(*(int(*)())a)()是什么意思? [英] what is the meaning of (*(int (*)())a)()?

问题描述

我是学习C ++的初学者.今天，我看到了类似这样的指针函数

I am the beginner of learning C++. Today, I saw a pointer function like that

(*(int (*)())a)()

我对它的含义以及如何轻松理解它感到困惑.

I was very confused with what the meaning of this and how I can understand it easily.

推荐答案

让我们添加一个typedef，以帮助使它变得前后无误:

Let's add a typedef, to help make heads or tails out of it:

typedef int (*int_func_ptr)();

(*(int_func_ptr)a)();

因此，将 a 强制转换为特定原型的函数指针，将其取消引用(这是多余的)，然后调用.

So a is being cast to a function pointer of a particular prototype, dereferenced (which is redundant), and then called.

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