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      deduction guides forstd::weak_ptr

      From cppreference.com
      <cpp‎ |memory‎ |weak ptr
       
       
      Memory management library
      (exposition only*)
      Allocators
      Uninitialized memory algorithms
      Constrained uninitialized memory algorithms
      Memory resources
      Uninitialized storage(until C++20)
      (until C++20*)
      (until C++20*)
      Garbage collector support(until C++23)
      (C++11)(until C++23)
      (C++11)(until C++23)
      (C++11)(until C++23)
      (C++11)(until C++23)
      (C++11)(until C++23)
      (C++11)(until C++23)
       
       
      Defined in header<memory>
      template<class T>
      weak_ptr(std::shared_ptr<T>)-> weak_ptr<T>;
      		(since C++17)

      Onededuction guide is provided forstd::weak_ptr to account for the edge case missed by the implicit deduction guides.

      [edit]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}
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/memory/weak_ptr/deduction_guides&oldid=160322"
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