I have version in 2 different descriptions, one as string and the other as value for example:
static const char * versionStr = "03-October-2022" ;
static const uint32_t versionVal = 20221003 ;
How can I test if they are equal (in compile time) to make sure I didn't update one without the other?
Solution in pure preprocessor smarts, I'm bound to C 98.
Quite a challenge :)
CodePudding user response：
You can't compare them at compile-time. But, what you can do is build up the values using preprocessor macros for the common elements, thus reducing the possibility of making a mistake, eg:
#define c_day 03
#define c_year 2022
#define c_month 10
#define c_month_name October
#define STRINGIFY(param) #param
#define make_versionStr(y, m, d) (STRINGIFY(d) "-" STRINGIFY(m) "-" STRINGIFY(y))
#define make_versionVal_concat(y, m, d) (y ## m ## d)
#define make_versionVal(y, m, d) make_versionVal_concat(y, m, d)
static const char* versionStr = make_versionStr(c_year, c_month_name, c_day);
static const uint32_t versionVal = make_versionVal(c_year, c_month, c_day);