strange "for" statement.
by Chris "Dark" Evans · in Torque Game Engine · 03/07/2002 (6:10 pm) · 5 replies
In terrCollision.cc under TerrainBlock::castRayI there is a for statement:
for(;;) = very strange.
What does that mean? I've never seen anything like that. What's the point of having a "for" if it doesn't really do anything?
I did a search through the code and found a bunch more like that. Can someone refresh my memory as to why one would use that?
for(;;)
{
F32 nextXInt = calcInterceptX(pStart.x, invDeltaX, blockX + (dx == 1));
F32 nextYInt = calcInterceptY(pStart.y, invDeltaY, blockY + (dy == 1));
//...for(;;) = very strange.
What does that mean? I've never seen anything like that. What's the point of having a "for" if it doesn't really do anything?
I did a search through the code and found a bunch more like that. Can someone refresh my memory as to why one would use that?
#2
Old-time C programmers use for(;;) {...}
Converted Pascal programmers often get caught using while(1) {...} or while(TRUE) {...}
or
do {...} while (TRUE);
etc. etc.
03/07/2002 (6:25 pm)
Nothing strange about it at all, it's one way of implementing an infinite loop. Somewhere in the loop there will be code that jumps from it, somehow.Old-time C programmers use for(;;) {...}
Converted Pascal programmers often get caught using while(1) {...} or while(TRUE) {...}
or
do {...} while (TRUE);
etc. etc.
#3
03/07/2002 (6:58 pm)
For a more in depth information on what it means, as you know a for statement has 3 parameters separated by a ;. Well what that's saying is that it doesn't have any parameters in it, which in effect creates an infinite loop.
#5
03/07/2002 (8:18 pm)
some people call for (;;) "forever" 
Torque Owner Matt W