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# PR_DELETE (Deprecated)
Allocates memory of a specified size from the heap.
## Syntax
```{code}
#include <prmem.h>
void PR_DELETE(_ptr);
```
### Parameter
`_ptr`
: The address of memory to be returned to the heap. Must be an lvalue
(an expression that can appear on the left side of an assignment
statement).
### Returns
Nothing.
## Description
This macro returns allocated memory to the heap from the specified
location and sets `_ptr` to `NULL`.