C rtlib sorting question...

[Dr_Davenstein]

I know nothing about this, but I read somewhere on this forum that it's nice & fast.

Is it possible to sort a udt array with it. I want to use it to sort the drawing order for a billboarding projectile engine.

I have a small udt...

Code:

Type Projectile_Sort
   Dist as Single
   Id as Integer
End Type

Dim Projectile(Num_Projectiles) as Projectile_Sort

Is there a way to make QSort swap both elements when Dist(i)<Dist(j)? Ummm... Like this...

Code:

Swap Dist(i), Dist(j)
Swap Id(i), Id(j)

Is there a way that I can make QSort do that?

[v3cz0r]

Sure, qsort() takes a callback as argument, so it can be used with pretty much any kind of data, ie (untested):

Code:

function ProjectileCompare cdecl (byref elm1 as Projectile, byref elm2 as Projectile ) as integer

  function = sgn( elm1.dist - elm2.dist )

end function

qsort( myarray, arrayitems, len( Projectile ), @ProjectileCompare )