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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 ob-
     ject, i.e.
	whether use_count() == 1.

Parameters
	(none)

Return value
	true  if  *this is the only shared_ptr instance managing the current ob-
     ject, 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 <iostream>
      #include <memory>

      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 	   2024.06.10	      std::shared_ptr::unique(3)
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