Current File : //proc/self/root/usr/include/boost/callable_traits/function_type.hpp
/*
@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_FUNCTION_TYPE_HPP
#define BOOST_CLBL_TRTS_FUNCTION_TYPE_HPP
#include <boost/callable_traits/detail/core.hpp>
namespace boost { namespace callable_traits {
//[ function_type_hpp
/*`[section:ref_function_type function_type]
[heading Header]
``#include <boost/callable_traits/function_type.hpp>``
[heading Definition]
*/
template<typename T>
using function_type_t = //see below
//<-
detail::try_but_fail_if_invalid<typename detail::traits<
detail::shallow_decay<T>>::function_type,
cannot_determine_parameters_for_this_type>;
namespace detail {
template<typename T, typename = std::false_type>
struct function_type_impl {};
template<typename T>
struct function_type_impl <T, typename std::is_same<
function_type_t<T>, detail::dummy>::type>
{
using type = function_type_t<T>;
};
}
//->
template<typename T>
struct function_type : detail::function_type_impl<T> {};
//<-
}} // 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, the aliased type is identical to `T`, except that the aliased function type will not have member qualifiers or the `transaction_safe` specifier.
* When `T` is a function pointer, the aliased type is equivalent to `std::remove_pointer_t<T>`.
* When `T` is a function reference, the aliased type is equivalent to `std::remove_reference_t<T>`.
* When `T` is a function object, the aliased type is a function type with the same return type and parameter list as `T`'s `operator()`.
* When `T` is a member function pointer, the aliased type is a function type with the same return type as `T`, and the first parameter is a reference to the parent class of `T`, qualified according to the member qualifiers on `T`. The subsequent parameters, if any, are the parameter types of `T`.
* When `T` is a member data pointer, the aliased type is a function type returning the underlying member type of `T`, taking a single parameter, which is a `const` reference to the parent type of `T`.
* In all cases, the aliased function type will not have member qualifiers, and will not have the `transaction_safe` specifier.
[heading Input/Output Examples]
[table
[[`T`] [`function_type_t<T>`]]
[[`void(int)`] [`void(int)`]]
[[`void(int) const`] [`void(int)`]]
[[`void(int) transaction_safe`] [`void(int)`]]
[[`void(*const &)(int)`] [`void(int)`]]
[[`void(&)(int)`] [`void(int)`]]
[[`void(* volatile)()`] [`void()`]]
[[`int(foo::*)(int)`] [`int(foo&, int)`]]
[[`int(foo::*)(int) const`] [`int(const foo&, int)`]]
[[`void(foo::*)() volatile &&`] [`void(volatile foo&&)`]]
[[`int foo::*`] [`int(const foo&)`]]
[[`const int foo::*`] [`int(const foo&)`]]
[[`int`] [(substitution failure)]]
]
[heading Example Program]
[import ../example/function_type.cpp]
[function_type]
[endsect]
*/
//]
#endif
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