63e88f80
 Hu Chunming
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/*=============================================================================
Copyright (c) 2014 Paul Fultz II
is_invocable.h
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#ifndef BOOST_HOF_GUARD_IS_CALLABLE_H
#define BOOST_HOF_GUARD_IS_CALLABLE_H
/// is_invocable
/// ===========
///
/// Description
/// -----------
///
/// The `is_invocable` metafunction checks if the function is callable with
/// certain parameters.
///
/// Requirements
/// ------------
///
/// F must be:
///
/// * [Invocable](Invocable)
///
/// Synopsis
/// --------
///
/// template<class F, class... Ts>
/// struct is_invocable;
///
/// Example
/// -------
///
/// #include <boost/hof.hpp>
/// using namespace boost::hof;
///
/// struct is_invocable_class
/// {
/// void operator()(int) const
/// {
/// }
/// };
/// static_assert(is_invocable<is_invocable_class, int>(), "Not callable");
///
/// int main() {}
///
#include <boost/hof/detail/can_be_called.hpp>
#include <boost/hof/apply.hpp>
namespace boost { namespace hof {
template<class F, class... Ts>
struct is_invocable
: detail::can_be_called<detail::apply_f, F, Ts...>
{};
template<class F, class... Ts, class... Us>
struct is_invocable<F(Ts...), Us...>
{
static_assert(!std::is_same<F, F>::value,
"The is_invocable<F(Args...)> form is not supported because it is problematic."
"Please use is_invocable<F, Args...> instead."
);
};
}} // namespace boost::hof
#endif
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