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//===----------------------------------------------------------------------===//
//
// 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;
}
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