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57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_TEST_CONVERTIBLE_HPP
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#define SUPPORT_TEST_CONVERTIBLE_HPP
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// "test_convertible<Tp, Args...>()" is a metafunction used to check if 'Tp'
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// is implicitly convertible from 'Args...' for any number of arguments,
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// Unlike 'std::is_convertible' which only allows checking for single argument
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// conversions.
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#include <type_traits>
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#include "test_macros.h"
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#if TEST_STD_VER < 11
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#error test_convertible.hpp requires C++11 or newer
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#endif
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namespace detail {
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template <class Tp> void eat_type(Tp);
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template <class Tp, class ...Args>
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constexpr auto test_convertible_imp(int)
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-> decltype(eat_type<Tp>({std::declval<Args>()...}), true)
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{ return true; }
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template <class Tp, class ...Args>
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constexpr auto test_convertible_imp(long) -> bool { return false; }
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}
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template <class Tp, class ...Args>
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constexpr bool test_convertible()
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{ return detail::test_convertible_imp<Tp, Args...>(0); }
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#endif // SUPPORT_TEST_CONVERTIBLE_HPP
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