Using malloc instead of new, and calling the copy constructor when the object is created

Question

I wanted to try out TBB\'s scalable_allocator, but was confused when I had to replace some of my code. This is how allocation is done with the allocator:

Som         


        

Answer 1

Use placement new

#include 
//...
int main()
{
        S* s = (S*) malloc(sizeof(S));
        s = new (s) S();//placement new
        //...
        s->~S();
        free(s);
}