C++ 来自宏参数的变量名
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Variable name from macro argument
提问by Paul Manta
I'd like to do something like this:
我想做这样的事情:
class SomeClass { };
GENERATE_FUNTION(SomeClass)
The GENERATE_FUNCTION
macro I'd like to define a function whose name is to be determined by the macro argument. In this case, I'd like it to define a function func_SomeClass
. How can that be done?
该GENERATE_FUNCTION
宏我想定义的名字是由宏参数确定的函数。在这种情况下,我希望它定义一个函数func_SomeClass
。那怎么办呢?
回答by K-ballo
#define GENERATE_FUNCTION(Argument) void func_##Argument(){ ... }
More information here: http://en.wikipedia.org/wiki/C_preprocessor#Token_concatenation
更多信息在这里:http: //en.wikipedia.org/wiki/C_preprocessor#Token_concatenation
回答by Dmitri
As everyone says, you can use token pasting to build the name in your macro, by placing ##
where needed to join tokens together.
正如大家所说,您可以使用标记粘贴在宏中构建名称,方法是放置##
需要将标记连接在一起的位置。
If the preprocessor supports variadic macros, you can include the return type and parameter list too:
如果预处理器支持可变参数宏,您也可以包含返回类型和参数列表:
#define GENERATE_FUNCTION(RET,NAM,...) RET func_##NAM(__VA_ARGS__)
..so, for example:
..所以,例如:
GENERATE_FUNCTION(int,SomeClass,int val)
..would expand to:
..将扩展为:
int func_SomeClass(int val)
回答by Tim Cooper
#define GENERATE_FUNCTION(class_name) func_##class_name##