本文介绍了是否可以在C中自动生成的变量名称中使用__LINE__?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
为避免重复,我想在自动生成的变量名称中使用__LINE__
.
To avoid duplication, I want to use __LINE__
in the auto-generated variable name.
#define ROUTE(path, impl) \
char * k##impl##__LINE__##_route = "{"#path":\""#impl"\"}";
但始终将其视为普通字符串__LINE__
.
But it always be treated as a normal string __LINE__
.
即使我将其定义为以下内容,我也无法获得想要的东西:
Even if I define it as the following, I can not get what I want:
#define ROUTE(path, impl) ROUTE_(path, impl, __LINE__)
#define ROUTE_(path, impl, line) \
char * k##impl##line##_route = "{"#path":\""#impl"\"}";
推荐答案
您需要再嵌套一层:
#define ROUTE(path, impl) ROUTE_(path, impl, __LINE__)
#define ROUTE_(path, impl, line) ROUTE_1(path, impl, line)
#define ROUTE_1(path, impl, line) \
char * k##impl##line##_route = "{"#path":\""#impl"\"}";
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