重载方法或使用默认值？ c ++ [英] Overload a method or use default values? c++

问题描述

我还是相对较新的C + +，我似乎无法弄清楚下面两种方法的编码一个函数可能需要一个参数，或者可能两个或三个或更多。无论如何，这是我的观点

I'm still relatively new to C++ and I can't seem to figure out the difference in the following two ways of coding a function that may take one parameter or maybe two or three or more. Anyway, here's my point

函数重载：

int aClass::doSomething(int required)
{
    //DO SOMETHING
}

int aClass::doSomething(int required, int optional)
{
    //DO SOMETHING
}

与此不同的是，默认值：

how is this different to, default value:

int aClass::doSomething(int required, int optional = 0)
{
    //DO SOMETHING
}

我知道在不同的情况下，一个可能比另一个更合适，

I know in different circumstances one may be more suitable than another but what kinds of things should I be aware of when choosing between each of these options?

推荐答案

首先，你在谈论 >重载，不覆盖。在导出类中为 virtual 函数覆盖。重载是指具有不同签名的相同函数名。

First off, you're talking about overloading, not overriding. Overriding is done for virtual functions in a derived class. Overloading refers to the same function name with a different signature.

区别是逻辑的 - 在第一种情况下（两个版本），两个函数可以完全不同，第二种情况将具有或多或少相同的逻辑。这完全取决于你。

The difference is logical - in the first case (2 versions), the two functions can behave completely different, whereas the second case will have more or less the same logic. It's really up to you.

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