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std::shared_ptr::unique(3) C++ Standard Libary std::shared_ptr::unique(3) NAME std::shared_ptr::unique - std::shared_ptr::unique Synopsis bool unique() const noexcept; (deprecated in C++17) (removed in C++20) Checks if *this is the only shared_ptr instance managing the current object, i.e. whether use_count() == 1. Parameters (none) Return value true if *this is the only shared_ptr instance managing the current object, false otherwise. Notes This function was deprecated in C++17 and removed in C++20 because use_count is only an approximation in multithreaded environment (see Notes in use_count). Example // Run this code #include <memory> #include <iostream> int main() { auto sp1 = std::make_shared<int>(5); std::cout << std::boolalpha; std::cout << "sp1.unique() == " << sp1.unique() << '\n'; std::shared_ptr<int> sp2 = sp1; std::cout << "sp1.unique() == " << sp1.unique() << '\n'; } Output: sp1.unique() == true sp1.unique() == false See also returns the number of shared_ptr objects referring to the same managed use_count object (public member function) http://cppreference.com 2022.07.31 std::shared_ptr::unique(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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