在功能阵列逻辑运算符 [英] Logical operator on array of functions

问题描述

我已经有这个想法了一段时间，我很好奇，如果有可能在一个值得方法来实现。我想利用布尔返回拉姆达前pressions的数组，并对其结果进行逻辑运算。这里是一个有效的列表的毫无意义的例子：

I've had this idea for a while, and I'm curious if it's possible to implement in a worthwhile way. I want to take an array of boolean-returning lambda expressions and perform logical operations on their results. Here's a pointless example of a valid list:

var tests = new List<Func<int, bool>>() {
    (x) => x > 10,
    (x) => x < 100,
    (x) => x != 42
};

我想要做的本质上是

What I'd like to do is essentially

bool result = tests.And();

或执行其它逻辑运算。我知道我可以写一个IEnumerable，实现类和做到这一点，但如果它已经做了我想知道。很明显，实现具有以相同的方式，有效地工作，短路

or perform other logical operations. I realize I could write an IEnumerable-implementing class and do this, but I was wondering if it has already been done. Obviously, the implementation has to work efficiently, short-circuiting in the same way as

if (truthyExpression || falseyExpression)

将永远围绕得到评估 falseyEx pression 。

我的框架，也许可以有助于唯一看到的是的位阵列，但我不知道我怎么可以用，如果没有pre-评估每前pression，击败短cicuiting的实用性。

The only thing I see in the framework that could maybe be helpful is Bit Array, but I'm not sure how I could use that without pre-evaluating every expression, defeating the usefulness of short-cicuiting.

推荐答案

您可以使用内置的 Enumerable.Any 和 Enumerable.All 扩展方法。

You could use the built-in Enumerable.Any and Enumerable.All extension methods.

bool andResult = tests.All(test => test(value));
bool orResult = tests.Any(test => test(value));

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