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Topic: operator overloading ? (Read 1889 times)
bluatigro
New Member
Posts: 26
everybody is diferent therefore everybody is equal
operator overloading ?
«
on:
February 19, 2019, 01:54:12 pm »
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 ;
Logged
furious programming
Hero Member
Posts: 858
Re: operator overloading ?
«
Reply #1 on:
February 19, 2019, 02:12:14 pm »
Somethig like this:
Code: Pascal
[Select]
[+]
[-]
type
TS3D
=
class
X
,
Y
,
Z
:
Single
;
end
;
Operator overloading
– read this.
Logged
Lazarus 3.2 with FPC 3.2.2, Windows 10 — all 64-bit
Working solo on an acrade, action/adventure game in retro style (pixelart), programming the engine and shell from scratch, using Free Pascal and SDL. Release planned in 2026.
Thaddy
Hero Member
Posts: 14377
Sensorship about opinions does not belong here.
Re: operator overloading ?
«
Reply #2 on:
February 19, 2019, 03:37:14 pm »
A record is likely faster:
Code: Pascal
[Select]
[+]
[-]
type
TS3D
=
record
X
,
Y
,
Z
:
Single
;
end
;
Logged
Object Pascal programmers should get rid of their "component fetish" especially with the non-visuals.
User137
Hero Member
Posts: 1791
Re: operator overloading ?
«
Reply #3 on:
February 19, 2019, 06:47:07 pm »
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.
«
Last Edit: February 19, 2019, 06:48:57 pm by User137
»
Logged
furious programming
Hero Member
Posts: 858
Re: operator overloading ?
«
Reply #4 on:
February 19, 2019, 11:14:40 pm »
Quote from: Thaddy on February 19, 2019, 03:37:14 pm
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]
[+]
[-]
type
TS3D
=
class
X
,
Y
,
Z
:
Single
;
end
;
type
TS3DList
=
specialize TFPGObjectList<TS3D>
;
var
List
:
TS3DList
;
begin
List
:
=
TS3DList
.
Create
(
)
;
List
.
Add
(
TS3D
.
Create
)
;
List
[
0
]
.
X
:
=
5.0
;
{..}
but this not:
Code: Pascal
[Select]
[+]
[-]
type
TS3D
=
record
X
,
Y
,
Z
:
Single
;
end
;
type
TS3DList
=
specialize TFPGList<TS3D>
;
var
List
:
TS3DList
;
begin
List
:
=
TS3DList
.
Create
(
)
;
List
.
Add
(
Default
(
TS3D
)
)
;
List
[
0
]
.
X
:
=
5.0
;
// Error: Argument cannot be assigned to
{..}
It's okay if several records are needed, but with all their collections, either record or a generic list must be abandoned.
Logged
Lazarus 3.2 with FPC 3.2.2, Windows 10 — all 64-bit
Working solo on an acrade, action/adventure game in retro style (pixelart), programming the engine and shell from scratch, using Free Pascal and SDL. Release planned in 2026.
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