| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03 |
| |
| // <utility> |
| |
| // template <class T1, class T2> struct pair |
| |
| // template<class U = T1, class V = T2> pair(U&&, V&&); |
| |
| #include <utility> |
| #include <cassert> |
| #include <memory> |
| |
| #include "archetypes.h" |
| #include "test_convertible.h" |
| |
| #include "test_macros.h" |
| using namespace ImplicitTypes; // Get implicitly archetypes |
| |
| template <class T1, class T1Arg, |
| bool CanCopy = true, bool CanConvert = CanCopy> |
| void test_sfinae() { |
| using P1 = std::pair<T1, int>; |
| using P2 = std::pair<int, T1>; |
| using T2 = int const&; |
| static_assert(std::is_constructible<P1, T1Arg, T2>::value == CanCopy, ""); |
| static_assert(test_convertible<P1, T1Arg, T2>() == CanConvert, ""); |
| static_assert(std::is_constructible<P2, T2, T1Arg>::value == CanCopy, ""); |
| static_assert(test_convertible<P2, T2, T1Arg>() == CanConvert, ""); |
| } |
| |
| struct ExplicitT { |
| constexpr explicit ExplicitT(int x) : value(x) {} |
| int value; |
| }; |
| |
| struct ImplicitT { |
| constexpr ImplicitT(int x) : value(x) {} |
| int value; |
| }; |
| |
| int main(int, char**) |
| { |
| { |
| typedef std::pair<std::unique_ptr<int>, short*> P; |
| P p(std::unique_ptr<int>(new int(3)), nullptr); |
| assert(*p.first == 3); |
| assert(p.second == nullptr); |
| } |
| { |
| // Test non-const lvalue and rvalue types |
| test_sfinae<AllCtors, AllCtors&>(); |
| test_sfinae<AllCtors, AllCtors&&>(); |
| test_sfinae<ExplicitTypes::AllCtors, ExplicitTypes::AllCtors&, true, false>(); |
| test_sfinae<ExplicitTypes::AllCtors, ExplicitTypes::AllCtors&&, true, false>(); |
| test_sfinae<CopyOnly, CopyOnly&>(); |
| test_sfinae<CopyOnly, CopyOnly&&>(); |
| test_sfinae<ExplicitTypes::CopyOnly, ExplicitTypes::CopyOnly&, true, false>(); |
| test_sfinae<ExplicitTypes::CopyOnly, ExplicitTypes::CopyOnly&&, true, false>(); |
| test_sfinae<MoveOnly, MoveOnly&, false>(); |
| test_sfinae<MoveOnly, MoveOnly&&>(); |
| test_sfinae<ExplicitTypes::MoveOnly, ExplicitTypes::MoveOnly&, false>(); |
| test_sfinae<ExplicitTypes::MoveOnly, ExplicitTypes::MoveOnly&&, true, false>(); |
| test_sfinae<NonCopyable, NonCopyable&, false>(); |
| test_sfinae<NonCopyable, NonCopyable&&, false>(); |
| test_sfinae<ExplicitTypes::NonCopyable, ExplicitTypes::NonCopyable&, false>(); |
| test_sfinae<ExplicitTypes::NonCopyable, ExplicitTypes::NonCopyable&&, false>(); |
| } |
| { |
| // Test converting types |
| test_sfinae<ConvertingType, int&>(); |
| test_sfinae<ConvertingType, const int&>(); |
| test_sfinae<ConvertingType, int&&>(); |
| test_sfinae<ConvertingType, const int&&>(); |
| test_sfinae<ExplicitTypes::ConvertingType, int&, true, false>(); |
| test_sfinae<ExplicitTypes::ConvertingType, const int&, true, false>(); |
| test_sfinae<ExplicitTypes::ConvertingType, int&&, true, false>(); |
| test_sfinae<ExplicitTypes::ConvertingType, const int&&, true, false>(); |
| } |
| #if TEST_STD_VER > 11 |
| { // explicit constexpr test |
| constexpr std::pair<ExplicitT, ExplicitT> p(42, 43); |
| static_assert(p.first.value == 42, ""); |
| static_assert(p.second.value == 43, ""); |
| } |
| { // implicit constexpr test |
| constexpr std::pair<ImplicitT, ImplicitT> p = {42, 43}; |
| static_assert(p.first.value == 42, ""); |
| static_assert(p.second.value == 43, ""); |
| } |
| #endif |
| |
| // Test support for http://wg21.link/P1951, default arguments for pair's constructor. |
| // Basically, this turns copies for brace initialization into moves. |
| #if TEST_STD_VER > 20 |
| { |
| struct TrackInit { |
| TrackInit() = default; |
| constexpr TrackInit(TrackInit const& other) : wasMoveInit(other.wasMoveInit), wasCopyInit(true) { } |
| constexpr TrackInit(TrackInit&& other) : wasMoveInit(true), wasCopyInit(other.wasCopyInit) { } |
| bool wasMoveInit = false; |
| bool wasCopyInit = false; |
| }; |
| |
| // Explicit constructor |
| { |
| { |
| std::pair<TrackInit, int> p({}, 3); |
| assert( p.first.wasMoveInit); |
| assert(!p.first.wasCopyInit); |
| } |
| { |
| std::pair<int, TrackInit> p(3, {}); |
| assert( p.second.wasMoveInit); |
| assert(!p.second.wasCopyInit); |
| } |
| } |
| |
| // Implicit constructor |
| { |
| { |
| std::pair<TrackInit, int> p = {{}, 3}; |
| assert( p.first.wasMoveInit); |
| assert(!p.first.wasCopyInit); |
| } |
| { |
| std::pair<int, TrackInit> p = {3, {}}; |
| assert( p.second.wasMoveInit); |
| assert(!p.second.wasCopyInit); |
| } |
| } |
| } |
| #endif // TEST_STD_VER > 20 |
| |
| return 0; |
| } |