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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
//
//===----------------------------------------------------------------------===//
// REQUIRES: 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"
struct NonAssignable {
NonAssignable() {}
private:
NonAssignable& operator=(NonAssignable const&);
};
struct Incomplete;
extern Incomplete inc_obj;
struct ConstructibleFromInt {
ConstructibleFromInt() : value(-1) { }
explicit ConstructibleFromInt(int v) : value(v) { }
int value;
};
int main(int, char**)
{
{
// Test that we don't constrain the assignment operator in C++03 mode.
// Since we don't have access control SFINAE having pair evaluate SFINAE
// may cause a hard error.
typedef std::pair<int, NonAssignable> P;
static_assert(std::is_copy_assignable<P>::value, "");
}
{
typedef std::pair<int, Incomplete&> P;
static_assert(std::is_copy_assignable<P>::value, "");
P p(42, inc_obj);
assert(&p.second == &inc_obj);
}
{
// The type is constructible from int, but not assignable from int.
// This ensures that operator=(pair const&) can be used in conjunction with
// pair(pair<U, V> const&) to mimic operator=(pair<U, V> const&) in C++03.
// This is weird but valid in C++03.
std::pair<ConstructibleFromInt, char> p;
std::pair<int, char> from(11, 'x');
p = from;
assert(p.first.value == 11);
assert(p.second == 'x');
}
return 0;
}
struct Incomplete {};
Incomplete inc_obj;
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