[#BloombergLP-bdld-operator_lshift-0ca]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::operator<<
:relfileprefix: ../../
:mrdocs:

Write the value of the specified `rhs` object to the specified output `stream` in a single‐line format, and return a reference to the modifyable `stream`. If `stream` is not valid on entry, this operation has no effect. Note that this human‐readable format is not fully specified, can change without notice, and is logically equivalent to: ` print(stream, 0, ‐1); ` Single line output format for the `DatumError` object is shown below: ` error(n) error(n,'msg') ` (where n is the integer error code value and `msg` is the error message value in single quotes). Note that the first version will be output if there is no error message string.

== Synopsis

Declared in `<bdld_datumerror.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::ostream&
operator<<(
    std::ostream& stream,
    xref:BloombergLP/bdld/DatumError.adoc[DatumError] const& rhs);
----


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