[#DataStream-begin-0a]
= xref:DataStream.adoc[DataStream]::begin
:relfileprefix: ../
:mrdocs:

Return a const iterator to the first unread element.

== Synopsis

Declared in `<streams.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:DataStream/const_iterator.adoc[const_iterator]
begin() const;
----

== Return Value

A const iterator to the first unread element.


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