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AnswerRe: Difference between Typedef and #define? Pin
Rage9-Feb-06 21:20
professionalRage9-Feb-06 21:20 
GeneralRe: Difference between Typedef and #define? Pin
BadKarma9-Feb-06 22:07
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GeneralRe: Difference between Typedef and #define? Pin
Rage10-Feb-06 1:25
professionalRage10-Feb-06 1:25 
GeneralRe: Difference between Typedef and #define? Pin
BadKarma10-Feb-06 2:15
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GeneralRe: Difference between Typedef and #define? Pin
Rage10-Feb-06 2:55
professionalRage10-Feb-06 2:55 
GeneralRe: Difference between Typedef and #define? Pin
Ryan Binns10-Feb-06 11:58
MemberRyan Binns10-Feb-06 11:58 
GeneralRe: Difference between Typedef and #define? Pin
normanS12-Feb-06 20:14
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AnswerRe: Difference between Typedef and #define? Pin
Ryan Binns9-Feb-06 21:41
MemberRyan Binns9-Feb-06 21:41 
Never, ever use #define to define new types. It's just asking for trouble.

One reason the others haven't mentioned yet is multiple variable definitions on one line. Say you do this:
#define INTPTR int*
 
INPTR p1, p2;
You may think that p1 and p2 have the same type... They do not. p1 is an int* and p2 is an int. The preprocessor expands the macro definition to produce
int* p1, p2;
Remember that the * modifies the variable, not the type, so the * only makes p1 a pointer.

Typedefs don't have this problem
typedef int* INTPTR;
 
INTPTR p1, p2;
behaves exactly as expected.

Ryan
"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

GeneralRe: Difference between Typedef and #define? Pin
jhwurmbach10-Feb-06 3:09
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GeneralRe: Difference between Typedef and #define? Pin
Blake Miller10-Feb-06 4:13
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GeneralRe: Difference between Typedef and #define? Pin
jhwurmbach10-Feb-06 4:23
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GeneralRe: Difference between Typedef and #define? Pin
Blake Miller10-Feb-06 4:28
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GeneralRe: Difference between Typedef and #define? Pin
jhwurmbach10-Feb-06 4:34
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GeneralRe: Difference between Typedef and #define? Pin
Blake Miller10-Feb-06 4:41
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GeneralRe: Difference between Typedef and #define? Pin
BadKarma10-Feb-06 4:38
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GeneralRe: Difference between Typedef and #define? Pin
Blake Miller10-Feb-06 4:46
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GeneralRe: Difference between Typedef and #define? Pin
Ryan Binns10-Feb-06 11:53
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QuestionMy string class Pin
Sarvan AL9-Feb-06 17:56
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AnswerRe: My string class Pin
Bernhard9-Feb-06 19:57
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AnswerRe: My string class Pin
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AnswerRe: My string class Pin
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QuestionWidescreen aspect ratio in openGL Pin
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Questiondelete operator + Exception handling Pin
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