Realloc() question

Applications Programming
1

b = realloc(a, 1000);

if realloc succeeds and b!=a (not in-place replacement), does realloc automatically free a or I should free both a and b afterwards?

thank you!

2

If realloc succeeds, you don't need to free a, just b.

3

surely, but i just want to know what happens with a.a gets freed automatically after realloc succeeds? i didnt find this information anywhere and I was just curious...

4

If it has to move the memory, the original memory block will be freed for you.

5

thank you very much!

6

Note that with the null pointer behavior of realloc, you do not need malloc. This can make for a very clean loop to create and resize a buffer.

Just be careful who you share the a pointer value with if you plan to realloc, this is not JAVA!