bb"></a><code class="computeroutput">functionN</code> specialized algorithms</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">></span>
<span class="keyword">void</span> <a name="boost.functionN.swap"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f1<span class="special">,</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f2<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Effects:</span></p></td>
<td><code class="computeroutput">f1.<a class="link" href="functionN.html#id-1_3_15_6_2_1_3_23_1-bb">swap</a>(f2)</code></td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.15.6.3.5.4.10"></a><h3>
<a name="id-1_3_15_6_2_1_3_28-bb"></a><code class="computeroutput">functionN</code> comparison operators</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<p><a name="boost.functionN.operator=="></a></p>
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_1_1-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">,</span> <span class="identifier">Functor</span> g<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_1_2-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="identifier">Functor</span> g<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_1_3-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">,</span>
reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span> g<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_1_4-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span>reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span> g<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> U1<span class="special">,</span> <span class="keyword">typename</span> U2<span class="special">,</span>
<span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> UN<span class="special">></span>
<span class="keyword">void</span> <a name="id-1_3_15_6_2_1_3_28_1_5-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f1<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">U1</span><span class="special">,</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">UN</span><span class="special">></span><span class="special">&</span> f2<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>True when <code class="computeroutput">f</code> stores an object of
type <code class="computeroutput">Functor</code> and one of the following conditions applies:
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="computeroutput">g</code> is of type
<code class="computeroutput">reference_wrapper<Functor></code>
and <code class="computeroutput">f.target<Functor>() == g.get_pointer()</code>.</li>
<li class="listitem">
<code class="computeroutput">g</code> is not of type
<code class="computeroutput">reference_wrapper<Functor></code>
and
<code class="computeroutput"><a class="link" href="function_equal.html" title="Function template function_equal">function_equal</a>(*(f.target<Functor>()),
g)</code>.</li>
</ul></div>
</td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<code class="computeroutput"><a class="link" href="functionN.html" title="Class template functionN">functionN</a></code>
objects are not
<a class="link" href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>.</td>
</tr>
<tr>
<td><p><span class="term">Rationale:</span></p></td>
<td>The <code class="computeroutput">safe_bool</code> conversion
opens a loophole whereby two <code class="computeroutput">functionN</code>
instances can be compared via <code class="computeroutput">==</code>, although this
is not feasible to implement. The undefined <code class="computeroutput">void
operator==</code> closes the loophole and ensures a
compile-time or link-time error.</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<p><a name="boost.functionN.operator!="></a></p>
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_2_1-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">,</span> <span class="identifier">Functor</span> g<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_2_2-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="identifier">Functor</span> g<span class="special">,</span> <span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_2_3-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">,</span>
reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span> g<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">></span>
<span class="keyword">bool</span> <a name="id-1_3_15_6_2_1_3_28_2_4-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span>reference_wrapper<span class="special"><</span><span class="identifier">Functor</span><span class="special">></span> g<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T1<span class="special">,</span> <span class="keyword">typename</span> T2<span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> TN<span class="special">,</span> <span class="keyword">typename</span> U1<span class="special">,</span> <span class="keyword">typename</span> U2<span class="special">,</span>
<span class="special">...</span><span class="special">,</span> <span class="keyword">typename</span> UN<span class="special">></span>
<span class="keyword">void</span> <a name="id-1_3_15_6_2_1_3_28_2_5-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">T1</span><span class="special">,</span> <span class="identifier">T2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">></span><span class="special">&</span> f1<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="functionN.html" title="Class template functionN">functionN</a><span class="special"><</span><span class="identifier">U1</span><span class="special">,</span> <span class="identifier">U2</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">UN</span><span class="special">></span><span class="special">&</span> f2<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td>True when <code class="computeroutput">f</code> does not store an
object of type <code class="computeroutput">Functor</code> or it stores an object of
type <code class="computeroutput">Functor</code> and one of the following conditions
applies:
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="computeroutput">g</code> is of type
<code class="computeroutput">reference_wrapper<Functor></code>
and <code class="computeroutput">f.target<Functor>() != g.get_pointer()</code>.</li>
<li class="listitem">
<code class="computeroutput">g</code> is not of type
<code class="computeroutput">reference_wrapper<Functor></code>
and <code class="computeroutput">!<a class="link" href="function_equal.html" title="Function template function_equal">function_equal</a>(*(f.target<Functor>()), g)</code>.</li>
</ul></div>
</td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<code class="computeroutput"><a class="link" href="functionN.html" title="Class template functionN">functionN</a></code>
objects are not
<a class="link" href="../EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a>.</td>
</tr>
<tr>
<td><p><span class="term">Rationale:</span></p></td>
<td>The <code class="computeroutput">safe_bool</code> conversion
opens a loophole whereby two <code class="computeroutput">functionN</code>
instances can be compared via <code class="computeroutput">!=</code>, although this
is not feasible to implement. The undefined <code class="computeroutput">void
operator!=</code> closes the loophole and ensures a
compile-time or link-time error.</td>
</tr>
</tbody>
</table></div>
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