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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
// pair& operator=(pair const& p);
#include <utility>
#include <memory>
#include <cassert>
#include "test_macros.h"
#include "archetypes.h"
struct CountAssign {
int copied = 0;
int moved = 0;
TEST_CONSTEXPR_CXX20 CountAssign() = default;
TEST_CONSTEXPR_CXX20 CountAssign& operator=(CountAssign const&) {
++copied;
return *this;
}
TEST_CONSTEXPR_CXX20 CountAssign& operator=(CountAssign&&) {
++moved;
return *this;
}
};
struct Incomplete;
extern Incomplete inc_obj;
TEST_CONSTEXPR_CXX20 bool test() {
{
typedef std::pair<ConstexprTestTypes::CopyOnly, int> P;
const P p1(ConstexprTestTypes::CopyOnly(), short{4});
P p2;
p2 = p1;
assert(p2.second == 4);
}
{
using P = std::pair<int&, int&&>;
int x = 42;
int y = 101;
int x2 = -1;
int y2 = 300;
P p1(x, std::move(y));
P p2(x2, std::move(y2));
p1 = p2;
assert(p1.first == x2);
assert(p1.second == y2);
}
{
using P = std::pair<int, ConstexprTestTypes::NonCopyable>;
static_assert(!std::is_copy_assignable<P>::value, "");
}
{
using P = std::pair<CountAssign, ConstexprTestTypes::Copyable>;
static_assert(std::is_copy_assignable<P>::value, "");
P p;
P p2;
p = p2;
assert(p.first.copied == 1);
assert(p.first.moved == 0);
assert(p2.first.copied == 0);
assert(p2.first.moved == 0);
}
{
using P = std::pair<int, ConstexprTestTypes::MoveAssignOnly>;
static_assert(!std::is_copy_assignable<P>::value, "");
}
{
using P = std::pair<int, std::unique_ptr<int> >;
static_assert(!std::is_copy_assignable<P>::value, "");
}
{
using P = std::pair<int, Incomplete&>;
static_assert(!std::is_copy_assignable<P>::value, "");
P p(42, inc_obj);
assert(&p.second == &inc_obj);
}
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}
struct Incomplete {};
Incomplete inc_obj;
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