[#BloombergLP-balcl-OptionValue-2constructor-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balcl.adoc[balcl]::xref:BloombergLP/balcl/OptionValue.adoc[OptionValue]::OptionValue
:relfileprefix: ../../../
:mrdocs:

Create a command‐line‐option value object in the unset state (i.e., `OptionType::e_VOID == type()`), using the specified `basicAllocator` to supply memory. Note that (atypically) this constructor disallows 0 for `basicAllocator`; invoking the constructor with 0 dispatches to the constructor overload that explicitly accepts an `int` value for its first argument (see below).

== Synopsis

Declared in `<balcl_optionvalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
OptionValue(xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* basicAllocator);
----


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