C“块”插入符 [英] C "block" caret character

问题描述

我注意到此涉及插入符号（^）字符的声明固定在顶部的cdecl.org网站上：

I've noticed that this declaration involving a caret (^) character is pinned on the cdecl.org site at the top:

// "cast foo into block(int, long long) returning double"
(double (^)(int , long long ))foo

有人可以在这里解释插入符号的目的是什么？这真的是C声明中的有效字符，还是某个东西的占位符？

Can somebody explain what is the purpose of the caret character here? Is this really a valid character in C declarations, or is this a placeholder for something?

推荐答案

插入符号是扩展的一部分C语言以使用块。块是Clang和Apple的GCC支持的C语言的扩展。它不是严格符合C的语言（也就是说，它不是C标准定义的核心C语言的一部分）。

The caret is part of an extension to the C language to work with blocks. Blocks are an extension to C supported by Clang and Apple’s GCC. It is not strictly conforming C (that is, not part of the core C language defined by the C standard).

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