Hello,
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 projet mixing objc and c++ and I am starting to be lost.
Thanks in advance for your help!
+1
A:
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.
GMan
2010-02-17 19:30:58
A:
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.
Tyler McHenry
2010-02-17 19:48:42
If I could mark this answer as not useful with a comment, I would do so because it is incorrect. As GMan said, realloc is found in <cstdlib>.
David Harris
2010-02-17 21:35:04
I did not say that it is not possible to use the C standard library function `realloc` in C++ (since, of course, the C++ standard library includes the entirety of the C89 standard library). I said that there is not a new C++ standard library function that encompasses the functionality of `realloc` as `std::copy` does for `memcpy`. Although I suppose my intent is not obvious if my answer is read in isolation as opposed to in conjunction with the other, already accepted answer.
Tyler McHenry
2010-02-17 21:54:25