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## 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 xref:nng_alloc.adoc[`nng_alloc`] or xref:nng_recv.adoc[`nng_recv`] 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 {cpp} `new` operator.
Doing so may result in unpredictable behavior, including corruption of application memory.
### See Also
xref:nng_alloc.adoc[nng_alloc],
xref:nng_recv.adoc[nng_recv]
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