果然,C语言就不贱嗖嗖的:以realloc为例

果然,C语言就不贱嗖嗖的:以realloc为例贱嗖嗖,也许是东北方言?它的意思大致是别人不需要你做的事情,你偏要替别
人做了,甚至可能还起到了负面的效果。比如网上有张照片的笑话,说是保姆看
小资的单反镜头太脏了,全泡肥皂水里刷了一遍。大致吧,这个时候小资心里的
看法大致就是你怎么这么贱嗖嗖的。据说计算机程序是牛人设计出来,给傻子用的。既然是给傻子用的,就一定要考
虑得非常周到才行。所以,作为傻子之一,我就常有这样的感慨:你怎么这么贱
嗖嗖的。前两天跟包师弟、关同学、孙同学一起写驱动,用了windows7操作系统。整个下
午诸多不顺,原因,我总结的一条就是一众软件都贱嗖嗖的。比如,win7下拖动
文件图标,它跳出来问你,你是要复制啊还是要搬移,还是要怎么的。难道我的
操作指令还不够明确,或者win7的用户比winxp的用户更弱智了,所以它觉得不
得不提醒一下?我想起了当年玩光荣公司的三国志英杰传,每当退出的时候,它都会三番五次地
跟你确认"你真的是要退出了么""你的确是要退出了么""退出游戏可就不能玩了啊
",大致这样的意思。终于客气完了,界面就要回到操作系统之前,它又跳出来
说,"您辛苦啦。"周到,真是周到。看日本小巷里老头老太太不断地相互鞠躬道别,也不过如此。
转过街角,还要回头再哈一下腰吧。周道则周道矣,效率却奇差无比。我要退出就是要退出的意思,你一遍一遍地跟我确认,真是伤害我的自尊,好像
不如此关照不足以彰显我是个弱智儿童。你能悄没声地干活,少跳出来提醒我么。
同样的道理也适用于QQ、360等非要在启动的时候弹出个窗口,提醒我现在有哪
些国家大事。还有windows窗口右上角那个血红的叉子,我想退出的时候能找得
到,不用这么明显地一直一直提醒我你存在。这么贴心 (还有某处方言,窝心)地关照,总让我担心里面包藏祸心。马利老师前两天博客提到,他如何教导了刺头同学。他作为男老师的这种干脆
劲,该罚罚该讲道理讲道理,令人耳目一心。作为对比,我不由得想起当年教过
我的一些女性老师。柔则柔矣,有些确实有阴的痕迹。盖阴柔二字组成一词不是
没有道理的。编排老师不是我等学生应该做的事,所以某些女老师的做法估且跳过。编排另一
位,女医生。N年前我看牙的时候,那位牙医是位女士。当时我做的是根管治疗,
就是拿一根特细的小铁丝往里面捅啊捅,然后钻两圈。我很快就全身温透了。她
总是阴柔地说"快了快了"。此时我想,反正快了,可以再忍一下。但是,仍然没
有"快"结束。如是者三,我就明白了,她在骗我,"快了"二字就再也起不到任何
作用了。再后来,她说其实如果实在受不了,是可以用麻药的。虽然道理上似乎
对,但是我却再也不相信她,一定要封上不治了。"快了"不是一个她预见到可能发生的事件,而是用来安慰病人的一组声音而已。
而它起作用的前提,是病人相信这组声音的意义。当这组声音失去意义的时候,
信任也一同失去了。类似的引导性的关照,你是不是在你的女老师身上也发现过?孙子兵法说,不要告诉士兵行军的目标;使用士兵,要如驱羊群。这种观点据说
现代还有些争议,即是否要发挥人民群众的力量、人民群众到底是不是主人、主
人价值如何体驱啥的。这些观点都太高深了,我完全无法理解。我能理解的是:
君视民如草芥,民视君如寇仇。如果你骗我,利用我,驱使我,认为我是弱智,
我没有理由表现很聪明的样子啊。当软件把用户当成襁褓里的婴儿,这样呵护下成长起来的用户还有能力做些什么
呢?同样,凡事都由老师安排好了的学生,一旦失去或离开老师,会有什么样的
能力呢?据说某些初中学校的教学方法就是让学生做题做题做题,学生们做题做
伤了,到了高中大学就没有后劲了。我倒更乐意相信,那是因为老师在学习方法
上把学生照顾得太无微不致了,学生没有获得 (而不是失去)了主动性和独立性。独立地判断,正是人类区别于动物的一个特征。独立于感受,运用理性;独立于
他人,保持自我。也有个别的程序,知道尊重用户,或者说,把用户当成与它同等聪明和具有判断
力的"人类"。袁小康同学来信问我,C/C++中的realloc函数的事。他说:realloc重新为一个
指针指向的内存分配空间。如果剩余的空间够大,内存地址不变,空间向后延
伸;如果内存空间不够大,那么,系统为这一指针指向的内存重新分配一块空
间,把原来空间里的东西都复制过来。他的问题的:如果还有其他的指针指向同
一空间,那些指针怎么办呢?如果不进行任何处理,那些指针就成了野指针。我回信,猜系统会更新那些指针的地址。而且建议他做实验验证一下。没多一会儿,袁同学回信来,其余的指针的地址并未更新。我猜错了。查了一下资料。C/C++的realloc就是没有更新那些指针的地址,它只是把新的
(或旧的)地址作为返回值了。判断地址是否换了,是程序员,而不是编译器或运
行时库的责任。表面上看,C/C++对程序员关照得并不充分细致。但是,考虑到并非每次realloc
都会导致内存地址改变,如果每次realloc都更新所有指针,会导致效率下降。
这些并非必要的工作,C/C++交由程序员处理,而不是事无巨细,万帮代办。C/C++相信和要求它的程序员是睿智的人类,因此,它的使用者,或者说能够驾驭
它的,也一定是睿智的人类。请注意,是驾驭C/C++的,而不是被C/C++驾驭的。
那些细心为你考虑所有问题,希望你连思考都不必的,一定是希望驾驭你。尊重的特征,是真诚。与工具的交流是这样,与人的交流也没有区别。如果我们交流,我要知道所有发生的事情,我可以选择放弃知道,你也可以选择
拒绝告知。但是,欺骗、隐瞒、诱导、强迫、暗示并考验,都是对我故意冒犯和
挑战,此时,我就不得不以反击证明我的智商比你估计的要高一些。或者,你明确地告诉我,在这件事中,我是工具,因此不必负有人类的责任。然
后,我来告诉你我是否愿意。

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