FAQ 12.03 Does C have a counterpart to realloc() that goes along with new and delete ?

FAQ 12.03 Does C++ have a counterpart to realloc() that goes along with new and delete?

No; and don't use realloc() directly, since bitwise copying of an object of a user-defined class is evil.

When realloc() needs to move data during the reallocation, it uses a bitwise copy, which is disastrous for many user-defined classes (see FAQ 30.15). C++ objects know how to copy themselves using their own copy constructors and assignment operators.

Never use realloc() on objects of user-defined classes. Let the objects copy themselves. Better yet, use the vector template class rather than pointers to arrays, and the vector template will take care of reallocation automatically and correctly (see FAQ 28.13).