用前缀生成宏的宏函数(避免字符串化) [英] Macro-function to generate macro with prefix (avoid stringification)
问题描述
背景
我有一个项目,其中有两个独立的产品,它们具有几乎相同的宏名称,为此我想创建一个类似宏的函数快速检索宏的值。我写了一个 getTranslation
宏函数来提供给函数的文本文本,它应该被当作一个字符串和一个字符串前缀(如下所示)。
问题
如何完成这项操作提供给宏的参数,将它们连接在一起(在中间用下划线),并将该结果作为预处理宏而不是字符串处理?
代码清单
/ **************** ************************************************** *************
* coconut.h
************************* ************************************************** *** /
#define COCONUT(PRODUCT_COCONUT)
#define COCONUT_FX_REGISTER(100)
#define COCONUT_BASE_REGISTER(101)
/ ******* ************************************************** **********************
* pineapple.h
**************** ************ ************************************************** /
#define PINEAPPLE(PRODUCT_PINEAPPLE)
#define PINEAPPLE_FX_REGISTER(200)
#define PINEAPPLE_BASE_REGISTER(201)
/ ********** ************************************************** *******************
* test.c.
********************************************** ******************************** /
#include< stdio.h>
#includetranslation.h
#includecoconut.h
int main(void){
$ b $ int i = getTranslation(FX_REGISTER , 椰子);
printf(翻译:%d.\\\
,i);
返回0;
}
/ ************************************ *******************************************
*翻译。 h
********************************************* ********************************* /
#define FX_REGISTER(0)
#define BASE_REGISTER(1)
#define getTranslationInternal(x,y)#y_#x
#define getTranslation(x,y)getTranslationInternal(x,y)
enum Products {
PRODUCT_COCONUT = 0,
PRODUCT_PINEAPPLE,
PRODUCT_MAX,
PRODUCT_INVALID =(-1)
};
编译器警告
test.c:在函数'main'中:
test.c:10:45:warning: Wint转换]
int i = getTranslation(FX_REGISTER,COCONUT);
^
translation.h:7:39:note:定义宏'getTranslationInternal'
#define getTranslationInternal(x,y)#y_#x
^
test.c:10:10:注意:在扩展宏'getTranslation'
int i = getTranslation(FX_REGISTER,COCONUT);
运行样本
翻译:4195812。
#define getTranslationInternal(x,y)y ## _ ## x
在叮当时为我工作,如果你放弃宏定义的括号。
Background
I have a project where I have two separate products with near-identical macro names, for which I would like to create a macro-like-function to retrieve the values of the macros quickly. I have written a getTranslation
macro-function to take the literal text provided to the "function", which should be treated as a string and a string prefix (shown below).
Question
How can I accomplish this operation of taking the arguments supplied to the macro, concatenating them together (with an underscore in the middle), and treating that result as a preprocessor macro instead of a string?
Code Listing
/*******************************************************************************
* coconut.h
******************************************************************************/
#define COCONUT (PRODUCT_COCONUT)
#define COCONUT_FX_REGISTER (100)
#define COCONUT_BASE_REGISTER (101)
/*******************************************************************************
* pineapple.h
******************************************************************************/
#define PINEAPPLE (PRODUCT_PINEAPPLE)
#define PINEAPPLE_FX_REGISTER (200)
#define PINEAPPLE_BASE_REGISTER (201)
/*******************************************************************************
* test.c.
******************************************************************************/
#include <stdio.h>
#include "translation.h"
#include "coconut.h"
int main(void) {
int i = getTranslation(FX_REGISTER, COCONUT);
printf("Translation:%d.\n", i);
return 0;
}
/*******************************************************************************
* translation.h
******************************************************************************/
#define FX_REGISTER (0)
#define BASE_REGISTER (1)
#define getTranslationInternal(x, y) #y "_" #x
#define getTranslation(x, y) getTranslationInternal(x, y)
enum Products {
PRODUCT_COCONUT = 0,
PRODUCT_PINEAPPLE,
PRODUCT_MAX,
PRODUCT_INVALID = (-1)
};
Compiler Warnings
test.c: In function ‘main’:
test.c:10:45: warning: initialization makes integer from pointer without a cast [-Wint-conversion]
int i = getTranslation(FX_REGISTER, COCONUT);
^
translation.h:7:39: note: in definition of macro ‘getTranslationInternal’
#define getTranslationInternal(x, y) #y "_" #x
^
test.c:10:10: note: in expansion of macro ‘getTranslation’
int i = getTranslation(FX_REGISTER, COCONUT);
Sample Run
Translation:4195812.
#define getTranslationInternal(x, y) y ## _ ## x
worked for me on clang, if you drop parentheses around the macro definitions.
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