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can some one ex-plane how typedef works under C? [Solved]

post #1 of 25
Thread Starter 
yeah i know a lot of c but recently came across this thing called typedef can someone explane this and what it does thanks

i haven't done c in a while but reminder most of what i learnt except this thanks for any help smile.gif
Edited by thecoredude98 - 2/14/12 at 9:06pm
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post #2 of 25
In its simplest form alias types... Or assign alternative names to existing types.

For example, I could give an alernative name to the "int" type:
Code:
typedef int MY_BETTER_NAME_FOR_THIS_TYPE

It can also simplify declaring pointers, for example, this is often used in Windows, for example a HANDLE is defined as:
Code:
typedef void *HANDLE

Which is quite simply a void pointer, but it simplifies usage across the whole Win32 API because in C you declare multiple variables of the same type in a single statement, even mixing pointer and non-pointers, which can lead to confusion or subtle syntax errors.

Consider the following linked list node structure:
Code:
struct NODE
{
    void *data;
    struct NODE *Start, *End, Current;
};

Can you spot the error above? The last definition of Current has missed the asterisk by mistake by the programmer (and while this is certainly valid, I would bet 100% it was hardly the original intention). So, instead we can do this:
Code:
typedef struct NODE *NODE_PTR;

struct NODE
{
    void *data;
    NODE_PTR Start, End, Current;
};

Now all those declarations are forced as pointers from the typedef, not requiring an asterisk to define them as such at all. Actually, we can combine the whole thing into one, like this:
Code:
typedef struct NODE 
{
    void *data;
    NODE_PTR Start, End, Current;
} *NODE_PTR;
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post #3 of 25
Thread Starter 
im going to read that though a few times but makes sense
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post #4 of 25
Yeah... tongue.gif

Oh I forgot to add that you can use typedef for function pointers:
Code:
typedef BOOL ( *PREDICATE_PTR )( void* ); /* Declares a predicate taking a void pointer and returning a Win32 BOOL */

/* Now we can do something like this... */
void* GetItemsWithPredicate( PREDICATE_PTR pPredicate )
{
        /* do something with the function pointer */
        return NULL;
}

BOOL MyPredicate( void *pData )
{
        /* do something */
        return TRUE;
}

void* items = GetItemsWithPredicate( MyPredicate );
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post #5 of 25
Thread Starter 
so basically its a diffident way to handle data instead of using the sturct function?


Code:
#include <stdio.h>
#include <conio.h>

struct cat{
  
  int x;
  int y;     
       
};



int main(){
    
struct cat f;

f.x = 50;
 
    
printf("%d",f.x);  
    
getchar();
    
}


so it just handles data differently i assume?
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post #6 of 25
Quote:
Originally Posted by thecoredude98 View Post

so basically its a diffident way to handle data instead of using the sturct function?
Code:
#include <stdio.h>
#include <conio.h>
struct cat{
  
  int x;
  int y;     
       
};
int main(){
    
struct cat f;
f.x = 50;
 
    
printf("%d",f.x);  
    
getchar();
    
}
so it just handles data differently i assume?

Err, that confused the hell out of me! What are you asking?
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post #7 of 25
Thread Starter 
well i am asking how typedef works

sorry what i meant is it like declaring a varrible but instead handles data differently
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post #8 of 25
Quote:
Originally Posted by thecoredude98 View Post

well i am asking how typedef works
sorry what i meant is it like declaring a varrible but instead handles data differently

typedef just tells the compiler that you've given a type another name...

I am not too sure what you mean by "handles data differently." smile.gif
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post #9 of 25
Thread Starter 
thats what i mean smile.gif sorry im half asleep but i understand it so its just telling the compiler thats you given a type a new name.
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post #10 of 25
Quote:
Originally Posted by thecoredude98 View Post

thats what i mean smile.gif sorry im half asleep but i understand it so its just telling the compiler thats you given a type a new name.

In its most simplest form, yes that is indeed what it does smile.gif
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