[#BloombergLP-bslfmt-format_to_n-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::format_to_n
:relfileprefix: ../../
:mrdocs:

Format `args` per `fmtStr` into `out`, writing at most `maxNumChars` characters.

== Synopsis

Declared in `<bslfmt_format_imp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_OUT,
    class... t_ARGS>
format_to_n_result<t_OUT>
format_to_n(
    t_OUT out,
    bsl::iterator_traits<t_OUT>::difference_type maxNumChars,
    xref:BloombergLP/bslfmt/wformat_string.adoc[bslfmt::wformat_string<t_ARGS...>] fmtStr,
    t_ARGS const&... args);
----

== Description

Format the specified `args` according to the specification given by the specified `fmtStr`, and write at most the specified `maxNumChars` characters of the result of this operation into the output iterator referenced by the specified `out` parameter. Return a `format_to_n_result` object whose `size` member holds the number of characters that would have been written to `out` were such writing not truncated, and whose `out` member holds an iterator one past the end of the output range. In the event of an error the exception `format_error` is thrown. Behavior is undefined if `out` does not point to a valid output iterator.


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