Converting between vectors with different allocators

Question

I have written a simple C++11 style stateful allocator type. Given

template class my_allocator {
   // the usual stuff
};

template

        

Answer 1

There are 3 solutions to your problem:

I. If your vector 'y' does not exist yet, you could use :

std::vector y(x.begin(), x.end());

II. If your vector 'y' already exist, you could use : (e.g. for a member of a class)

this->y.assign(x.begin(), x.end());

These 2 ways to fill a vector are not looking the container type. (and therefore the allocator type)

III. Another solution is to create a parent class which could be used as an allocator adapter between the std allocator and your own allocator. In this case, your 2 allocators are of the same type, and could be used with vector methods like operator=().