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- /*
- Copyright Barrett Adair 2016-2017
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
- */
- #include <boost/callable_traits/function_type.hpp>
- #include "test.hpp"
- struct foo;
- template<typename T>
- struct is_substitution_failure_function_type {
- template<typename>
- static auto test(...) -> std::true_type;
- template<typename A,
- typename std::remove_reference<
- TRAIT(function_type, A)>::type* = nullptr>
- static auto test(int) -> std::false_type;
- static constexpr bool value = decltype(test<T>(0))::value;
- };
- int main() {
- CT_ASSERT(is_substitution_failure_function_type<int>::value);
- CT_ASSERT(is_substitution_failure_function_type<int &>::value);
- CT_ASSERT(is_substitution_failure_function_type<int (foo::** &)()>::value);
- CT_ASSERT(is_substitution_failure_function_type<int (foo::** const)()>::value);
- CT_ASSERT(is_substitution_failure_function_type<int (foo::** const &)()>::value);
- CT_ASSERT(is_substitution_failure_function_type<int (foo::** volatile)()>::value);
- CT_ASSERT(!is_substitution_failure_function_type<int (foo::* &)()>::value);
- CT_ASSERT(!is_substitution_failure_function_type<int (foo::* const)()>::value);
- CT_ASSERT(!is_substitution_failure_function_type<int (foo::* const &)()>::value);
- CT_ASSERT(!is_substitution_failure_function_type<int (foo::* volatile)()>::value);
- auto lambda = [](){};
- CT_ASSERT(!is_substitution_failure_function_type<decltype(lambda)&>::value);
- CT_ASSERT(is_substitution_failure_function_type<void>::value);
- }
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