std::unique_lock<Mutex>::swap

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< cpp‎ | thread‎ | unique lock
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std::unique_lock
void swap( unique_lock& other ) noexcept;
(since C++11)

Exchanges the internal states of the lock objects.

Parameters

other - the lock to swap the state with

Return value

(none)

Example

Run this code
#include <iostream>
#include <mutex>
 
int main()
{
    std::mutex mtx1;
    std::unique_lock<std::mutex> guard1(mtx1);
    std::unique_lock<std::mutex> guard2;
    guard2.swap(guard1);
 
    if (!guard1 && guard2)
        std::cout << "swapped success\n";
 
    return 0;
}

Output: 

swapped success

See also

(C++11)
 specializes the std::swap algorithm
(function template)
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