What special purpose does a unique block using a mutex have?

Question

I'm not quite sure why it std::unique_lock<std::mutex>is only useful when using regular locking. An example of the code I'm looking for is:

{//aquire lock

        std::unique_lock<std::mutex> lock(queue_mutex);

        //add task
        tasks.push_back(std::function<void()>(f));

}//release lock

why would it prefer more

queue_mutex.lock();

//add task
//...

queue_mutex.unlock();

do these code snippets do the same thing?

Answer 1

[Do] do these pieces of code do the same thing?

No.

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Answer 2

unique_lock .

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