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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
//
//===----------------------------------------------------------------------===//
// <memory>
// shared_ptr
// template<class Y> shared_ptr(const shared_ptr<Y>& r, T *p);
#include <memory>
#include <cassert>
#include <utility>
#include "test_macros.h"
struct B
{
static int count;
B() {++count;}
B(const B&) {++count;}
~B() {--count;}
};
int B::count = 0;
struct A
{
static int count;
A() {++count;}
A(const A&) {++count;}
~A() {--count;}
};
int A::count = 0;
int main(int, char**)
{
{
std::shared_ptr<A> pA(new A);
assert(pA.use_count() == 1);
{
B b;
std::shared_ptr<B> pB(pA, &b);
assert(A::count == 1);
assert(B::count == 1);
assert(pA.use_count() == 2);
assert(pB.use_count() == 2);
assert(pB.get() == &b);
}
assert(pA.use_count() == 1);
assert(A::count == 1);
assert(B::count == 0);
}
assert(A::count == 0);
assert(B::count == 0);
{
std::shared_ptr<A const> pA(new A);
assert(pA.use_count() == 1);
{
B const b;
std::shared_ptr<B const> pB(pA, &b);
assert(A::count == 1);
assert(B::count == 1);
assert(pA.use_count() == 2);
assert(pB.use_count() == 2);
assert(pB.get() == &b);
}
assert(pA.use_count() == 1);
assert(A::count == 1);
assert(B::count == 0);
}
assert(A::count == 0);
assert(B::count == 0);
int *pi = new int;
{
std::shared_ptr<int> p1(nullptr);
std::shared_ptr<int> p2(p1, pi);
assert(p2.get() == pi);
}
delete pi;
{
std::shared_ptr<int> p1(new int);
std::shared_ptr<int> p2(p1, nullptr);
assert(p2.get() == nullptr);
}
#if TEST_STD_VER > 17 && defined(_LIBCPP_VERSION)
{
std::shared_ptr<A> pA(new A);
assert(pA.use_count() == 1);
# if TEST_STD_VER >= 20
// LWG-2996 is only implemented in c++20 and beyond.
// We don't backport because it is an evolutionary change.
{
B b;
std::shared_ptr<B> pB(std::move(pA), &b);
assert(A::count == 1);
assert(B::count == 1);
assert(pA.use_count() == 0);
assert(pB.use_count() == 1);
assert(pB.get() == &b);
}
# endif // TEST_STD_VER > 20
}
assert(A::count == 0);
assert(B::count == 0);
#endif
return 0;
}
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