mirror of
https://github.com/boostorg/callable_traits.git
synced 2026-01-24 05:42:12 +00:00
57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
|
|
/*
|
|
Copyright Barrett Adair 2016
|
|
|
|
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/arg_at.hpp>
|
|
#include "test.hpp"
|
|
|
|
struct foo;
|
|
|
|
template<std::size_t I, typename T>
|
|
struct is_substitution_failure_arg_at {
|
|
|
|
template<typename>
|
|
static auto test(...) -> std::true_type;
|
|
|
|
template<typename U,
|
|
typename std::remove_reference<arg_at_t<I, U>>::type* = nullptr>
|
|
static auto test(int) -> std::false_type;
|
|
|
|
static constexpr bool value = decltype(test<T>(0))::value;
|
|
};
|
|
|
|
template<std::size_t I, typename T>
|
|
void assert_sfinae_arg_at() {
|
|
CT_ASSERT(is_substitution_failure_arg_at<I, T>::value);
|
|
}
|
|
|
|
int main() {
|
|
|
|
assert_sfinae_arg_at<0, int>();
|
|
assert_sfinae_arg_at<0, int &>();
|
|
assert_sfinae_arg_at<0, int (* const &)()>();
|
|
assert_sfinae_arg_at<0, int (foo::* &)()>();
|
|
assert_sfinae_arg_at<0, int (foo::* const)()>();
|
|
assert_sfinae_arg_at<0, int (foo::* const &)()>();
|
|
assert_sfinae_arg_at<0, int (foo::* volatile)()>();
|
|
|
|
auto lambda = [](){};
|
|
assert_sfinae_arg_at<0, decltype(lambda)>();
|
|
assert_sfinae_arg_at<0, decltype(lambda)&>();
|
|
assert_sfinae_arg_at<0, void>();
|
|
|
|
using f = int(int, int);
|
|
assert_sfinae_arg_at<2, f>();
|
|
assert_sfinae_arg_at<17, f>();
|
|
|
|
using g = int(foo::*)(int, int);
|
|
assert_sfinae_arg_at<3, g>();
|
|
assert_sfinae_arg_at<4, g>();
|
|
}
|
|
|