1 /* 2 3 @Copyright Barrett Adair 2015-2017 4 Distributed under the Boost Software License, Version 1.0. 5 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 6 7 */ 8 9 #ifndef BOOST_CLBL_TRTS_HAS_MEMBER_QUALIFIERS_HPP 10 #define BOOST_CLBL_TRTS_HAS_MEMBER_QUALIFIERS_HPP 11 12 #include <boost/callable_traits/detail/core.hpp> 13 14 namespace boost { namespace callable_traits { 15 16 //[ has_member_qualifiers_hpp 17 /*`[section:ref_has_member_qualifiers has_member_qualifiers] 18 [heading Header] 19 ``#include <boost/callable_traits/has_member_qualifiers.hpp>`` 20 [heading Definition] 21 */ 22 23 // inherits from either std::true_type or std::false_type 24 template<typename T> 25 struct has_member_qualifiers; 26 27 //<- 28 template<typename T> 29 struct has_member_qualifiers : detail::traits< 30 detail::shallow_decay<T>>::has_member_qualifiers { 31 32 using type = typename detail::traits< 33 detail::shallow_decay<T>>::has_member_qualifiers; 34 }; 35 36 // older compilers don't support variable templates 37 #ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES 38 39 template<typename T> 40 struct has_member_qualifiers_v { 41 static_assert(std::is_same<T, detail::dummy>::value, 42 "Variable templates not supported on this compiler."); 43 }; 44 45 #else 46 //-> 47 // only available when variable templates are supported 48 template<typename T> 49 //<- 50 BOOST_CLBL_TRAITS_INLINE_VAR 51 //-> 52 constexpr bool has_member_qualifiers_v = //see below 53 //<- 54 detail::traits<detail::shallow_decay<T>>::has_member_qualifiers::value; 55 56 #endif 57 58 }} // namespace boost::callable_traits 59 //-> 60 61 /*` 62 [heading Constraints] 63 * none 64 65 [heading Behavior] 66 * `std::false_type` is inherited by `has_member_qualifiers<T>` and is aliased by `typename has_member_qualifiers<T>::type`, except when one of the following criteria is met, in which case `std::true_type` would be similarly inherited and aliased: 67 * `T` is a function with member qualifiers 68 * `T` is a member function pointer with member qualifiers 69 * `T` is a function object with a member-qualified `operator()` 70 * On compilers that support variable templates, `has_member_qualifiers_v<T>` is equivalent to `has_member_qualifiers<T>::value`. 71 72 [heading Input/Output Examples] 73 [table 74 [[`T`] [`has_member_qualifiers_v<T>`]] 75 [[`void() const`] [`true`]] 76 [[`void() const transaction_safe`] [`true`]] 77 [[`void() volatile &&`] [`true`]] 78 [[`int(foo::*)() &`] [`true`]] 79 [[`void(foo::*)() const`] [`true`]] 80 [[`void(foo::*&)() const`] [`true`]] 81 [[`void(foo::* const)() const`] [`true`]] 82 [[`void()`] [`false`]] 83 [[`void() transaction_safe`] [`false`]] 84 [[`void(*)()`] [`false`]] 85 [[`void(*&)()`] [`false`]] 86 [[`int`] [`false`]] 87 [[`const int`] [`false`]] 88 [[`int foo::*`] [`false`]] 89 [[`const int foo::*`] [`false`]] 90 ] 91 92 [heading Example Program] 93 [import ../example/has_member_qualifiers.cpp] 94 [has_member_qualifiers] 95 [endsect] 96 */ 97 //] 98 99 #endif //BOOST_CLBL_TRTS_HAS_MEMBER_QUALIFIERS_HPP 100