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124 lines
4.1 KiB
C++
124 lines
4.1 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_APPLY_MEMBER_POINTER_HPP
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#define BOOST_CLBL_TRTS_APPLY_MEMBER_POINTER_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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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(apply_member_pointer)
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BOOST_CLBL_TRTS_SFINAE_MSG(apply_member_pointer, members_cannot_have_a_type_of_void)
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BOOST_CLBL_TRTS_SFINAE_MSG(apply_member_pointer, second_template_argument_must_be_a_class_or_struct)
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namespace detail {
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template<typename T, typename C, bool = std::is_class<C>::value>
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struct make_member_pointer;
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template<typename T, typename C>
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struct make_member_pointer<T, C, true> {
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using type = typename std::remove_reference<T>::type C::*;
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};
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template<typename C>
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struct make_member_pointer<void, C, true> {
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using type = invalid_type;
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};
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template<typename T, typename C>
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struct make_member_pointer<T, C, false> {
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using type = error_type<T>;
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};
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template<typename T, typename C>
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using make_member_pointer_t = typename make_member_pointer<T, C>::type;
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}
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//[ apply_member_pointer_hpp
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/*`
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[section:ref_apply_member_pointer apply_member_pointer]
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[heading Header]
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``#include <boost/callable_traits/apply_member_pointer.hpp>``
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[heading Definition]
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*/
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template<typename T, typename C>
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using apply_member_pointer_t = //see below
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//<-
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detail::sfinae_try<
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detail::fallback_if_invalid<
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typename detail::traits<T>::template apply_member_pointer<C>,
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typename detail::make_member_pointer<T, C>::type>,
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detail::fail_when_same<void, T, members_cannot_have_a_type_of_void>,
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detail::fail_if<!std::is_class<C>::value,
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second_template_argument_must_be_a_class_or_struct> >;
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namespace detail {
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template<typename T, typename C, typename = std::false_type>
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struct apply_member_pointer_impl {};
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template<typename T, typename C>
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struct apply_member_pointer_impl <T, C, typename std::is_same<
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apply_member_pointer_t<T, C>, detail::dummy>::type>
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{
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using type = apply_member_pointer_t<T, C>;
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};
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}
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//->
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template<typename T, typename C>
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struct apply_member_pointer : detail::apply_member_pointer_impl<T, C> {};
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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` may be any type except `void`
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* `C` must be a user-defined type
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[heading Behavior]
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* A substitution failure occurs if the constraints are violated.
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* When `T` is a function, function pointer (unqualified), or function reference, then the aliased type is a member function pointer of `C` with the same parameters and return type.
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* When `T` is a member function pointer (unqualified) of any type, the aliased type is a member function pointer of `C` with the same parameters and return type.
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* Otherwise, the aliased type is a member data pointer equivalent to `std::remove_reference_t<T> C::*`.
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[heading Input/Output Examples]
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[table
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[[`T`] [`apply_member_pointer_t<T, foo>`]]
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[[`int()`] [`int(foo::*)()`]]
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[[`int (&)()`] [`int(foo::*)()`]]
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[[`int (*)()`] [`int(foo::*)()`]]
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[[`int(bar::*)()`] [`int(foo::*)()`]]
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[[`int(bar::*)() &`] [`int(foo::*)() &`]]
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[[`int(bar::*)() &&`] [`int(foo::*)() &&`]]
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[[`int(bar::*)() const`] [`int(foo::*)() const`]]
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[[`int(bar::*)() transaction_safe`] [`int(foo::*)() transaction_safe`]]
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[[`int bar::*`] [`int foo::*`]]
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[[`int`] [`int foo::*`]]
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[[`int &`] [`int foo::*`]]
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[[`const int &`] [`const int foo::*`]]
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[[`int (*const)()`] [`int (*const foo::*)()`]]
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[[`void`] [(substitution failure)]]
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]
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[heading Example Program]
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[import ../example/apply_member_pointer.cpp]
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[apply_member_pointer]
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[endsect]
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*/
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//]
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#endif
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