Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Programming
»
General
»
operator overloading ?
Free Pascal
Website
Downloads
Wiki
Documentation
Bugtracker
Mailing List
Lazarus
Website
Downloads (Laz+FPC)
Packages (OPM)
FAQ
Wiki
Documentation (RTL/FCL/LCL)
Bugtracker
CCR Bugs
IRC channel
GIT
Mailing List
Other languages
Foundation
Website
Useful Wiki Links
Project Roadmap
Getting the Source
Screenshots
How to use the forum
About donations (wiki)
Bookstore
Computer Math and Games in Pascal
(preview)
Lazarus Handbook
Search
Advanced search
Recent
Demo Scene Bitmap Font Sc...
by
circular
[
Today
at 06:53:32 pm]
Your best UI design - con...
by
circular
[
Today
at 06:48:12 pm]
Web Applications with Pas...
by
1HuntnMan
[
Today
at 06:44:00 pm]
splitting an image
by
Dzandaa
[
Today
at 06:40:45 pm]
Converting a string/index...
by
1HuntnMan
[
Today
at 06:35:19 pm]
Debugger error
by
Martin_fr
[
Today
at 06:06:12 pm]
Drawing grid lines on a t...
by
KodeZwerg
[
Today
at 05:42:19 pm]
Compile/Convert Delphi pr...
by
Martin_fr
[
Today
at 05:29:03 pm]
Lazarus features in a non...
by
Lutz Mändle
[
Today
at 05:26:34 pm]
what's difference between...
by
egsuh
[
Today
at 05:24:24 pm]
Lazarus for Windows on aa...
by
msintle
[
Today
at 05:03:57 pm]
AI, NLP and CAI: Text Gen...
by
indydev
[
Today
at 04:51:00 pm]
Parameter passing odditie...
by
KodeZwerg
[
Today
at 03:41:49 pm]
How to: create DLL file f...
by
KodeZwerg
[
Today
at 03:24:20 pm]
Surf Units in Text Mode I...
by
mosquito
[
Today
at 01:58:21 pm]
Ho Ho Ho IntraWeb in Laza...
by
Thaddy
[
Today
at 01:55:52 pm]
Generics - correct syntax
by
Thaddy
[
Today
at 01:48:32 pm]
FpDebug questions
by
440bx
[
Today
at 01:22:53 pm]
leetcode doesn’t support ...
by
codeninja
[
Today
at 01:16:43 pm]
Can function be used for ...
by
Joanna
[
Today
at 12:48:19 pm]
Access violation when ope...
by
Чебурашка
[
Today
at 12:14:30 pm]
Access violation when re-...
by
Chris Osborne
[
Today
at 11:43:49 am]
how to tweek fpmake to co...
by
marcov
[
Today
at 10:35:11 am]
Why isn't TTIRadioGroup's...
by
egsuh
[
Today
at 08:09:35 am]
(Solved) TIndexedAVLTree ...
by
lainz
[April 23, 2024, 10:49:03 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: operator overloading ? (Read 1895 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: 14391
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.
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Programming
»
General
»
operator overloading ?
TinyPortal
© 2005-2018