deduction guides for std::weak_ptr
From cppreference.com
C++
Utilities library
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Dynamic memory management
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std::weak_ptr
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(C++20) | ||||
Deduction guides(C++17) |
Defined in header <memory>
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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 }