[#bsl-select2nd-argument_type]
= xref:bsl.adoc[bsl]::xref:bsl/select2nd.adoc[select2nd]::argument_type
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:mrdocs:

This `typedef` is an alias to the (template parameter) `PAIR`.

== Synopsis

Declared in `<bslstp_exfunctional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef PAIR argument_type;
----


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