Is accessing the raw pointer after std::vector::reserve safe?

Question

This is pretty farfetched, but is the following code \"safe\" (i.e. guaranteed not to cause segmentation fault):

std::vector vec(1); // Ensures th         


        

Answer 1

Vector-reallocation invalidates existing pointers, references etc. Reserve could trigger a reallocation (23.3.6.2, [vector.capacity]) but you are taking the address of the first element after the eventual reallocation (which in this case will not probably happen at all, but that's besides the point). So I see no problem with the code.