blob: 322ef506de7347a4e5fd425b93b8382f53061c04 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#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
|
