forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SUPPORT_TEST_CONVERTIBLE_HPP
|
|
#define SUPPORT_TEST_CONVERTIBLE_HPP
|
|
|
|
// "test_convertible<Tp, Args...>()" is a metafunction used to check if 'Tp'
|
|
// is implicitly convertible from 'Args...' for any number of arguments,
|
|
// Unlike 'std::is_convertible' which only allows checking for single argument
|
|
// conversions.
|
|
|
|
#include <type_traits>
|
|
|
|
#include "test_macros.h"
|
|
|
|
#if TEST_STD_VER < 11
|
|
#error test_convertible.hpp requires C++11 or newer
|
|
#endif
|
|
|
|
namespace detail {
|
|
template <class Tp> void eat_type(Tp);
|
|
|
|
template <class Tp, class ...Args>
|
|
constexpr auto test_convertible_imp(int)
|
|
-> decltype(eat_type<Tp>({std::declval<Args>()...}), true)
|
|
{ return true; }
|
|
|
|
template <class Tp, class ...Args>
|
|
constexpr auto test_convertible_imp(long) -> bool { return false; }
|
|
}
|
|
|
|
template <class Tp, class ...Args>
|
|
constexpr bool test_convertible()
|
|
{ return detail::test_convertible_imp<Tp, Args...>(0); }
|
|
|
|
#endif // SUPPORT_TEST_CONVERTIBLE_HPP
|