[#BloombergLP-bslfmt-FormatterSpecificationNumericValue_ArgVisitor-operator_call-08]
= 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 non‐integral type, usually resulting from a user error such as calling `bsl::format("{:{}}", value, f)` where `f` has a floating point type.

== Synopsis

Declared in `<bslfmt_formatterspecificationnumericvalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
void
operator()(t_TYPE value) const
requires !bsl::is_integral<t_TYPE>::value;
----


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