Question
Declare Typedef array size with external Macro
Posted on May 29, 2018 at 15:25
Good day everyone,
I'm trying to create a typedef for array in a header file. The size of this array should be defined by a macro from another header file. A quick snippet of my code is as follows:
HTPA.h
#ifndef HTPA_H_#define HTPA_H_
#define HTPA_IMG_WIDTH 80 // The array size I want
#endif /* HTPA_H_ */
ads.h
#ifndef ADS_H_
#define ADS_H_#include 'HTPA.h'
typedef uint16_t ADS_GradImg [
HTPA_IMG_WIDTH
]; // The array typedef I want#endif /* ADS_H_ */
When I try to compile this I get the error:
../Inc/ads.h:65:31: error: 'HTPA_IMG_WIDTH
' undeclared here (not in a function) I have searched the web, but can't find a similar problem. I have a hunch that it is because how the pre-processor/compiler works, but can't seem to find a solution around it.Can I make this work? Or will I have to use a workaround?
Thanks in advance!
#gcc #c #typedef #header #macro