Function isDouble

eval/CIPO_evaluation/common/gason.h:58–60

        ival = JSON_VALUE_NAN_MASK | ((uint64_t)tag << JSON_VALUE_TAG_SHIFT) | (uintptr_t)payload;
    }
    bool isDouble() const {
        return (int64_t)ival <= (int64_t)JSON_VALUE_NAN_MASK;
    }
    JsonTag getTag() const {
        return isDouble() ? JSON_NUMBER : JsonTag((ival >> JSON_VALUE_TAG_SHIFT) & JSON_VALUE_TAG_MASK);
    }