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7c3769df62
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. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
134 lines
3.4 KiB
C++
134 lines
3.4 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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// XFAIL: availability=macosx10.13
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// XFAIL: availability=macosx10.12
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// XFAIL: availability=macosx10.11
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// XFAIL: availability=macosx10.10
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// XFAIL: availability=macosx10.9
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// XFAIL: availability=macosx10.8
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// XFAIL: availability=macosx10.7
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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 <cassert>
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#include <string>
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#include <type_traits>
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#include <variant>
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#include "test_convertible.hpp"
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#include "test_macros.h"
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#include "variant_test_helpers.hpp"
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struct Dummy {
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Dummy() = default;
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};
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struct ThrowsT {
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ThrowsT(int) noexcept(false) {}
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};
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struct NoThrowT {
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NoThrowT(int) noexcept(true) {}
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};
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struct AnyConstructible { template <typename T> AnyConstructible(T&&) {} };
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struct NoConstructible { NoConstructible() = delete; };
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void test_T_ctor_noexcept() {
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{
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using V = std::variant<Dummy, NoThrowT>;
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static_assert(std::is_nothrow_constructible<V, int>::value, "");
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}
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{
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using V = std::variant<Dummy, ThrowsT>;
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static_assert(!std::is_nothrow_constructible<V, int>::value, "");
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}
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}
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void test_T_ctor_sfinae() {
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{
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using V = std::variant<long, unsigned>;
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static_assert(!std::is_constructible<V, int>::value, "ambiguous");
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}
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{
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using V = std::variant<std::string, std::string>;
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static_assert(!std::is_constructible<V, const char *>::value, "ambiguous");
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}
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{
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using V = std::variant<std::string, void *>;
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static_assert(!std::is_constructible<V, int>::value,
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"no matching constructor");
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}
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{
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using V = std::variant<AnyConstructible, NoConstructible>;
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static_assert(
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!std::is_constructible<V, std::in_place_type_t<NoConstructible>>::value,
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"no matching constructor");
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static_assert(!std::is_constructible<V, std::in_place_index_t<1>>::value,
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"no matching constructor");
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}
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#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
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{
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using V = std::variant<int, int &&>;
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static_assert(!std::is_constructible<V, int>::value, "ambiguous");
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}
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{
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using V = std::variant<int, const int &>;
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static_assert(!std::is_constructible<V, int>::value, "ambiguous");
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}
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#endif
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}
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void test_T_ctor_basic() {
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{
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constexpr std::variant<int> v(42);
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static_assert(v.index() == 0, "");
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static_assert(std::get<0>(v) == 42, "");
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}
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{
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constexpr std::variant<int, long> v(42l);
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static_assert(v.index() == 1, "");
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static_assert(std::get<1>(v) == 42, "");
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}
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#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
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{
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using V = std::variant<const int &, int &&, long>;
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static_assert(std::is_convertible<int &, V>::value, "must be implicit");
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int x = 42;
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V v(x);
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assert(v.index() == 0);
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assert(&std::get<0>(v) == &x);
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}
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{
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using V = std::variant<const int &, int &&, long>;
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static_assert(std::is_convertible<int, V>::value, "must be implicit");
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int x = 42;
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V v(std::move(x));
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assert(v.index() == 1);
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assert(&std::get<1>(v) == &x);
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}
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#endif
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}
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int main() {
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test_T_ctor_basic();
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test_T_ctor_noexcept();
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test_T_ctor_sfinae();
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}
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