C++实现平方的安全方法（redis的实现）

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/* Our hash table capability is a power of two */static unsigned long _dictNextPower(unsigned long size){    unsigned long i = DICT_HT_INITIAL_SIZE; //DICT_HT_INITIAL_SIZE=4    if (size >= LONG_MAX) return LONG_MAX;    while(1) {        if (i >= size)            return i;        i *= 2;    }}