函数返回值与通过引用传递的修改值 [英] Function returning value vs modifying value passed by reference

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.

推荐答案

 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.

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