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Callback Function in C 2
- Thread starter SwapSawe
- Start date
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1
- #2
That's a pretty general question. Basically, a callback function is used to generalize a function so that it can performed a user-defined (user in the sense of a "user programmer" that uses the function) function on a set of data.
qsort() uses this mechanism where the user creates a comparison function (4th argument to qsort()) which qsort() calls as needed to sort the array elements.
In C, callback functions are implemented with function pointers.
Russ
bobbitts@hotmail.com
qsort() uses this mechanism where the user creates a comparison function (4th argument to qsort()) which qsort() calls as needed to sort the array elements.
In C, callback functions are implemented with function pointers.
Russ
bobbitts@hotmail.com
- Thread starter
- #3
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1
- #4
Call back prototype declaration:
typedef int (*My_function)(int in_iData);
Function with call back declaration:
int func(My_function fCallBack, int in_PassData)
{
fCallBack(in_PassData);
}
Call back function itself:
int PrintData(in_iData)
{
printf("Data:%d\n",in_iData);
}
Call back use:
func(PrintData, 5);
this will print "Data:5".
Good luck.
typedef int (*My_function)(int in_iData);
Function with call back declaration:
int func(My_function fCallBack, int in_PassData)
{
fCallBack(in_PassData);
}
Call back function itself:
int PrintData(in_iData)
{
printf("Data:%d\n",in_iData);
}
Call back use:
func(PrintData, 5);
this will print "Data:5".
Good luck.
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