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

Write the accumulated state information held in the specified allocator `ta` to the specified `stream` in a reasonable (multi‐line) format identical to the format produced by `ta.print()` and return a reference offering modifiable access to `stream`. Output is performed via calls to `stream.write(s, count)`, where `write` is a required method of class `t_OS`, `s` is a `const char*` holding the formatted output, and `count` is the length of `s` excluding any null terminator. Note that `std::ostream` meets the requirements for `t_OS`.

== Synopsis

Declared in `<bslma_testallocator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
t_OS&
operator<<(
    t_OS& stream,
    xref:BloombergLP/bslma/TestAllocator.adoc[TestAllocator] const& ta);
----


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