115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
/*
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@Copyright Barrett Adair 2015-2018
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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_ADD_MEMBER_LVALUE_REFERENCE_HPP
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#define BOOST_CLBL_TRTS_ADD_MEMBER_LVALUE_REFERENCE_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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//[ add_member_lvalue_reference_hpp
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/*`
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[section:ref_add_member_lvalue_reference add_member_lvalue_reference]
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[heading Header]
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``#include <boost/callable_traits/add_member_lvalue_reference.hpp>``
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[heading Definition]
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*/
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//<-
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#ifdef BOOST_CLBL_TRTS_DISABLE_REFERENCE_QUALIFIERS
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template<typename T>
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struct add_member_lvalue_reference_t {
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static_assert(std::is_same<T, detail::dummy>::value,
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"Reference member qualifiers are not supported by this configuration.");
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};
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#else
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//->
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template<typename T>
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using add_member_lvalue_reference_t = //see below
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//<-
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#ifdef BOOST_CLBL_TRTS_DISABLE_ABOMINABLE_FUNCTIONS
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detail::sfinae_try<
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typename detail::traits<T>::add_member_lvalue_reference,
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detail::fail_when_same<typename detail::traits<T>::add_member_lvalue_reference,
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detail::abominable_functions_not_supported_on_this_compiler,
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this_compiler_doesnt_support_abominable_function_types>,
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detail::fail_if_invalid<
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typename detail::traits<T>::add_member_lvalue_reference,
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member_qualifiers_are_illegal_for_this_type>>;
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#else
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detail::try_but_fail_if_invalid<
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typename detail::traits<T>::add_member_lvalue_reference,
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member_qualifiers_are_illegal_for_this_type>;
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#endif // #ifdef BOOST_CLBL_TRTS_DISABLE_ABOMINABLE_FUNCTIONS
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#endif // #ifdef BOOST_CLBL_TRTS_DISABLE_REFERENCE_QUALIFIERS
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namespace detail {
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template<typename T, typename = std::false_type>
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struct add_member_lvalue_reference_impl {};
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template<typename T>
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struct add_member_lvalue_reference_impl <T, typename std::is_same<
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add_member_lvalue_reference_t<T>, detail::dummy>::type>
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{
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using type = add_member_lvalue_reference_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 add_member_lvalue_reference
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: detail::add_member_lvalue_reference_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 function type or a member function pointer type
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* If `T` is a pointer, it may not be cv/ref qualified
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[heading Behavior]
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* A substitution failure occurs if the constraints are violated.
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* Adds a member lvalue reference qualifier (`&`) to `T`, if not already present.
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* If an rvalue reference qualifier is present, the lvalue reference qualifier replaces it (in accordance with reference collapsing rules).
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[heading Input/Output Examples]
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[table
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[[`T`] [`add_member_lvalue_reference_t<T>`]]
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[[`int()`] [`int() &`]]
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[[`int(foo::*)()`] [`int(foo::*)() &`]]
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[[`int(foo::*)() &`] [`int(foo::*)() &`]]
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[[`int(foo::*)() &&`] [`int(foo::*)() &`]]
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[[`int(foo::*)() const`] [`int(foo::*)() const &`]]
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[[`int(foo::*)() transaction_safe`] [`int(foo::*)() & transaction_safe`]]
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[[`int`] [(substitution failure)]]
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[[`int (&)()`] [(substitution failure)]]
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[[`int (*)()`] [(substitution failure)]]
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[[`int foo::*`] [(substitution failure)]]
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[[`int (foo::* const)()`] [(substitution failure)]]
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]
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[heading Example Program]
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[import ../example/add_member_lvalue_reference.cpp]
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[add_member_lvalue_reference]
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[endsect]
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*/
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//]
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#endif
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