[#BloombergLP-bslfmt-vformat_to-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::vformat_to
:relfileprefix: ../../
:mrdocs:

Format the specified `args` according to the specification given by the specified `fmtStr`, and write the result of this operation into the string addressed by the specified `out` parameter. In the event of an error the exception `format_error` is thrown. Behavior is undefined if `out` does not point to a valid `bsl::string` object.

== Synopsis

Declared in `<bslfmt_format_imp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
vformat_to(
    xref:bsl/string.adoc[bsl::string]* out,
    std::string_view fmtStr,
    xref:BloombergLP/bslfmt/format_args.adoc[format_args] args);
----


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