Are there any C preprocessor variables?
c, c-preprocessor, variables
Solution
There are no standard C preprocessor variables. As Oli Charlesworth suggested, using X-Macros is probably your best bet if you want to keep it just with standard C. If there really is a lot of associated data that would touch several files, you'll want to use a code generator like GNU autogen.
Problem
Is there anything like a preprocessor variable in C? It could simplify my definitions. Currently I have something like this: ``` typedef struct mystruct { int val1; int val2; int val3; int val4; } MYSTRUCT; typedef struct mysuperstruct { MYSTRUCT *base; int val; } MYSUPERSTRUCT; #define MY_OBJECT_BEGIN(name, val1, val2, val3, val4) \ MYSTRUCT name##Base = { val1, val2, val3, val4 }; \ MYSUPERSTRUCT * name##Objs = { #define MY_OBJECT_VALUE(name, val) \ { &(name##Base), val }, #define MY_OBJECT_END() \ NULL \ }; ``` It is used this way: ``` MY_OBJECT_BEGIN(obj1, 1, 2, 3, 4) MY_OBJECT_VALUE(obj1, 5) MY_OBJECT_VALUE(obj1, 6) MY_OBJECT_VALUE(obj1, 7) MY_OBJECT_END() ``` Which generates something like this: ``` MYSTRUCT obj1Base = { 1, 2, 3, 4 }; MYSUPERSTRUCT * obj1Objs = { { &(obj1Base), 5 }, { &(obj1Base), 6 }, { &(obj1Base), 7 }, NULL } ``` It's obvious that repetitive use of the object name is redundant. I would like to store the name in the MY_OBJECT_BEGIN definition to some preprocessor variable so that I can use it the following way: ``` MY_OBJECT_BEGIN(obj1, 1, 2, 3, 4) MY_OBJECT_VALUE(5) MY_OBJECT_VALUE(6) MY_OBJECT_VALUE(7) MY_OBJECT_END() ``` Does standard C preprocessor provide a way to achieve this?