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 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 is necessarily null-terminated, so it cannot contain embedded null bytes. Note that string may contain less than bsl::strlen(string) Unicode code points.
Declared in <bdlde_utf8util.h>
static
IntPtr
numCodePointsIfValid(
char const** invalidString,
char const* string);