Re: Why do I get stack overflow?

2009-05-25 Thread bearophile 
Ary Borenszweig:
 Thanks. Later in my head I instantiated the template and noticed the 
 problem.

In time I have created similar problems in my code 2-3 times, missing a 
static before some if.
Can't the compiler help spot such bugs? If the variables a dynamic if works on 
are constants (expecially if they are types) the compiler may give a warning...

Bye,
bearophile

Why do I get stack overflow?

2009-05-24 Thread Ary Borenszweig 
When I compile this code I get stack overflow printed in the console. 
Anyone know why?


---
int fact(int X)() {
if(X == 0) {
return 1;
} else {
int temp = fact!(X - 1)();
return X * temp;
}
}

const someVar = fact!(0)();
---

Re: Why do I get stack overflow?

2009-05-24 Thread Christopher Wright 

Ary Borenszweig wrote:
When I compile this code I get stack overflow printed in the console. 
Anyone know why?


---
int fact(int X)() {
if(X == 0) {
return 1;
} else {
int temp = fact!(X - 1)();
return X * temp;
}
}

const someVar = fact!(0)();
---


Like Moritz said. You need to use static if there rather than if.

Re: Why do I get stack overflow?

2009-05-24 Thread Moritz Warning 
On Sun, 24 May 2009 20:49:53 -0300, Ary Borenszweig wrote:

 When I compile this code I get stack overflow printed in the console.
 Anyone know why?
 
 ---
 int fact(int X)() {
   if(X == 0) {
   return 1;
   } else {
   int temp = fact!(X - 1)();
   return X * temp;
   }
 }
 
 const someVar = fact!(0)();
 ---

Because you generate fact!(-1)(), fact!(-2)() and so on at compile time.
You recursive template doesn't terminate.

Re: Why do I get stack overflow?

2009-05-24 Thread Ary Borenszweig 

Moritz Warning escribió:

On Sun, 24 May 2009 20:49:53 -0300, Ary Borenszweig wrote:


When I compile this code I get stack overflow printed in the console.
Anyone know why?

---
int fact(int X)() {
if(X == 0) {
return 1;
} else {
int temp = fact!(X - 1)();
return X * temp;
}
}

const someVar = fact!(0)();
---


Because you generate fact!(-1)(), fact!(-2)() and so on at compile time.
You recursive template doesn't terminate.


Thanks. Later in my head I instantiated the template and noticed the 
problem.