[#bsl-function-0a-2constructor-02]
= xref:bsl.adoc[bsl]::xref:bsl/function-0a.adoc[function]::function
:relfileprefix: ../../
:mrdocs:

Create an empty `function` object. Optionally specify an `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory; otherwise, the default allocator is used.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
function(
    std::allocator_arg_t,
    xref:bsl/function-0a/allocator_type.adoc[allocator_type] const& allocator,
    xref:bsl/nullptr_t-08.adoc[nullptr_t]) noexcept;
----


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