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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <memory>
// shared_ptr
// template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b);
#include <memory>
#include <cassert>
#include "test_macros.h"
struct A
{
static int count;
A() {++count;}
A(const A&) {++count;}
~A() {--count;}
};
int A::count = 0;
int main(int, char**)
{
{
A* ptr1 = new A;
A* ptr2 = new A;
std::shared_ptr<A> p1(ptr1);
{
std::shared_ptr<A> p2(ptr2);
swap(p1, p2);
assert(p1.use_count() == 1);
assert(p1.get() == ptr2);
assert(p2.use_count() == 1);
assert(p2.get() == ptr1);
assert(A::count == 2);
}
assert(p1.use_count() == 1);
assert(p1.get() == ptr2);
assert(A::count == 1);
}
assert(A::count == 0);
{
A* ptr1 = new A;
A* ptr2 = 0;
std::shared_ptr<A> p1(ptr1);
{
std::shared_ptr<A> p2;
swap(p1, p2);
assert(p1.use_count() == 0);
assert(p1.get() == ptr2);
assert(p2.use_count() == 1);
assert(p2.get() == ptr1);
assert(A::count == 1);
}
assert(p1.use_count() == 0);
assert(p1.get() == ptr2);
assert(A::count == 0);
}
assert(A::count == 0);
{
A* ptr1 = 0;
A* ptr2 = new A;
std::shared_ptr<A> p1;
{
std::shared_ptr<A> p2(ptr2);
swap(p1, p2);
assert(p1.use_count() == 1);
assert(p1.get() == ptr2);
assert(p2.use_count() == 0);
assert(p2.get() == ptr1);
assert(A::count == 1);
}
assert(p1.use_count() == 1);
assert(p1.get() == ptr2);
assert(A::count == 1);
}
assert(A::count == 0);
{
A* ptr1 = 0;
A* ptr2 = 0;
std::shared_ptr<A> p1;
{
std::shared_ptr<A> p2;
swap(p1, p2);
assert(p1.use_count() == 0);
assert(p1.get() == ptr2);
assert(p2.use_count() == 0);
assert(p2.get() == ptr1);
assert(A::count == 0);
}
assert(p1.use_count() == 0);
assert(p1.get() == ptr2);
assert(A::count == 0);
}
assert(A::count == 0);
return 0;
}
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