Function isHighSurrogate

valdi_core/src/valdi_core/cpp/Text/UTF16Utils.cpp:28–30

// instead of creating a new string everytime.

static inline bool isHighSurrogate(char16_t c) {
    return (c >= 0xD800) && (c < 0xDC00);
}
static inline bool isLowSurrogate(char16_t c) {
    return (c >= 0xDC00) && (c < 0xE000);
}