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# nng_aio_set_output
## NAME
nng_aio_set_output --- set output result
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_aio_set_output(nng_aio *aio, unsigned int index, void *result);
```
## DESCRIPTION
The `nng_aio_set_output()` function sets the output result at _index_
to _result_ for the asynchronous operation associated with _aio_.
The type and semantics of output results are determined by specific
operations; the operation must supply appropriate output results when
the operation completes successfully.
The valid values of _index_ range from zero (0) to three (3), as no operation
currently defined can return more than four results.
> [!NOTE]
> Note that attempts to set results with an _index_ greater than
> three (3) will be ignored.
An output result set with this function may be retrieved later with
the [`nng_aio_get_output()`][nng_aio_get_output] function.
## SEE ALSO
[nng_aio_get_output][nng_aio_get_output]
{{#include ../refs.md}}
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