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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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