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# nng_free
## NAME
nng_free --- free memory
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_free(void *ptr, size_t size);
```
## DESCRIPTION
The `nng_free()` function deallocates a memory region of size _size_,
that was previously allocated by [`nng_alloc()`][nng_alloc] or
[`nng_recv()`](../socket/nng_recv.md) with the `NNG_FLAG_ALLOC` flag.
> [!IMPORTANT]
> It is very important that _size_ match the allocation size
> used to allocate the memory.
> [!IMPORTANT]
> Do not attempt to use this function to deallocate memory
> obtained by a call to the system `malloc()` or `calloc()` functions,
> or the C++ `new` operator.
> Doing so may result in unpredictable
> behavior, including corruption of application memory.
## SEE ALSO
[nng_alloc][nng_alloc],
[nng_recv](../socket/nng_recv.md)
{{#include ../refs.md}}
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