deduction guides for std::weak_ptr - cppreference.com
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    deduction guides for std::weak_ptr

    From cppreference.com
     
    C++
     
    Memory management library
    Allocators
    (C++17)
    (C++20)
    Memory resources
    Uninitialized storage (until C++20*)
    Garbage collector support (until C++23)
     
    std::weak_ptr
     

    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
}