Safe and effective way to put a mutex on a container entry

Question

C++\'s std::mutex does not have a move constructor. There is a good reason for that. Basically, move constructors themselves are not generally thread safe, and

Answer 1

The mutex does not require to be moved:

Imagine that every row in your map is like:

template 
class row
{
    shared_ptr m;
    T data;
    ...
};

So if your row need to be moved or copied, there is no problem.

Then, you may access the mutex from every process to access the data.

Of course, you need a global mutex to perform changes on the whole map: insert / delete / [] / any other operation that change the state of the map.

EDITED:

Following a simple example of code with a mutex in every row. (It does not implement anything else that just the data structure)

#include 
#include