[#SpanReader-size]
= xref:SpanReader.adoc[SpanReader]::size
:relfileprefix: ../
:mrdocs:

Return the number of bytes remaining to be read.

== Synopsis

Declared in `<streams.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
size() const;
----

== Return Value

The number of unread bytes.


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