[#BloombergLP-bslfmt-FormatterSpecificationNumericValue_ArgVisitor-operator_call-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::xref:BloombergLP/bslfmt/FormatterSpecificationNumericValue_ArgVisitor.adoc[FormatterSpecificationNumericValue_ArgVisitor]::operator()
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Throw an exception of type `format_error`. This indicates visitation of a `bsl::format` argument of boolean type, usually resulting from a user error such as calling `bsl::format("{:{}}", value, b)` where `b` is `bool`.

== Synopsis

Declared in `<bslfmt_formatterspecificationnumericvalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
operator()(bool) const;
----


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