A wrapper function is a function whose primary purpose is to call
another function. A simple (and useless) wrapper function would be:
int A (int x, int y, int z)
{
return B(x,y,z);
}
One use for wrapper functions is that you can modify the arguments:
int add_three_nums (int x, int y, int z)
{
return add_two_nums(x+y, z);
}
Or you can modify the return value:
char *allocate_memory (int size)
{
char *mem = my_alloc(size);
if (!mem)
return ERR_PTR(-ENOMEM);
else
return mem;
}
You can also use it if:
- you want to only export the wrapper functions but not the internal
ones.
- you want to do something simple before and/or after the function call
(such as checking arguments)
I probably also missed several uses for them, but I hope you get the
idea.
Avishay
On Mon, 2006-01-02 at 20:15 +0530, Md.Zaheeruddin Khan wrote:
> HI ,
> I want 2 know what is a wrapper function and where is it used?
> Thanks in anticipation,
> Zaheer
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