swap (C++ Standard Library)
Swap two shared_ptr or weak_ptr objects.
template<class Ty, class Other>
void swap(shared_ptr<Ty>& left, shared_ptr<Other>& right);
template<class Ty, class Other>
void swap(weak_ptr<Ty>& left, weak_ptr<Other>& right);
Parameters
Ty
The type controlled by the left shared/weak pointer.Other
The type controlled by the right shared/weak pointer.left
The left shared/weak pointer.right
The right shared/weak pointer.
Remarks
The template functions call left.swap(right).
Example
// std_tr1__memory__swap.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
struct deleter
{
void operator()(int *p)
{
delete p;
}
};
int main()
{
std::shared_ptr<int> sp1(new int(5));
std::shared_ptr<int> sp2(new int(10));
std::cout << "*sp1 == " << *sp1 << std::endl;
sp1.swap(sp2);
std::cout << "*sp1 == " << *sp1 << std::endl;
swap(sp1, sp2);
std::cout << "*sp1 == " << *sp1 << std::endl;
std::cout << std::endl;
std::weak_ptr<int> wp1(sp1);
std::weak_ptr<int> wp2(sp2);
std::cout << "*wp1 == " << *wp1.lock() << std::endl;
wp1.swap(wp2);
std::cout << "*wp1 == " << *wp1.lock() << std::endl;
swap(wp1, wp2);
std::cout << "*wp1 == " << *wp1.lock() << std::endl;
return (0);
}
*sp1 == 5 *sp1 == 10 *sp1 == 5 *wp1 == 5 *wp1 == 10 *wp1 == 5
Requirements
Header: <memory>
Namespace: std