63e88f80
 Hu Chunming
提交三方库
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/*
@Copyright Barrett Adair 2015-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_CLBL_TRTS_ARGS_HPP
#define BOOST_CLBL_TRTS_ARGS_HPP
#include <boost/callable_traits/detail/core.hpp>
namespace boost { namespace callable_traits {
//[ args_hpp
/*`[section:ref_args args]
[heading Header]
``#include <boost/callable_traits/args.hpp>``
[heading Definition]
*/
template<typename T, template<class...> class Container = std::tuple>
using args_t = //see below
//<-
detail::try_but_fail_if_invalid<
typename detail::traits<
detail::shallow_decay<T>>::template expand_args<Container>,
cannot_expand_the_parameter_list_of_first_template_argument>;
namespace detail {
template<typename T, template<class...> class Container,
typename = std::false_type>
struct args_impl {};
template<typename T, template<class...> class Container>
struct args_impl <T, Container, typename std::is_same<
args_t<T, Container>, detail::dummy>::type>
{
using type = args_t<T, Container>;
};
}
//->
template<typename T,
template<class...> class Container = std::tuple>
struct args : detail::args_impl<T, Container> {};
//<-
}} // namespace boost::callable_traits
//->
/*`
[heading Constraints]
* `T` must be one of the following:
* function
* function pointer
* function reference
* member function pointer
* member data pointer
* user-defined type with a non-overloaded `operator()`
* type of a non-generic lambda
[heading Behavior]
* When the constraints are violated, a substitution failure occurs.
* When `T` is a function, function pointer, or function reference, the aliased type is `Container` instantiated with the function's parameter types.
* When `T` is a function object, the aliased type is `Container` instantiated with the `T::operator()` parameter types.
* When `T` is a member function pointer, the aliased type is a `Container` instantiation, where the first type argument is a reference to the parent class of `T`, qualified according to the member qualifiers on `T`, such that the first type is equivalent to `boost::callable_traits::qualified_class_of_t<T>`. The subsequent type arguments, if any, are the parameter types of the member function.
* When `T` is a member data pointer, the aliased type is `Container` with a single element, which is a `const` reference to the parent class of `T`.
[heading Input/Output Examples]
[table
[[`T`] [`args_t<T>`]]
[[`void(float, char, int)`] [`std::tuple<float, char, int>`]]
[[`void(*)(float, char, int)`] [`std::tuple<float, char, int`]]
[[`void(&)(float, char, int)`] [`std::tuple<float, char, int`]]
[[`void(float, char, int) const &&`][`std::tuple<float, char, int>`]]
[[`void(*)()`] [`std::tuple<>`]]
[[`void(foo::* const &)(float, char, int)`] [`std::tuple<foo&, float, char, int>`]]
[[`int(foo::*)(int) const`] [`std::tuple<const foo&, int>`]]
[[`void(foo::*)() volatile &&`] [`std::tuple<volatile foo &&>`]]
[[`int foo::*`] [`std::tuple<const foo&>`]]
[[`const int foo::*`] [`std::tuple<const foo&>`]]
[[`int`] [(substitution failure)]]
[[`int (*const)()`] [(substitution failure)]]
]
[heading Example Program]
[import ../example/args.cpp]
[args]
[endsect]
*/
//]
#endif // #ifndef BOOST_CLBL_TRTS_ARGS_HPP
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