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# std::shared_ptr::unique

From cppreference.com
< cpp‎ | memory‎ | shared ptr

bool unique() const; |  |

Checks if *this is the only `shared_ptr` instance managing the current object, i.e. whether use_count() == 1.

### [edit] Parameters

(none)

### [edit] Return value

true if *this is the only `shared_ptr` instance managing the current object, false otherwise.

### [edit] Example

Run this code

    #include <memory>
    #include <iostream>

    int main()
    {
        std::shared_ptr<int> sp1 {std::make_shared<int>(5)};
        std::cout << "sp1.unique() == " << std::boolalpha << sp1.unique() << std::endl;

        std::shared_ptr<int> sp2 {sp1};
        std::cout << "sp1.unique() == " << std::boolalpha << sp1.unique() << std::endl;
    }

Output:

    sp1.unique() == true
    sp1.unique() == false

### [edit] See also

use_count | returns the number of `shared_ptr` objects referring to the same managed object (public member function) [edit]

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