Re: Good repos to learn D
On Sunday, 20 September 2020 at 04:27:59 UTC, H. S. Teoh wrote: On Sat, Sep 19, 2020 at 08:26:36AM +, Imperatorn via Digitalmars-d-learn wrote: What are some good examples of pretty large/medium size, good structured repos in D? I'm looking for examples to learn from [...] Phobos itself. I have to say, it's the most readable programming language standard library that I've come across. I've tried to read glibc code before, and I will never ever do that again(!). Phobos, by contrast, is a pleasure to read (except for a small number of dark corners). T Thanks! I'll take a look 🌈
Is there a way to return an lvalue and also an rvalue from the same member function?
Hi,
struct S{
int[2] array;
ref x() { return array[0]; }
auto x() const { return array[0]; }
}
If there a way to write the function 'x' into one function, not 2
overloads.
I tried auto/const/ref mindlessly :D, also remembered 'inout',
but obviously those weren't solve the problem.
(This is going to be a swizzling 'system' that mimics GLSL, later
I will make a template that takes 'x'as a template parameter,
just wondering that the support for const and non-cons can be
done easier.)
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On Sunday, 20 September 2020 at 13:30:36 UTC, realhet wrote:
Hi,
More specifically:
struct S{
int[2] array;
ref swizzle(string code)(){
static if(code=="x") return array[0];
else static if(code=="y") return array[1];
else static assert("Unhandled");
}
}
To make this work for const/immutable structs, I have to make
another function with the header: auto swizzle(string code)()
const{ copy or mixin the whole thing again... }
Maybe there is a language feature for this, like "auto ref" or
"inout"?
Thank you!
Re: DDoc generation
On Friday, 18 September 2020 at 11:41:05 UTC, Russel Winder wrote: Hi, I am trying to get to grips with DDoc for documenting an application. Getting the individual module HTML files seems to be the easy bit. The question is how to get an index.html (or equivalent) so as to have an application level entry point to the generated documentation. harbored-mod [1] generates an index with the module list (example [2]) [1] https://gitlab.com/basile.b/harbored-mod [2] https://basile.b.gitlab.io/iz/index.html
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On 9/20/20 9:30 AM, realhet wrote:
Hi,
struct S{
int[2] array;
ref x() { return array[0]; }
auto x() const { return array[0]; }
}
If there a way to write the function 'x' into one function, not 2
overloads.
I tried auto/const/ref mindlessly :D, also remembered 'inout', but
obviously those weren't solve the problem.
Your original code is an odd situation -- you want to return by ref if
it's mutable, but not if it's const?
Why not return by ref always, and just forward the constancy? This is
what inout is made to do:
ref inout(int) x() inout { return array[0]; }
(This is going to be a swizzling 'system' that mimics GLSL, later I will
make a template that takes 'x'as a template parameter, just wondering
that the support for const and non-cons can be done easier.)
If you want to differ behavior by const, but write one function, you can
use a `this` template parameter. But without seeing your real use case,
you might end up writing the same amount of code.
-Steve
Re: Building LDC runtime for a microcontroller
On Saturday, 19 September 2020 at 20:39:38 UTC, aberba wrote: On Friday, 18 September 2020 at 07:44:50 UTC, Dylan Graham wrote: On Monday, 7 September 2020 at 19:12:59 UTC, aberba wrote: [...] [...] Wow. Happy to hear this. Do you attend our monthly D online meetups? We have monthly online meetups? I would love to join of course! [...] +1 [...] I think Ali was also working on or at least talked about that OS (if I remember correctly) at Dconf, right? RTOS is a type of minimalist operating system. Was he working on something like that? I have no clue. If there is some development I'd be happy to contribute.
Re: Building LDC runtime for a microcontroller
On 9/20/20 10:51 AM, Dylan Graham wrote: On Saturday, 19 September 2020 at 20:39:38 UTC, aberba wrote: Do you attend our monthly D online meetups? We have monthly online meetups? I would love to join of course! Happening next weekend! 🍻 https://forum.dlang.org/post/rjjcl4$30sm$1...@digitalmars.com Would love to hear about your work! -Steve
Re: Building LDC runtime for a microcontroller
On Saturday, 19 September 2020 at 23:22:50 UTC, IGotD- wrote: On Friday, 18 September 2020 at 07:44:50 UTC, Dylan Graham wrote: I use D in an automotive environment (it controls parts of the powertrain, so yeah there are cars running around on D) on various types of ARM Cortex M CPUs, I think this will be the best way to extend D to those platforms. Do I dare to ask what brand of cars that are running D code. Maybe you're supplier that sells products to several car brands. Nah, I'm an aftermarket upgrades designer and manufacturer. My products only target Holden Commodores since I'm still quite small.
Re: Building LDC runtime for a microcontroller
On Sunday, 20 September 2020 at 15:13:25 UTC, Steven Schveighoffer wrote: On 9/20/20 10:51 AM, Dylan Graham wrote: On Saturday, 19 September 2020 at 20:39:38 UTC, aberba wrote: Do you attend our monthly D online meetups? We have monthly online meetups? I would love to join of course! Happening next weekend! 🍻 https://forum.dlang.org/post/rjjcl4$30sm$1...@digitalmars.com Would love to hear about your work! -Steve Thank you so much!
