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shadowclaw3
Expert Cheater
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Joined: 05 Aug 2007
Posts: 114
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 Posted: Tue Apr 07, 2009 6:44 pm Post subject: |
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ahh cool, thanks just needed to clear that.
dont think i need your msn with such fast replies lol,
thanks again.
EDIT:
| Code: | // pointer to functions
#include <iostream>
using namespace std;
int addition (int a, int b)
{ return (a+b); }
int subtraction (int a, int b)
{ return (a-b); }
int operation (int x, int y, int (*functocall)(int,int))
{
int g;
g = (*functocall)(x,y);
return (g);
}
int main ()
{
int m,n;
int (*minus)(int,int) = subtraction;
m = operation (7, 5, addition);
n = operation (20, m, minus);
cout <<n;
return 0;
} |
im not understanding this lesson so well, can someone explain all the parts? or maybe just
int (*minus)(int,int) = subtraction;
and how to do
m = operation (7, 5, addition);
n = operation (20, m, minus);
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Flyte
Peanuts!!!!
 Reputation: 6
Joined: 19 Apr 2006
Posts: 1887
Location: Canada
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| Posted: Thu Apr 09, 2009 12:07 am Post subject: |
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| shadowclaw3 wrote: | im not understanding this lesson so well, can someone explain all the parts? or maybe just
int (*minus)(int,int) = subtraction; |
That is a function cast. You can use it to call functions dynamically (like the address you get from using the GetProcAddress() function).
| shadowclaw3 wrote: | and how to do
m = operation (7, 5, addition);
n = operation (20, m, minus); |
You are passing the pointer to the start of the code of the function. The function then takes the pointer and casts it into a function, as said previously.
Also, in the future, delete your post then repost it so it gets bumped up to the top. I didn't see the edit until just now.
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