[#BloombergLP-bdef_Function]
= xref:BloombergLP.adoc[BloombergLP]::bdef_Function
:relfileprefix: ../
:mrdocs:

Forward declaration of legacy `bdef_Function` in order to implement by‐reference conversion from `bsl::function<F>`. This declaration produces a by‐name cyclic dependency between `bsl` and `bde` in order to allow legacy code to transition to `bsl::function` from (the deprecated) `bdef_Function`. The conversion, and therefore this forward reference, should not appear in the open‐source version of this component.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class PROTOTYPE>
class bdef_Function;
----


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