boost/callable_traits/remove_member_const.hpp

0001 /*
0002
0003 @Copyright Barrett Adair 2015-2017
0004 Distributed under the Boost Software License, Version 1.0.
0005 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
0006
0007 */
0008
0009 #ifndef BOOST_CLBL_TRTS_REMOVE_MEMBER_CONST_HPP
0010 #define BOOST_CLBL_TRTS_REMOVE_MEMBER_CONST_HPP
0011
0012 #include <boost/callable_traits/detail/core.hpp>
0013
0014 namespace boost { namespace callable_traits {
0015
0016 //[ remove_member_const_hpp
0017 /*`
0018 [section:ref_remove_member_const remove_member_const]
0019 [heading Header]
0020 ``#include <boost/callable_traits/remove_member_const.hpp>``
0021 [heading Definition]
0022 */
0023
0024 template<typename T>
0025 using remove_member_const_t = //see below
0026 //<-
0027     detail::try_but_fail_if_invalid<
0028         typename detail::traits<T>::remove_member_const,
0029         member_qualifiers_are_illegal_for_this_type>;
0030
0031 namespace detail {
0032
0033     template<typename T, typename = std::false_type>
0034     struct remove_member_const_impl {};
0035
0036     template<typename T>
0037     struct remove_member_const_impl <T, typename std::is_same<
0038         remove_member_const_t<T>, detail::dummy>::type>
0039     {
0040         using type = remove_member_const_t<T>;
0041     };
0042 }
0043
0044 //->
0045
0046 template<typename T>
0047 struct remove_member_const : detail::remove_member_const_impl<T> {};
0048
0049 //<-
0050 }} // namespace boost::callable_traits
0051 //->
0052
0053 /*`
0054 [heading Constraints]
0055 * `T` must be a function type or a member function pointer type
0056 * If `T` is a pointer, it may not be cv/ref qualified
0057
0058 [heading Behavior]
0059 * A substitution failure occurs if the constraints are violated.
0060 * Removes the member `const` qualifier from `T`, if present.
0061
0062 [heading Input/Output Examples]
0063 [table
0064     [[`T`]                              [`remove_member_const_t<T>`]]
0065     [[`int() const`]                    [`int()`]]
0066     [[`int(foo::*)() const`]            [`int(foo::*)()`]]
0067     [[`int(foo::*)() const &`]          [`int(foo::*)() &`]]
0068     [[`int(foo::*)() const &&`]         [`int(foo::*)() &&`]]
0069     [[`int(foo::*)() const`]            [`int(foo::*)()`]]
0070     [[`int(foo::*)() const volatile`]   [`int(foo::*)() volatile`]]
0071     [[`int`]                            [(substitution failure)]]
0072     [[`int (&)()`]                      [(substitution failure)]]
0073     [[`int (*)()`]                      [(substitution failure)]]
0074     [[`int foo::*`]                     [(substitution failure)]]
0075     [[`int (foo::* const)()`]           [(substitution failure)]]
0076 ]
0077
0078 [heading Example Program]
0079 [import ../example/remove_member_const.cpp]
0080 [remove_member_const]
0081 [endsect]
0082 */
0083 //]
0084
0085 #endif // #ifndef BOOST_CLBL_TRTS_REMOVE_MEMBER_CONST_HPP