[#BloombergLP-balcl-Constraint-StringConstraint]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balcl.adoc[balcl]::xref:BloombergLP/balcl/Constraint.adoc[Constraint]::StringConstraint
:relfileprefix: ../../../
:mrdocs:

Functor type that validates `bsl::string` option values; see `TimeConstraint`.

== Synopsis

Declared in `<balcl_constraint.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:bsl/function-0a.adoc[bsl::function<bool(xref:bsl/string.adoc[bsl::string] const*, std::ostream&)>] StringConstraint;
----


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