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ICONTAINEROF 宏定义的疑惑 #54

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QXSoftware opened this issue Feb 1, 2017 · 0 comments

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QXSoftware commented Feb 1, 2017 •

edited

大神您好！我研读您的 kcp 协议代码，发现一处地方不太明白，具体是 ikcp.h 的 156~157 行。如下：

#define ICONTAINEROF(ptr, type, member) ( \
	(type*)( ((char*)((type*)ptr)) - IOFFSETOF(type, member)) )

这里 ptr 是指向 member 的指针，而 type 是包含 member 成员的父结构类型，所以 (char*)((type*)ptr) 这个强制转换为 type* 的过程感觉有点儿奇怪，感觉有点儿多余。不知是否有什么特殊的技巧还是纯粹多写了一个强制转换？

This was referenced Feb 5, 2017

fix ICONTAINEROF #60

Closed

avoid useless cast #62

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QXSoftware closed this as completed

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