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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, class V> EXPLICIT constexpr pair(const pair<U, V>& p);
#include <utility>
#include <cassert>
#include "archetypes.h"
#include "test_convertible.h"
#include "test_macros.h"
using namespace ImplicitTypes; // Get implicitly archetypes
template <class T1, class U1, bool CanCopy = true, bool CanConvert = CanCopy>
TEST_CONSTEXPR_CXX20 void test_pair_const() {
using P1 = std::pair<T1, int>;
using P2 = std::pair<int, T1>;
using UP1 = std::pair<U1, int> const&;
using UP2 = std::pair<int, U1> const&;
static_assert(std::is_constructible<P1, UP1>::value == CanCopy, "");
static_assert(test_convertible<P1, UP1>() == CanConvert, "");
static_assert(std::is_constructible<P2, UP2>::value == CanCopy, "");
static_assert(test_convertible<P2, UP2>() == CanConvert, "");
}
template <class T, class U>
struct DPair : public std::pair<T, U> {
using Base = std::pair<T, U>;
using Base::Base;
};
struct ExplicitT {
constexpr explicit ExplicitT(int x) : value(x) {}
constexpr explicit ExplicitT(ExplicitT const& o) : value(o.value) {}
int value;
};
struct ImplicitT {
constexpr ImplicitT(int x) : value(x) {}
constexpr ImplicitT(ImplicitT const& o) : value(o.value) {}
int value;
};
TEST_CONSTEXPR_CXX20 bool test() {
{
typedef std::pair<int, int> P1;
typedef std::pair<double, long> P2;
const P1 p1(3, 4);
const P2 p2 = p1;
assert(p2.first == 3);
assert(p2.second == 4);
}
{
// We allow derived types to use this constructor
using P1 = DPair<long, long>;
using P2 = std::pair<int, int>;
P1 p1(42, 101);
P2 p2(p1);
assert(p2.first == 42);
assert(p2.second == 101);
}
{
test_pair_const<AllCtors, AllCtors>(); // copy construction
test_pair_const<AllCtors, AllCtors&>();
test_pair_const<AllCtors, AllCtors&&>();
test_pair_const<AllCtors, const AllCtors&>();
test_pair_const<AllCtors, const AllCtors&&>();
test_pair_const<ExplicitTypes::AllCtors,
ExplicitTypes::AllCtors>(); // copy construction
test_pair_const<ExplicitTypes::AllCtors, ExplicitTypes::AllCtors&, true,
false>();
test_pair_const<ExplicitTypes::AllCtors, ExplicitTypes::AllCtors&&, true,
false>();
test_pair_const<ExplicitTypes::AllCtors, const ExplicitTypes::AllCtors&,
true, false>();
test_pair_const<ExplicitTypes::AllCtors, const ExplicitTypes::AllCtors&&,
true, false>();
test_pair_const<MoveOnly, MoveOnly, false>(); // copy construction
test_pair_const<MoveOnly, MoveOnly&, false>();
test_pair_const<MoveOnly, MoveOnly&&, false>();
test_pair_const<ExplicitTypes::MoveOnly, ExplicitTypes::MoveOnly,
false>(); // copy construction
test_pair_const<ExplicitTypes::MoveOnly, ExplicitTypes::MoveOnly&, false>();
test_pair_const<ExplicitTypes::MoveOnly, ExplicitTypes::MoveOnly&&,
false>();
test_pair_const<CopyOnly, CopyOnly>();
test_pair_const<CopyOnly, CopyOnly&>();
test_pair_const<CopyOnly, CopyOnly&&>();
test_pair_const<ExplicitTypes::CopyOnly, ExplicitTypes::CopyOnly>();
test_pair_const<ExplicitTypes::CopyOnly, ExplicitTypes::CopyOnly&, true,
false>();
test_pair_const<ExplicitTypes::CopyOnly, ExplicitTypes::CopyOnly&&, true,
false>();
test_pair_const<NonCopyable, NonCopyable, false>();
test_pair_const<NonCopyable, NonCopyable&, false>();
test_pair_const<NonCopyable, NonCopyable&&, false>();
test_pair_const<NonCopyable, const NonCopyable&, false>();
test_pair_const<NonCopyable, const NonCopyable&&, false>();
}
{ // Test construction of references
test_pair_const<NonCopyable&, NonCopyable&>();
test_pair_const<NonCopyable&, NonCopyable&&>();
test_pair_const<NonCopyable&, NonCopyable const&, false>();
test_pair_const<NonCopyable const&, NonCopyable&&>();
test_pair_const<NonCopyable&&, NonCopyable&&, false>();
test_pair_const<ConvertingType&, int, false>();
test_pair_const<ExplicitTypes::ConvertingType&, int, false>();
// Unfortunately the below conversions are allowed and create dangling
// references.
//test_pair_const<ConvertingType&&, int>();
//test_pair_const<ConvertingType const&, int>();
//test_pair_const<ConvertingType const&&, int>();
// But these are not because the converting constructor is explicit.
test_pair_const<ExplicitTypes::ConvertingType&&, int, false>();
test_pair_const<ExplicitTypes::ConvertingType const&, int, false>();
test_pair_const<ExplicitTypes::ConvertingType const&&, int, false>();
}
{
test_pair_const<AllCtors, int, false>();
test_pair_const<ExplicitTypes::AllCtors, int, false>();
test_pair_const<ConvertingType, int>();
test_pair_const<ExplicitTypes::ConvertingType, int, true, false>();
test_pair_const<ConvertingType, int>();
test_pair_const<ConvertingType, ConvertingType>();
test_pair_const<ConvertingType, ConvertingType const&>();
test_pair_const<ConvertingType, ConvertingType&>();
test_pair_const<ConvertingType, ConvertingType&&>();
test_pair_const<ExplicitTypes::ConvertingType, int, true, false>();
test_pair_const<ExplicitTypes::ConvertingType, int&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType, const int&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType, int&&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType, const int&&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType,
ExplicitTypes::ConvertingType>();
test_pair_const<ExplicitTypes::ConvertingType,
ExplicitTypes::ConvertingType const&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType,
ExplicitTypes::ConvertingType&, true, false>();
test_pair_const<ExplicitTypes::ConvertingType,
ExplicitTypes::ConvertingType&&, true, false>();
}
#if TEST_STD_VER > 11
{
typedef std::pair<int, int> P1;
typedef std::pair<double, long> P2;
constexpr P1 p1(3, 4);
constexpr P2 p2 = p1;
static_assert(p2.first == 3, "");
static_assert(p2.second == 4, "");
}
{
using P1 = std::pair<int, int>;
using P2 = std::pair<ExplicitT, ExplicitT>;
constexpr P1 p1(42, 101);
constexpr P2 p2(p1);
static_assert(p2.first.value == 42, "");
static_assert(p2.second.value == 101, "");
}
{
using P1 = std::pair<int, int>;
using P2 = std::pair<ImplicitT, ImplicitT>;
constexpr P1 p1(42, 101);
constexpr P2 p2 = p1;
static_assert(p2.first.value == 42, "");
static_assert(p2.second.value == 101, "");
}
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}
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