LAMBDA防爆pressions [英] Lambda Expressions

问题描述

有人可以解释我的lambda前pressions＆安培;他们可用于。我用Google搜索它和放大器;有一个大概的了解。大部分的例子给出了C＃code。如何在普通的旧的C拉姆达前pressions ...？

Can somebody explain me lambda expressions & what they can be used for. I have googled for it & have a rough idea. most of the examples give c# code. How about lambda expressions in plain old C...?

推荐答案

实际上有两件事被称为拉姆达前pressions，这是相当松散的：

There are actually two things called "lambda expressions", which are rather loosely related:

1. LAMBDA前pressions是演算并密切涉及到函数式编程

1. Lambda expressions are fundamental part of lambda calculus and are closely related to functional programming

在命令式语言，拉姆达前pressions通常是匿名方法的同义词。在C＃中，比如你可以通过拉姆达前pression作为参数（即一个前pression本身，而不是它的结果。）

In imperative languages, lambda expressions are usually synonyms for anonymous methods. In C#, for example you can pass lambda expression (ie. an expression itself, not just its result) as an argument:

C＃：

someCollection.Apply (x => 2*x); // apply expression to every object in collection
// equivalent to 
someCollection.Apply (delegate (int x) { return 2 * X; });

话虽如此，C不支持匿名方法。你可以，但是，使用函数指针来实现类似的结果：

Having said that, C does not support anonymous methods. You can, however, use function pointers to achieve similar results:

int multiply (int x)
{
    return 2 * x;
}

...
collection_apply (some_collection, multiply);

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