[#bsl-unary_compose-operator_call-09]
= xref:bsl.adoc[bsl]::xref:bsl/unary_compose.adoc[unary_compose]::operator()
:relfileprefix: ../../
:mrdocs:

Invoke `d_fn1(d_fn2(x))` and return the result.

== Synopsis

Declared in `<bslstp_exfunctional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unary_compose/result_type.adoc[result_type]
operator()(xref:bsl/unary_compose/argument_type.adoc[argument_type] const& x) const;
----


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