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75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/*
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@Copyright Barrett Adair 2015-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CLBL_TRTS_class_of_HPP
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#define BOOST_CLBL_TRTS_class_of_HPP
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#include <boost/callable_traits/detail/core.hpp>
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namespace boost { namespace callable_traits {
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//[ class_of_hpp
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/*`
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[section:ref_class_of class_of]
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[heading Header]
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``#include <boost/callable_traits/class_of.hpp>``
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[heading Definition]
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*/
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template<typename T>
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using class_of_t = //see below
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//<-
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detail::try_but_fail_if_invalid<
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typename detail::traits<detail::shallow_decay<T>>::class_type,
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type_is_not_a_member_pointer>;
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namespace detail {
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template<typename T, typename = std::false_type>
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struct class_of_impl {};
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template<typename T>
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struct class_of_impl <T, typename std::is_same<
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class_of_t<T>, detail::dummy>::type>
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{
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using type = class_of_t<T>;
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};
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}
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//->
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template<typename T>
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struct class_of : detail::class_of_impl<T> {};
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//<-
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}} // namespace boost::callable_traits
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//->
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/*`
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[heading Constraints]
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* `T` must be a member pointer
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[heading Behavior]
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* A substitution failure occurs if the constraints are violated.
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* The aliased type is the parent class of the member. In other words, if `T` is expanded to `U C::*`, the aliased type is `C`.
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[heading Input/Output Examples]
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[table
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[[`T`] [`class_of_t<T>`]]
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[[`int foo::*`] [`foo`]]
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[[`void(foo::* const &)() const`] [`foo`]]
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]
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[heading Example Program]
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[import ../example/class_of.cpp]
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[class_of]
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[endsect]
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*/
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//]
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#endif // #ifndef BOOST_CLBL_TRTS_class_of_HPP
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