43 lines
1.8 KiB
C++
43 lines
1.8 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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// UNSUPPORTED: c++03, c++11, c++14
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// <variant>
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// template <class ...Types> class variant;
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// template <class T> constexpr variant(T&&) noexcept(see below);
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#include <variant>
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#include <string>
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#include <memory>
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#include "variant_test_helpers.h"
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int main(int, char**)
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{
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static_assert(!std::is_constructible<std::variant<int, int>, int>::value, "");
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static_assert(!std::is_constructible<std::variant<long, long long>, int>::value, "");
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static_assert(std::is_constructible<std::variant<char>, int>::value == VariantAllowsNarrowingConversions, "");
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static_assert(std::is_constructible<std::variant<std::string, float>, int>::value == VariantAllowsNarrowingConversions, "");
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static_assert(std::is_constructible<std::variant<std::string, double>, int>::value == VariantAllowsNarrowingConversions, "");
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static_assert(!std::is_constructible<std::variant<std::string, bool>, int>::value, "");
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static_assert(!std::is_constructible<std::variant<int, bool>, decltype("meow")>::value, "");
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static_assert(!std::is_constructible<std::variant<int, const bool>, decltype("meow")>::value, "");
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static_assert(!std::is_constructible<std::variant<int, const volatile bool>, decltype("meow")>::value, "");
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static_assert(!std::is_constructible<std::variant<bool>, std::true_type>::value, "");
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static_assert(!std::is_constructible<std::variant<bool>, std::unique_ptr<char> >::value, "");
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static_assert(!std::is_constructible<std::variant<bool>, decltype(nullptr)>::value, "");
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return 0;
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}
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