What header should I include for memcpy and realloc?

问题

I am porting a project to the iPhone and it uses realloc and memcpy which are not found. What is the header to include?

It's a project mixing Objective C and C++ and I am starting to be lost.

Thanks in advance for your help!

回答1:

In C:

#include <string.h> // memcpy
#include <stdlib.h> //realloc

In C++, remove the .h and prefix with a c. In C++, they will be placed in the std namespace, but are also global.

回答2:

In C++ it's more idiomatic to use std::copy than C's memcpy, although the latter does work just as well. To get std::copy, you need to #include <algorithm>.

There's not a direct C++ equivalent to realloc, though.

来源：https://stackoverflow.com/questions/2283712/what-header-should-i-include-for-memcpy-and-realloc