How to use a std::mutex in a class context

Question

i\'m having some trouble using a C++11 std::mutex

in my class I have a variable called semaphore of type std::mutex.

So I positioned my semaphore.lock() and sema

Answer 1

Declare your mutex dynamically and not statically.

At your Database class header declare the mutex as a pointer, like that:

mutex * semaphore;

and at your constructor initialize the mutex calling his constructor:

semaphore = new std::mutex();