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On Sunday, 20 September 2020 at 14:54:09 UTC, Steven
Schveighoffer wrote:
On 9/20/20 9:30 AM, realhet wrote:
ref inout(int) x() inout { return array[0]; }
This doesn't work when I type:
v.x++;
I want to make a similar type like the GLSL vectors. Where the
following thing is valid:
vec4 a, b;
a.yzw = b.xzy;
On the left there is a contiguous area of the vector a. It just
starts form the 1th element, not form the 0th: a[1..4]. It could
be work as an lvalue.
On the right there is a non-contiguous swizzle: [b.x, b.z, b.y].
But because it is 3 element wide, it can be assigned to the
lvalue "a.yzw". This value cannot be an lvalue because the order
of the elements are not the same as in memory. So it must
returned as a const.
Here's what I achieved so far:
private enum swizzleRegs = ["xyzw", "rgba", "stpq"]; //vector,
color, and texture component letters
struct Vec(CT, int N)
if(N>=2 && N<=4){
alias VectorType = typeof(this);
alias ComponentType = CT;
enum VectorTypeName = ComponentTypePrefix ~ "vec" ~ N.text;
CT[N] array = [0].replicate(N).array; //default is 0,0,0, not
NaN. Just like in GLSL.
alias array this;
enum length = N;
...
static foreach(regs; swizzleRegs)
static foreach(len; 1..N+1)
static foreach(i; 0..N-len+1)
static if(len==1){
1)mixin(format!"auto %s() const { return array[%s];
}"(regs[i], i));
2)mixin(format!"ref %s() { return array[%s];
}"(regs[i], i));
}else{
3)mixin(format!"auto %s() const { return Vec!(CT,
%s)(array[%s..%s]); }"(regs[i..i+len], len, i, i+len));
4)mixin(format!"ref %s() { return *(cast(Vec!(CT,
%s)*) (array[%s..%s])); }"(regs[i..i+len], len, i, i+len));
}
}
So what I feel, the mixin()-s are a bit nasty :D But sufficient
for the following two criteria:
1. immutable vec3 a; a.xy.writeln; // displays a const vec2
casting a constant memory lovation to vec2 -> 3)
2. vec3 b; b.g++; // accessing the 2. component(g=green,
1based) of a vec3 with a memory reference because it is mutable.
I only want lvalues from swizzle combinations that are adjacent
in memory, so I can cast them. For all the rest I'm using
opDispatch(string def)() with a strict constraint on the string
'def'.
For example: a. returns vec4(a.x, a.x, a.x, a.x);
a.x01z returns vec4(a.x, a.0, a.1, a.z);
The only thing I don't want to implement from the GLSL spec is
those non-contigous swizzle assignments like:
a.zyx = vec3(1,2,3) ***
but
a.xyz = vec3(1,2,3) should work.
*** maybe with a struct that refers to the original vector and
the swizzle code it could be also possible. :D
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On Sunday, 20 September 2020 at 15:52:49 UTC, realhet wrote:
On Sunday, 20 September 2020 at 14:54:09 UTC, Steven
Schveighoffer wrote:
On 9/20/20 9:30 AM, realhet wrote:
I managed to do the constant swizzles and it seems so elegant:
auto opDispatch(string def)() const
if(validRvalueSwizzle(def)) //making sure that only the few
thousand valid swizzles can pass through here
{
static if(def.startsWith('_')){ //if the swizzle definition
starts with a number
return opDispatch!(def[1..$]);
}else{
Vec!(CT, mixin(def.length)) res;
static foreach(i, ch; def)
res[i] = mixin(ch); // ch can be one of xyzw or rgba or
stpq or 0 or 1.
// just mix it in using the already
created lvalue swizzles of (integer consts 01)
return res;
}
}
I also have an idea that if I use capital letters, it shoud mean
negative components. This way importing a 3d vertex could be so
easy in compile time: rotated = original.xZy -> this is rotated
90 degrees around the x axis. Just need to add an uppercase check.
Never dared to go that far in compile time dlang stuff, and I
love it. :D Amazing language!
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On 9/20/20 11:52 AM, realhet wrote:
On Sunday, 20 September 2020 at 14:54:09 UTC, Steven Schveighoffer wrote:
On 9/20/20 9:30 AM, realhet wrote:
ref inout(int) x() inout { return array[0]; }
This doesn't work when I type:
v.x++;
It should, as long as v is mutable.
I want to make a similar type like the GLSL vectors. Where the following
thing is valid:
vec4 a, b;
a.yzw = b.xzy;
This should be straight-up opDispatch I would think. You might need a
helper return that reroutes the correct items.
The only thing I don't want to implement from the GLSL spec is those
non-contigous swizzle assignments like:
a.zyx = vec3(1,2,3) ***
but
a.xyz = vec3(1,2,3) should work.
What you could do, in this case, is make your return type either a
helper type that uses a slice of the original, or one that contains a
copy of the data in the right order, but is not assignable.
