推荐回答（2个）
假设有个类A，如下语句：A a；A b=a；
这时候的复制运算符会起作用，而且是以成员函数被调用的，等价于b.operate=（a）。如果不是成员函数，那么不能这样使用。另外，必须重载说法是有问题的，只有类里面有指针成员的时候才需要重载
假如这样可行的话，如果你所在的团队几个人分工写代码，本来各自代码部分都能正常运行，结果一拼接起来，由于你这样的要求，改变了别人写的函数的本意，例如double fuction(double a,double b) {return a+b;}结果返回了0，你的队友一定会打死你的。所以，为了你的生命安全，C++标准委员会禁止了这样的做法。
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