[#BloombergLP-bslx-TestInStream-getUint40]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslx.adoc[bslx]::xref:BloombergLP/bslx/TestInStream.adoc[TestInStream]::getUint40
:relfileprefix: ../../../
:mrdocs:

If required, throw a `TestInStreamException` (see `throwExceptionIfInputLimitExhausted`); otherwise, consume the 8‐bit unsigned integer type code, verify the type of the next value in this stream, consume that 40‐bit unsigned integer value into the specified `variable` if its type is appropriate, update the cursor location, and return a reference to this stream. If the type is incorrect, then this stream is marked invalid and the value of `variable` is unchanged. If this stream is initially invalid, this operation has no effect. If this function otherwise fails to extract a valid value, this stream is marked invalid and the value of `variable` is undefined.

== Synopsis

Declared in `<bslx_testinstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bslx/TestInStream.adoc[TestInStream]&
getUint40(xref:BloombergLP/bsls/Types/Uint64.adoc[bsls::Types::Uint64]& variable);
----


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