函数返回值与通过引用传递的修改值
问题描述：
在什么情况下，最好返回一个对象，而不是仅仅修改通过引用传递给该函数的对象？我如何知道应该选择哪一个？
In what situations it is preferred to return an object instead of just modifying an object passed to that function by reference? How do I know which one should I pick?
实际上，问题是如果有没有能力返回一个对象
Actually, the question is if there are things I wouldn't be able to do without the ability to return an object from function, but instead only modifying objects passed by reference.
答
TYPE function () ;
和
void function (TYPE &value) ;
是前者可用于表达式。
a = 10 * function () ;
if（function（））
{
}
if (function ()) { }
这是主要的设计考虑。
除此之外，我必须得到意见。我将坚持客观的差异。
Beyond that, I would have to get into opinion. I am going to stick to the objective difference.