[#BloombergLP-bdlt-FormatUtil]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::FormatUtil
:relfileprefix: ../../
:mrdocs:

This `class` serves as a namespace for some static functions that are useful in creating specializations of `bsl::formatter` to support `bsl::format`.

== Synopsis

Declared in `<bdlt_formatutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_CHAR>
class FormatUtil;
----

== Type Aliases

[cols="1"]
|===
| Name
| xref:BloombergLP/bdlt/FormatUtil/StringView.adoc[`StringView`] 
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlt/FormatUtil/writeSecondFraction.adoc[`writeSecondFraction`] 
| Write the fraction of a second from the timeCache to `d_out`, where the `precision` is the number of digits of precision wanted. Use `decimalChar` (expected to be '.' or ',') as a decimal point, and if `precision == 0` output nothing. If `6 < precision`, write '0' characters following the first 6 digits. The behavior is undefined unless `0 <= millisecond < 1000`, `0 <= microsecond < 1000`, and `0 <= precision`.
| xref:BloombergLP/bdlt/FormatUtil/writeZeroPaddedDigits.adoc[`writeZeroPaddedDigits`] 
| Write the specified `value` in decimal to the specified `out`. Always write the specified `numDigits` digits, '0'‐padding to the left if necessary. Return the iterator after output is done. The behavior is undefined unless `2 <= numDigits <= 6` and `0 <= value < pow(10, numDigits)`.
|===



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