deduction guides for std::weak_ptr
From cppreference.com
| Defined in header <memory>
|
||
template< class T >
weak_ptr( std::shared_ptr<T> ) -> weak_ptr<T>;
|
(since C++17) | |
One deduction guide is provided for std::weak_ptr to account for the edge case missed by the implicit deduction guides.
Example
Run this code
#include <memory>
int main()
{
auto p = std::make_shared<int>(42);
std::weak_ptr w{p}; // explicit deduction guide is used in this case
}