Pelles C forum

C language => Tips & tricks => Topic started by: JohnF on September 22, 2005, 11:10:02 AM

Title: Difficult declarations
Post by: JohnF on September 22, 2005, 11:10:02 AM

An interesting code snippet that tells you what a declaration is. For example, many will find the following difficult;

Code: [Select]

char *(*c[10])(int **p);

The program output for the above is

"c is array 0..9 of pointer to function returning pointer to char"

I think the code was by Peter van der Linden

John

Title: Difficult declarations
Post by: jack on September 23, 2005, 08:01:19 PM

Thanks JohnF, I have been looking for a utility that would de-mystify declarations, especially declarations with structures.
Now if you would extend this utility to graphically display variable declarations and structures as a tree-view I would pay for it. :)

Title: Difficult declarations
Post by: JohnF on September 23, 2005, 08:44:10 PM

Quote from: "jack"

Thanks JohnF, I have been looking for a utility that would de-mystify declarations, especially declarations with structures.
Now if you would extend this utility to graphically display variable declarations and structures as a tree-view I would pay for it. :)

Can you give an example?

John

Title: Difficult declarations
Post by: Mikehg on September 24, 2005, 03:25:46 PM

Hi John,

It seems this could be a lot more useful if the data type didn't need to be known.  i.e. it might be written as char* or LPSTR. and of course UDT's.

Thanks,
Mike H.

Title: Difficult declarations
Post by: JohnF on September 24, 2005, 03:40:17 PM

I doubt it would take much to add the extra code to deal with Windows types.

EDIT: Or you could try to do it your way.

John

Title: Difficult declarations
Post by: JohnF on September 25, 2005, 10:04:05 AM

I've made a few changes to this project.

It will deal with a commandline arg, makes it easier for testing and development.

The types are now stored in an array so more types can be added easily as required.

Code: [Select]


char * sTypes[] = {"void",
"char",
"LPSTR",
"LPCSTR",
"signed",
"unsigned",
"short",
"WORD",
"int",
"INT",
"long",
"LONG",
"DWORD",
"float",
"double",
"struct",
"union",
"enum"};  // 18
#define NUMTYPES 18


John