deductiongu...::shared_ptr(3) C++ Standard Libary deductiongu...::shared_ptr(3) NAME deductionguidesforstd::shared_ptr - deductionguidesforstd::shared_ptr Synopsis Defined in header <memory> template< class T > (1) (since C++17) shared_ptr( std::weak_ptr<T> ) -> shared_ptr<T>; template< class T, class D > (2) (since C++17) shared_ptr( std::unique_ptr<T, D> ) -> shared_ptr<T>; These deduction guides are provided for std::shared_ptr to account for the edge cases missed by the implicit deduction guides. Note that there is no class template argument deduction from pointer types because it is impossible to distinguish pointers obtained from array and non-ar- ray forms of new. 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 std::shared_ptr p2{w}; // explicit deduction guide is used in this case } http://cppreference.com 2024.06.10 deductiongu...::shared_ptr(3)
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