[#BloombergLP-bdlde-Utf8Util-numCharactersIfValid-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlde.adoc[bdlde]::xref:BloombergLP/bdlde/Utf8Util.adoc[Utf8Util]::numCharactersIfValid
:relfileprefix: ../../../
:mrdocs:

Return the Unicode code‐point count if `string` is valid UTF‐8.

== Synopsis

Declared in `<bdlde_utf8util.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bdlde/Utf8Util/IntPtr.adoc[Utf8Util::IntPtr]
numCharactersIfValid(
    char const** invalidString,
    char const* string);
----

== Description

Return the number of Unicode code points in the specified `string` if it contains valid UTF‐8, with no effect on the specified `invalidString`. Otherwise, return a negative value and load into `invalidString` the address of the byte after the last valid Unicode code point traversed. `string` is necessarily null‐terminated, so it cannot contain embedded null bytes. Note that `string` may contain less than `bsl::strlen(string)` Unicode code points.

DEPRECATED: Use `numCodePointsIfValid` instead.

== Return Value

code‐point count on success, or a negative value on invalid UTF‐8

== Parameters

[cols="1,4"]
|===
| Name| Description
| *invalidString*
| if non‐null, set to after the last valid code point
| *string*
| null‐terminated UTF‐8 input to examine
|===


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