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135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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