在C ++预处理器中组合两个#defined符号 [英] Combining two #defined symbols in C++ preprocessor
本文介绍了在C ++预处理器中组合两个#defined符号的处理方法,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
我想做的事
#define VERSION XY123
#define PRODUCT MyApplication_VERSION
,因此PRODUCT实际上是MyApplication_XY123。我曾尝试与合并运算符##一起玩,但是成功有限。
so that PRODUCT is actually MyApplication_XY123. I have tried playing with the merge operator ## but with limited success...
#define VERSION XY123
#define PRODUCT MyApplication_##VERSION
=> MyApplication_VERSION
=> MyApplication_VERSION
#define VERSION XY123
#define PRODUCT MyApplication_##(VERSION)
=> MyApplication_(XY123)-关闭但不完全
=> MyApplication_(XY123) - close but not quite
我想要什么?
推荐答案
令牌粘贴与宏参数一起使用。所以试试这个
Token pasting works with arguments to macros. So try this
#define VERSION XY123
#define PASTE(x) MyApplication_ ## x
#define PRODUCT PASTE(VERSION)
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