C++ Programming/Code/Standard C Library/Memory

Standard C Memory Management

This section will cover memory management elements from the Standard C Library.

calloc

Syntax

#include <cstdlib> void *calloc( size_t num, size_t size);

The function calloc() allocates a block of memory that can store num objects of size size. In addition, the block of memory allocated is set to all zeros.

If the operation fails, calloc() returns NULL.

Related topics

free - malloc - realloc

free

Syntax

#include <cstdlib> void free( void *p);

The function free() releases a previously allocated block from a call to calloc, malloc, or realloc.

Related topics

calloc - malloc - realloc

malloc

Syntax

#include <cstdlib> void *malloc( size_t s );

The function malloc() allocates a block of memory of size s. The memory remains uninitialized.

If the operation fails, malloc() returns NULL.

Related topics

calloc - free - realloc

realloc

Syntax

#include <cstdlib> void *realloc( void *p, size_t s);

The function realloc() resizes a block created by malloc() or calloc(), and returns a pointer to the new memory region.

If the resize operation fails, realloc() returns NULL and leaves the old memory region intact.

Related topics

calloc - free - malloc