[#bsl-compose2]
= xref:bsl.adoc[bsl]::compose2
:relfileprefix: ../
:mrdocs:

Create a `binary_compose` adaptor from one binary and two unary functors.

== Synopsis

Declared in `<bslstp_exfunctional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class OPERATION1,
    class OPERATION2,
    class OPERATION3>
xref:bsl/binary_compose.adoc[binary_compose<OPERATION1, OPERATION2, OPERATION3>]
compose2(
    OPERATION1 const& fn1,
    OPERATION2 const& fn2,
    OPERATION3 const& fn3);
----

== Description

Return a `binary_compose` function object constructed using the specified `fn1` binary function, and the specified `fn2` and `fn3` unary functions. The returned function object is equivalent to `fn1(fn2(x), fn3(x))`.

== Return Value

`binary_compose` adaptor equivalent to `fn1(fn2(x), fn3(x))`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fn1*
| binary functor applied to the results of `fn2` and `fn3`
| *fn2*
| unary functor applied to the left‐hand argument
| *fn3*
| unary functor applied to the right‐hand argument
|===


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