Function ForEachNoDup

src/test/util/str.h:32–43

 */
template <typename CharType, size_t StringLength, typename Fn>
void ForEachNoDup(CharType (&string)[StringLength], CharType min_char, CharType max_char, Fn&& fn) {
    for (bool has_next = true; has_next; has_next = NextString(string, min_char, max_char)) {
        int prev = -1;
        bool skip_string = false;
        for (CharType c : string) {
            if (c == prev) skip_string = true;
            if (skip_string || c < min_char || c > max_char) break;
            prev = c;
        }
        if (!skip_string) fn();
    }
}

#endif // BITCOIN_TEST_UTIL_STR_H