W3cubDocs

/C++

std::shared_ptr::unique

bool unique() const;

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.

Exceptions

noexcept specification:
noexcept

Example

#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 object
(public member function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/memory/shared_ptr/unique