The main issue is that you can't say to realloc "if you can't expand in place, just leave it" This is occasionally annoying in C, but not a great issue. In C++

The main issue is that you can't say to realloc "if you can't expand in place, just leave it" This is occasionally annoying in C, but not a great issue. In C++, just memcpying classes leads to awful things happening.