allocator_demp.cpp

#include <vector>

void * mem_pool_ptr;

template<typename type>
struct MyAlloc : allocator<type> 
{
    type* allocate(size_t size)
    {
        cout << "Allocate function called with size " << size << endl;
        return new(mem_pool_ptr) type[size];
    }   

    template <typename U> struct rebind
    {   
        typedef MyAlloc<U> other;
    };  
};

int main()
{
    vector<int, MyAlloc<int>> v1(7,7);
    // ...
    v1.push_back(3);
}