Function utf8proc_grapheme_break_stateful 

pub unsafe extern "C" fn utf8proc_grapheme_break_stateful(
    codepoint1: utf8proc_int32_t,
    codepoint2: utf8proc_int32_t,
    state: *mut utf8proc_int32_t,
) -> utf8proc_bool

Given a pair of consecutive codepoints, return whether a grapheme break is permitted between them (as defined by the extended grapheme clusters in UAX#29).

@param codepoint1 The first codepoint. @param codepoint2 The second codepoint, occurring consecutively after codepoint1. @param state Beginning with Version 29 (Unicode 9.0.0), this algorithm requires state to break graphemes. This state can be passed in as a pointer in the state argument and should initially be set to 0. If the state is not passed in (i.e. a null pointer is passed), UAX#29 rules GB10/12/13 which require this state will not be applied, essentially matching the rules in Unicode 8.0.0.

@warning If the state parameter is used, utf8proc_grapheme_break_stateful must be called IN ORDER on ALL potential breaks in a string. However, it is safe to reset the state to zero after a grapheme break.