//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <utility>
// template <class T1, class T2> struct pair
// template<class U, class V> pair& operator=(const pair<U, V>& p);
#include <utility>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER >= 11
#include "archetypes.h"
#endif
struct CopyAssignableInt {
CopyAssignableInt& operator=(int&) { return *this; }
};
struct Unrelated {};
TEST_CONSTEXPR_CXX20 bool test() {
{
typedef std::pair<int, short> P1;
typedef std::pair<double, long> P2;
P1 p1(3, static_cast<short>(4));
P2 p2;
p2 = p1;
assert(p2.first == 3);
assert(p2.second == 4);
}
#if TEST_STD_VER >= 20
{
using C = ConstexprTestTypes::TestType;
using P = std::pair<int, C>;
using T = std::pair<long, C>;
const T t(42, -42);
P p(101, 101);
p = t;
assert(p.first == 42);
assert(p.second.value == -42);
}
#elif TEST_STD_VER >= 11
{
using C = TestTypes::TestType;
using P = std::pair<int, C>;
using T = std::pair<long, C>;
const T t(42, -42);
P p(101, 101);
C::reset_constructors();
p = t;
assert(C::constructed == 0);
assert(C::assigned == 1);
assert(C::copy_assigned == 1);
assert(C::move_assigned == 0);
assert(p.first == 42);
assert(p.second.value == -42);
}
{ // test const requirement
using T = std::pair<CopyAssignableInt, CopyAssignableInt>;
using P = std::pair<int, int>;
static_assert(!std::is_assignable<T&, P const>::value, "");
}
{
using T = std::pair<int, Unrelated>;
using P = std::pair<Unrelated, int>;
static_assert(!std::is_assignable<T&, P&>::value, "");
static_assert(!std::is_assignable<P&, T&>::value, "");
}
#endif
#if TEST_STD_VER >= 11 || defined(_LIBCPP_VERSION) // valid in C++11, provided in C++03 with libc++ as an extension
{
int i = 0, j = 0;
std::pair<int&, int&> p(i, j);
const std::pair<const int, const int> from(11, 12);
p = from;
assert(i == 11);
assert(j == 12);
}
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}