[#BloombergLP-bslx-InStreamFunctions-bdexStreamIn-0c6]
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:mrdocs:

Assign to the specified `variable` the `VALUE_TYPE` value read from the specified input `stream`, and return a reference to `stream`. If `stream` is initially invalid, this operation has no effect. If needed, first read the version information from the `stream` and if this version is not supported by `VALUE_TYPE`, `stream` is invalidated, but otherwise unmodified. If `stream` becomes invalid during this operation, `variable` has an undefined, but valid, state. Note that the version is only needed when the (template parameter) `VALUE_TYPE` is a `bsl::vector` or a user‐defined type. See the `bslx` package‐level documentation for more information on BDEX streaming of value‐semantic types and containers.

== Synopsis

Declared in `<bslx_instreamfunctions.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class STREAM,
    class VALUE_TYPE>
STREAM&
bdexStreamIn(
    STREAM& stream,
    VALUE_TYPE& variable);
----


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