What is C++ version of realloc(), to allocate the new buffer and copy the contents from the old one?

Question

In C we used malloc(), free(), but in C++ youare using new, delete, but in C we also have realloc, which will alloc the new block and

Answer 1

C++ doesn't have a new/delete equivalent of C's realloc.

The probable reason (although it is not mentioned anywhere in the Standard) is because of constructors that can throw: how should it behave if, while reallocating, a constructor throws? The handling of this case is best left to the programmer because there is not one true answer.