operator overloading ?

[bluatigro]

it is some time ago that i used lazarus
for a project

i want to create a single3d class whit operator overloading
for my openGL project's

how do i proceed ?
somthing like this ?

Code: [Select]

class TS3D
var
   x , y , z : single ;
end ;


[furious programming]

Somethig like this:

Code: Pascal  [Select][+][-]

1. type
2.   TS3D = class
3.     X, Y, Z: Single;
4.   end;

Operator overloading – read this.

[Thaddy]

A record is likely faster:

Code: Pascal  [Select][+][-]

1. type
2.   TS3D = record
3.     X, Y, Z: Single;
4.   end;

[User137]

Steap ahead of you, unless you want to reinvent the wheel 

https://github.com/Zaflis/nxpascal/blob/master/src/nxMath.pas#L395
The nxMath3D deals with 3D vectors and matrices.

[furious programming]

A record is likely faster: […]

And less functional, the more if we need to have a collection in the form of a generic list. Because this is possible:

Code: Pascal  [Select][+][-]

1. type
2.   TS3D = class
3.     X, Y, Z: Single;
4.   end;
5.  
6. type
7.   TS3DList = specialize TFPGObjectList<TS3D>;
8.  
9. var
10.   List: TS3DList;
11. begin
12.   List := TS3DList.Create();
13.   List.Add(TS3D.Create);
14.  
15.   List[0].X := 5.0;
16.   {..}

but this not:

Code: Pascal  [Select][+][-]

1. type
2.   TS3D = record
3.     X, Y, Z: Single;
4.   end;
5.  
6. type
7.   TS3DList = specialize TFPGList<TS3D>;
8.  
9. var
10.   List: TS3DList;
11. begin
12.   List := TS3DList.Create();
13.   List.Add(Default(TS3D));
14.  
15.   List[0].X := 5.0; // Error: Argument cannot be assigned to
16.   {..}

It's okay if several records are needed, but with all their collections, either record or a generic list must be abandoned.