[#BloombergLP-bdld-operator_lshift-015]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::operator<<
:relfileprefix: ../../
:mrdocs:

Write the specified `rhs` value to the specified output `stream` in the format shown in the second column in the table below (based on the type of value stored, indicated by the first column): ` null ‐ nil

== Synopsis

Declared in `<bdld_datum.h>`

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

== Description

bool ‐ true/false

DatumError ‐ error(code)/error(code, `msg`) where `code` is the integer error code and `msg` is the error description message

int ‐ plain integer value

Int64 ‐ plain Int64 value

double ‐ plain double value

string ‐ plain double‐quoted string value

array ‐ [ elem0, ..., elemN] where elem1..elemN are output for individual array elements

int‐map ‐ [key0 = val0, ..., keyN = valN] where keyX and valX are respectively key and value of the map entry elements of the map

map ‐ [key0 = val0, ..., keyN = valN] where keyX and valX are respectively key and value of the map entry elements of the map

bdlt::Date ‐ ddMONyyyy

bdlt::Time ‐ hh:mm:ss.sss

bdlt::Datetime ‐ ddMONyyyy_hh:mm:ss.sss

bdlt::DatetimeInterval ‐ sDD_HH:MM:SS.SSS (where s is the sign(+/‐))

DatumUdt ‐ user‐defined(address,type) where `address` is a hex encoded pointer to the user‐defined object and `type` is its type ` and return a reference to the modifiable `stream`. The function will have no effect if the specified `stream` is not valid.


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