[#BloombergLP-bdlde-Utf8Util-numCodePointsIfValid-089]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlde.adoc[bdlde]::xref:BloombergLP/bdlde/Utf8Util.adoc[Utf8Util]::numCodePointsIfValid
: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[IntPtr]
numCodePointsIfValid(
    char const** invalidString,
    std::string_view const& string);
----

== Description

Return the number of Unicode code points in the specified `string` if `string` contains valid UTF‐8, with no effect on the specified `invalidString`. Otherwise, return a value from the `ErrorStatus` `enum` (which are all negative) and load into `invalidString` the address of the byte after the last valid Unicode code point traversed. `string` need not be null‐terminated and may contain embedded null bytes.

== Return Value

code‐point count on success, or an `ErrorStatus` value

== Parameters

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


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