什么是（double（^）（int））foofoo [英] What is (double (^)(int))foofoo

问题描述

有一个例子cdecl，（double（^）（int））foofoo 表示 cast foofoo into block

There is an example on cdecl that goes (double (^)(int))foofoo means cast foofoo into block (int) returning double.

将foofoo转换为int的块是什么意思？在此上下文中，符号 ^ 是什么意思。通常是按位XOR。

What does it mean to cast foofoo into a "block" of int? What does the symbol ^ exactly mean in this context. Usually it is bitwise XOR.

推荐答案

这是Apple制作的GCC扩展，块是小的未命名函数，并且语法是块的类型。请参见阻止语言规范。

It's a GCC extension made by Apple, and implemented also in Clang. Blocks are small unnamed functions and that syntax is the type of a block. See Block Language Spec.

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