[#VectorWriter-2constructor-04]
= xref:VectorWriter.adoc[VectorWriter]::VectorWriter
:relfileprefix: ../
:mrdocs:

Construct a writer that overwrites and/or appends to an existing byte vector.

== Synopsis

Declared in `<streams.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
VectorWriter(
    std::vector<unsigned char>& vchDataIn,
    size_t nPosIn);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *vchDataIn*
| Referenced byte vector to overwrite/append.
| *nPosIn*
| Starting position; vector index where writes should start. The vector will initially grow as necessary to max(nPosIn, vec.size()). So to append, use vec.size().
|===


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