[#BloombergLP-bdlde-Utf8CheckingInStreamBufWrapper-showmanyc]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlde.adoc[bdlde]::xref:BloombergLP/bdlde/Utf8CheckingInStreamBufWrapper.adoc[Utf8CheckingInStreamBufWrapper]::showmanyc
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Return the number of bytes that are guaranteed that can be read before `underflow` returns `eof`. If the object is not in a valid state, ‐1 will be returned. Note that often, the actual number of bytes that can be read will be much greater than the value returned by this function.

== Synopsis

Declared in `<bdlde_utf8checkinginstreambufwrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
showmanyc() override;
----


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