[#BloombergLP-bslx-TestOutStream-makeNextInvalid]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslx.adoc[bslx]::xref:BloombergLP/bslx/TestOutStream.adoc[TestOutStream]::makeNextInvalid
:relfileprefix: ../../../
:mrdocs:

Make the next output operation emit the invalid data indicator&period;

== Synopsis

Declared in `&lt;bslx&lowbar;testoutstream&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
makeNextInvalid();
----

== Description

Make the next output operation externalize the invalid data indicator, as opposed to the actual type indicator, to this output stream&semi; the data associated with the next output operation is still externalized&period; Note that the invalid data indicator can be detected by a corresponding `TestInStream` object&period;


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