1 2 /* 3 Copyright Barrett Adair 2016-2017 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 #include <boost/callable_traits/class_of.hpp> 11 #include "test.hpp" 12 13 struct foo; 14 15 template<typename T> 16 struct is_substitution_failure_class_of { 17 18 template<typename> 19 static auto test(...) -> std::true_type; 20 21 template<typename A, 22 typename std::remove_reference< 23 TRAIT(class_of, A)>::type* = nullptr> 24 static auto test(int) -> std::false_type; 25 26 static constexpr bool value = decltype(test<T>(0))::value; 27 }; 28 main()29int main() { 30 31 auto lambda = [](){}; 32 33 CT_ASSERT(is_substitution_failure_class_of<decltype(lambda)>::value); 34 CT_ASSERT(is_substitution_failure_class_of<decltype(lambda)&>::value); 35 CT_ASSERT(is_substitution_failure_class_of<void>::value); 36 CT_ASSERT(is_substitution_failure_class_of<void*>::value); 37 CT_ASSERT(is_substitution_failure_class_of<int>::value); 38 CT_ASSERT(is_substitution_failure_class_of<int &>::value); 39 CT_ASSERT(is_substitution_failure_class_of<int()>::value); 40 CT_ASSERT(is_substitution_failure_class_of<int(*)()>::value); 41 CT_ASSERT(is_substitution_failure_class_of<int(**)()>::value); 42 CT_ASSERT(is_substitution_failure_class_of<int(&)()>::value); 43 CT_ASSERT(is_substitution_failure_class_of<int (foo::** const)()>::value); 44 } 45 46