Re: Assocative array lookup for object
On Wednesday, 12 April 2023 at 01:16:17 UTC, Chris Katko wrote:
Should I be using opEquals? Or something different? The problem
with 'alias this' here is I want to wrap access to the insides
with getter functions that do various things like logging and
error checking.
I think you want to do an encapsulation like below.
```d
class Handler(T)
{
T*[string] data;
auto set(string key, ref T value)
=> data[key] =
auto opIndex(string key)
=> *(key in data);
}
void main()
{
class Bitmap {}
Bitmap foo;
auto handler = new Handler!Bitmap;
handler.set("D Lang", foo);
assert(handler["D Lang"] == );
}
```
SDB@79
Re: Assocative array lookup for object
You want the operator overload opIndex inside your class. https://dlang.org/spec/operatoroverloading.html#array
Assocative array lookup for object
```D
class bitmapHandler
{
bitmap*[string] bmps;
void get(string name){return bmps[name]; /* plus other code */}
}
void usage()
{
bitmapHandler bh;
bitmap foo = bh.get("bar"); // works
bitmap foo2 = bh["bar"]; // desired
}
```
Should I be using opEquals? Or something different? The problem
with 'alias this' here is I want to wrap access to the insides
with getter functions that do various things like logging and
error checking.
I mean, if I ruined some encapsulation, I could make a function
called "bh" and have the usage:
```D
bh("bar");
```
and have it access a singleton object.
Re: How to setup D with SFML? (using bindbc-sfml)
On Tuesday, 11 April 2023 at 11:55:50 UTC, Richard (Rikki) Andrew Cattermole wrote: I have to ask this since nothing else has worked and the dll's on the site don't depend on a MSVC dll: What are you compiling your program as? 32bit/64bit x86? ARM? Which DLL's are you downloading? 32bit, 64bit? I uses the default settings. DUB should compile my project as 64bit on Windows 10. The bindings I downloaded are also 64bit. The links mentioned in my previous post is what I use.
Re: mutable pointers as associative array keys
On Monday, 10 April 2023 at 20:31:43 UTC, Steven Schveighoffer wrote: On 4/10/23 4:25 PM, Steven Schveighoffer wrote: It's also completely useless. Having const keys does nothing to guarantee unchanging keys. Another half-assed attempt to be encode correct semantics but fails completely in its goal. In case you wonder how old this is: https://issues.dlang.org/show_bug.cgi?id=11477 https://issues.dlang.org/show_bug.cgi?id=12491#c2 -Steve Oh dear.
learning D as your first language but having difficulty in making or logic building in order to make software
I want to make software like krita inkscape and my own language using D Although i previosly learned C and C++ i left it in the middle and for some reasons i dont want to learn those so i searched for alternatives and found D but there are not a lot of resources like cookbooks and videos as compared to C or C++ does anybody know any resources for making complex software in D for some practise
SO_PRIORITY
`std.socket` is missing a `SocketOption`-equivalent to `SO_PRIORITY`. Is this an intentional omission (and if so, why?), or should I try to submit a PR to add it?
Re: How to setup D with SFML? (using bindbc-sfml)
I have to ask this since nothing else has worked and the dll's on the site don't depend on a MSVC dll: What are you compiling your program as? 32bit/64bit x86? ARM? Which DLL's are you downloading? 32bit, 64bit?
Re: How to setup D with SFML? (using bindbc-sfml)
On Sunday, 9 April 2023 at 14:20:30 UTC, Mike Parker wrote:
I've tried your project out two ways, one that succeeds and one
that fails. I'm guessing you've put your 'libs' directory is
'bin/libs'. Am I right? If so, then the following should help
you.
Well, `bin/` and `libs/` are in the same directory.
When dub runs the exectuable, it sets the current working
directory to the project's root directory by default.
`setCustomLoaderPath` passes whatever you give it directly to
the system API unmodified. You've passed a relative path. By
default, the system API associates relative paths with the
current working directory.
So given a project root directory of `$ROOT`, and your
executable in `$ROOT/bin`, the system is looking for the
libraries in `$ROOT/libs` and *not* in `$ROOT/bin/libs`. If the
libs are in the former, everything loads. If they're in the
latter, then it's going to fail.
If you cd into `bin` and run the executable manually, then libs
in `$ROOT/bin/libs` will load, as your current working
directory is `bin`.
The quick fix for this is to add `"workingDirectory" : "bin"`
to your dub.json. Then your relative paths will be relative to
`$ROOT/bin/`.
I tried `bin/libs/` as well as you describe here. It did not work.
---
Actually, it is quite strange that it fails to load the
[CSFML](https://www.sfml-dev.org/download/csfml/) library dlls in
`libs/` (I download CSFML2.5) since that is what I do with
[GLFW/OpenGL](https://github.com/rillki/d-glfw-opengl-project-template) example as well for Windows 10.
**Even this fails: `loadSFMLGraphics("libs/csfml-graphics.dll")`**
I have the following structure:
```
- bin/
- libs/
- source/
- dub.json
- dub.selections.json
```
My `dub.json`:
```Json
{
"authors": [
"rillki"
],
"copyright": "Copyright © 2023, rillki",
"dependencies": {
"bindbc-sfml": "~>1.0.2"
},
"description": "D/SFML project template",
"license": "BSL",
"name": "d-sfml-project-template",
"targetPath": "bin",
"versions": [
"SFML_Audio",
"SFML_Graphics",
"SFML_Network",
"SFML_System",
"SFML_Window",
"SFML_250"
]
}
```
My `source/app.d`:
```d
module app;
import std.stdio: writeln;
import bindbc.sfml;
void main() {
version(Windows) {
import bindbc.loader;
setCustomLoaderSearchPath("libs");
}
// attempt at loading sfml
if(!loadSFML()) {
writeln("Failed to load SFML library!");
return;
}
// window dimensions
enum width = 720;
enum height = 480;
enum title = "D/SFML project";
// create window
auto window = sfWindow_create(sfVideoMode(width, height),
title.toStringz, sfWindowStyle.sfDefaultStyle, null);
scope(exit) { sfWindow_destroy(window); }
while(sfWindow_isOpen(window)) {
// process events
sfEvent event;
while(sfWindow_pollEvent(window, )) {
if(event.type == sfEventType.sfEvtClosed) {
sfWindow_close(window);
}
}
// ...
}
}
```
I will try to make it work... Meanwhile, if someones spots what I
am doing wrong, please reply to this post.
