nodejs 源码中c++ macro的某种用法？

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代码在 src/node_extentions.cc中，通过两次include 就完成了对node_module_list 这个指针数组的赋值。但是对这个数组赋值是 = { ... } 的用法感到好别扭啊~~

#include "node.h"
#include "node_version.h"
#include <string.h>
#include <stdio.h>

#undef NODE_EXT_LIST_START
#undef NODE_EXT_LIST_ITEM
#undef NODE_EXT_LIST_END

#define NODE_EXT_LIST_START
#define NODE_EXT_LIST_ITEM NODE_MODULE_DECL
#define NODE_EXT_LIST_END

#include "node_extensions.h"

#undef NODE_EXT_LIST_START
#undef NODE_EXT_LIST_ITEM
#undef NODE_EXT_LIST_END

#define NODE_EXT_STRING(x) &x ## _module,
#define NODE_EXT_LIST_START node::node_module_struct *node_module_list[] = {
#define NODE_EXT_LIST_ITEM NODE_EXT_STRING
#define NODE_EXT_LIST_END NULL};

#include "node_extensions.h"

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6 replies • 1970-01-01 08:00:00 +08:00