*** maybe with a struct that refers to the original vector and the
swizzle code it could be also possible. :D
Yeah, I think this might work.
-Steve
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On Sunday, 20 September 2020 at 16:18:19 UTC, Steven Schveighoffer wrote: On 9/20/20 11:52 AM, realhet wrote: On Sunday, 20 September 2020 at 14:54:09 UTC, Steven Schveighoffer wrote: On 9/20/20 9:30 AM, realhet wrote: Yeah, I think this might work. -Steve That would be a 3rd category out if 4 in total: - ref for the contiguous subVectors (vec4.init.yz is a vec2) - const for the complicated ones (vec4.init.z0 is a vec2, 2nd component is 0) - swizzled struct of a referenced vector: (vec4 a; a.yx is a struct that links to the original 'a' by reference and know it has to swap x and y). - everything else that can contain any vector component at any place including constants 0 and 1. I've learned this kind of swizzling in the good old CAL/AMD_IL times. Swizzled struct is on the righr: then it should be implicitly casted when assigning it to the left to a vector. I gotta learn that too. In GLSL this behavior is implemented deeply in the compiler. I'm so happy in D it seems also possible :D
Re: Is there a way to return an lvalue and also an rvalue from the same member function?
On Sunday, 20 September 2020 at 17:08:49 UTC, realhet wrote: On Sunday, 20 September 2020 at 16:18:19 UTC, Steven Schveighoffer wrote: On 9/20/20 11:52 AM, realhet wrote: On Sunday, 20 September 2020 at 14:54:09 UTC, Steven Schveighoffer wrote: On 9/20/20 9:30 AM, realhet wrote: Yeah, I think this might work. https://gist.github.com/run-dlang/4b4d4de81c20a082d72eb61307db2946 Here's a little example. In the main() there are the requirements. Below that is the implementation. If it is ugly, please tell me how to make it prettier :D Once I was able to make the compiler for a really long time, so I know it is rather templates than explicit mixins. All the swizzles that cover a contiguous area are mixed in though: in a 4 element vector it is: only a few elements: "x", "y", "z", "w", "xy", "yz", "zw", "xyz", "yzw", "xyzw", "r", "g", "b", "a", "rg", "gb", "ba", "rgb", "gba", "rgba", "s", "t", "p", "q", "st", "tp", "pq", "stp", "tpq", "stpq" For everything there is opDispatch.
dub sub-projects
Hello. I wonder what the best-practice is for dub projects with sub-projects. Excuse me if the terminology is wrong. Let me explain my situation. I have a library which I want to split up into multiple projects. The main project will be a "wrapper" with some additional code. The sub-projects will be their own GitHub project, and the main project will have the sub-projects in its dependencies list (although I am unsure if this is the correct approach with dub). The way I imagine it all is that the main project uses code from the sub-projects and connects them together (hence the reason why I want a main project). The sub-projects will be completely separated to (hopefully) enforce non-spaghetti code. They would also be able to be developed independently from the rest of the code. I am unsure what the dub file would look like. I read that there is something called "subPackages", but in my mind I see them as dependencies. Is "subPackages" the right approach here? My last wondering is what the module name would be for the sub-packages would be. I want the project naming convention to be: - project - project-foo - project-bar But if I were to go with "dependencies" route, the correct (I believe) module name would be - "project-foo.xxx" - "project-bar.xxx" , while I would want it to be - "project.foo.xxx" - "project.bar.xxx"
Re: dub sub-projects
On Sunday, 20 September 2020 at 18:24:31 UTC, Vladimirs Nordholm wrote: Hello. I wonder what the best-practice is for dub projects with sub-projects. Excuse me if the terminology is wrong. Let me explain my situation. ... The project I am referring to is my project scone (https://github.com/vladdeSV/scone), which is a wrapper for terminal input/output. I want to separate the input and output parts into own GitHub projects. The naming conventions for these projects would be - scone - scone-input - scone-output
Re: dub sub-projects
On 21/09/2020 6:24 AM, Vladimirs Nordholm wrote: I am unsure what the dub file would look like. I read that there is something called "subPackages", but in my mind I see them as dependencies. Is "subPackages" the right approach here? Yes but no. Normally all of these (what appear to be small but highly related code ) would go in the single repository which is when you would use subPackages. But since you insist on them being separate repositories, then they are just regular old dependencies.
Re: dub sub-projects
On Sunday, 20 September 2020 at 18:55:39 UTC, rikki cattermole wrote: But since you insist on them being separate repositories, then they are just regular old dependencies. Ah, well it's not that I _insist_ on them being their own dependencies, it's just the only way I've encountered a setup like this.
Re: vibe.d: How to get the conent of a file upload ?
On Sunday, 20 September 2020 at 00:36:30 UTC, Adam D. Ruppe wrote: [...] I browsed in your arsd docs a bit and I'll have a closer look at the CGI module a bit later. Your http2 module piqued my interest as it could come in handy some time later :) Looks like your modules cover everything I need and requiring only 2 or 3 modules that cover everything I would use from vibe beats fighting with dub and vibe's complexity - and I can use a simple makefile :) That alone will save a ton of time.
