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907c1196a7
Libc++ is used as a system library on macOS and iOS (amongst others). In order for users to be able to compile a binary that is intended to be deployed to an older version of the platform, clang provides the availability attribute <https://clang.llvm.org/docs/AttributeReference.html#availability>_ that can be placed on declarations to describe the lifecycle of a symbol in the library. See docs/DesignDocs/AvailabilityMarkup.rst for more information. Differential Revision: https://reviews.llvm.org/D31739 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302172 91177308-0d34-0410-b5e6-96231b3b80d8
120 lines
2.7 KiB
C++
120 lines
2.7 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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// XFAIL: with_system_cxx_lib=macosx10.12
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// XFAIL: with_system_cxx_lib=macosx10.11
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// XFAIL: with_system_cxx_lib=macosx10.10
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// XFAIL: with_system_cxx_lib=macosx10.9
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// XFAIL: with_system_cxx_lib=macosx10.7
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// XFAIL: with_system_cxx_lib=macosx10.8
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// <variant>
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// template <class ...Types> class variant;
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// constexpr variant() noexcept(see below);
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#include <cassert>
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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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#include "variant_test_helpers.hpp"
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struct NonDefaultConstructible {
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NonDefaultConstructible(int) {}
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};
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struct NotNoexcept {
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NotNoexcept() noexcept(false) {}
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};
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#ifndef TEST_HAS_NO_EXCEPTIONS
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struct DefaultCtorThrows {
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DefaultCtorThrows() { throw 42; }
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};
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#endif
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void test_default_ctor_sfinae() {
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{
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using V = std::variant<std::monostate, int>;
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static_assert(std::is_default_constructible<V>::value, "");
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}
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{
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using V = std::variant<NonDefaultConstructible, int>;
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static_assert(!std::is_default_constructible<V>::value, "");
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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_default_constructible<V>::value, "");
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}
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#endif
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}
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void test_default_ctor_noexcept() {
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{
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using V = std::variant<int>;
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static_assert(std::is_nothrow_default_constructible<V>::value, "");
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}
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{
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using V = std::variant<NotNoexcept>;
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static_assert(!std::is_nothrow_default_constructible<V>::value, "");
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}
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}
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void test_default_ctor_throws() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using V = std::variant<DefaultCtorThrows, int>;
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try {
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V v;
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assert(false);
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} catch (const int &ex) {
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assert(ex == 42);
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} catch (...) {
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assert(false);
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}
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#endif
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}
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void test_default_ctor_basic() {
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{
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std::variant<int> v;
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assert(v.index() == 0);
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assert(std::get<0>(v) == 0);
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}
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{
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std::variant<int, long> v;
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assert(v.index() == 0);
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assert(std::get<0>(v) == 0);
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}
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{
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using V = std::variant<int, long>;
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constexpr V v;
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static_assert(v.index() == 0, "");
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static_assert(std::get<0>(v) == 0, "");
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}
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{
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using V = std::variant<int, long>;
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constexpr V v;
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static_assert(v.index() == 0, "");
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static_assert(std::get<0>(v) == 0, "");
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}
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}
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int main() {
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test_default_ctor_basic();
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test_default_ctor_sfinae();
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test_default_ctor_noexcept();
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test_default_ctor_throws();
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}
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