如何模拟多参数副作用函数 [英] How to emulate a multi-parameter side-effect Function

问题描述

我想模仿以下界面：

interface MultiSideEffectFunction<T> {
    void action(T first, T second);
}

（这将使我免于引入新界面）

(it would save me from having to introduce a new interface)

有没有首选的番石榴方法来做这件事？

is there a preferred Guava approach to doing this?

注意：我想用

Function<Pair<T>, Void>

但有两个问题使得创建新界面更为可取：

but there are two problems which makes the creation of a new interface preferable:

1. 必须定义一个名为 Pair< T> 的类，它看起来很像 Map.Entry< T，T> 带有更合适的getter名称（作为第二个问题：是否有像这样的Guava类型？）。


2. Void 返回类型总是很痛苦 - 拥有真正的 void 签名会更好。

1. One must define a class called Pair<T>, which looks a lot like a Map.Entry<T, T> with more appropriate getter names (as a second question: is there a Guava type like this?).
2. The Void return type is always a pain - it would be better to have a genuine void signature.

推荐答案

这里的番石榴贡献者。

首选番石榴方法是编写自己的界面。

The preferred Guava approach is to write your own interface.

特别是，不使用功能 ; 函数只应在函数没有副作用时使用。

In particular, do not use Function; Function should only be used when the function doesn't have side effects.

Guava故意缺少对类型;我们建议您在需要配对时，创建自己的类，将有用的名称附加到两个值，而不是完全没有信息的第一和第二。 （原型示例用于GPS坐标;名为 LatLong 的类比对< Double，Double> 。）

Guava deliberately lacks a Pair type; we advise that any time you need a pair, you create your own class that attaches useful names to the two values, rather than the utterly uninformative "first" and "second". (The prototypical example is for GPS coordinates; a class entitled LatLong is much more informative than a Pair<Double, Double>.)

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