1 /* 2 3 @Copyright Barrett Adair 2015-2017 4 5 Distributed under the Boost Software License, Version 1.0. 6 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 7 8 */ 9 10 #ifndef BOOST_CLBL_TRTS_IS_REFERENCE_MEMBER_HPP 11 #define BOOST_CLBL_TRTS_IS_REFERENCE_MEMBER_HPP 12 13 #include <boost/callable_traits/detail/core.hpp> 14 15 namespace boost { namespace callable_traits { 16 17 //[ is_reference_member_hpp 18 /*`[section:ref_is_reference_member is_reference_member] 19 [heading Header] 20 ``#include <boost/callable_traits/is_reference_member.hpp>`` 21 [heading Definition] 22 */ 23 24 25 // inherits from either std::true_type or std::false_type 26 template<typename T> 27 struct is_reference_member; 28 29 //<- 30 template<typename T> 31 struct is_reference_member : detail::traits< 32 detail::shallow_decay<T>>::is_reference_member { 33 34 using type = typename detail::traits< 35 detail::shallow_decay<T>>::is_reference_member; 36 }; 37 38 #ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES 39 40 template<typename T> 41 struct is_reference_member_v { 42 static_assert(std::is_same<T, detail::dummy>::value, 43 "Variable templates not supported on this compiler."); 44 }; 45 46 #else 47 //-> 48 // only available when variable templates are supported 49 template<typename T> 50 //<- 51 BOOST_CLBL_TRAITS_INLINE_VAR 52 //-> 53 constexpr bool is_reference_member_v = //see below 54 //<- 55 detail::traits<detail::shallow_decay<T>>::is_reference_member::value; 56 57 #endif 58 59 }} // namespace boost::callable_traits 60 //-> 61 62 /*` 63 [heading Constraints] 64 * none 65 66 [heading Behavior] 67 * `is_reference_member<T>::value` is `true` when either: 68 * `T` is a function type with a '&' or '&&' member qualifier 69 * `T` is a pointer to a member function with a '&' or '&&' member qualifiers 70 * `T` is a function object with a non-overloaded `operator()`, where the `operator()` has a '&' or '&&' member qualifier 71 * On compilers that support variable templates, `is_reference_member_v<T>` is equivalent to `is_reference_member<T>::value`. 72 73 [heading Input/Output Examples] 74 [table 75 [[`T`] [`is_reference_member_v<T>`]] 76 [[`int() &`] [`true`]] 77 [[`int() const &&`] [`true`]] 78 [[`int(foo::* const)() &&`] [`true`]] 79 [[`int(foo::*)(...) volatile &`] [`true`]] 80 [[`int() const`] [`false`]] 81 [[`int() volatile`] [`false`]] 82 [[`int(foo::*)() const`] [`false`]] 83 [[`int() const`] [`false`]] 84 [[`int() volatile`] [`false`]] 85 [[`int(*)()`] [`false`]] 86 [[`int`] [`false`]] 87 [[`int foo::*`] [`false`]] 88 [[`const int foo::*`] [`false`]] 89 ] 90 91 [heading Example Program] 92 [import ../example/is_reference_member.cpp] 93 [is_reference_member] 94 [endsect] 95 */ 96 //] 97 98 #endif // #ifndef BOOST_CLBL_TRTS_IS_REFERENCE_MEMBER_HPP 99