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b6e011b18b
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@362252 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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++98, c++03, c++11, c++14
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// <variant>
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// template <class T> struct variant_size; // undefined
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// template <class T> struct variant_size<const T>;
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// template <class T> struct variant_size<volatile T>;
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// template <class T> struct variant_size<const volatile T>;
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// template <class T> constexpr size_t variant_size_v
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// = variant_size<T>::value;
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#include <memory>
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#include <type_traits>
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#include <variant>
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#include "test_macros.h"
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template <class V, size_t E> void test() {
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static_assert(std::variant_size<V>::value == E, "");
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static_assert(std::variant_size<const V>::value == E, "");
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static_assert(std::variant_size<volatile V>::value == E, "");
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static_assert(std::variant_size<const volatile V>::value == E, "");
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static_assert(std::variant_size_v<V> == E, "");
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static_assert(std::variant_size_v<const V> == E, "");
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static_assert(std::variant_size_v<volatile V> == E, "");
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static_assert(std::variant_size_v<const volatile V> == E, "");
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static_assert(std::is_base_of<std::integral_constant<std::size_t, E>,
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std::variant_size<V>>::value,
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"");
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};
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int main(int, char**) {
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test<std::variant<>, 0>();
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test<std::variant<void *>, 1>();
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test<std::variant<long, long, void *, double>, 4>();
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return 0;
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}
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