class String
{
    char *Ptr;
    uint32 str_length,Alloced_length;
    bool alloced;

public:
    inline char *c_ptr()
    {
        if (!Ptr || Ptr[str_length])    /* Should be safe */
            (void) realloc(str_length); //可能给Ptr分配内存
        return Ptr;
    }
};