Re: Development: Work vs Lazy Programmers... How do you keep sanity?
On Thursday, 3 December 2020 at 15:18:31 UTC, matheus wrote: Hi, I didn't know where to post this and I hope this is a good place. I'm a lurker in this community and I read a lot of discussions on this forum and I think there a lot of smart people around here. So I'd like to know if any of you work with Lazy or even Dumb programmers, and If yes how do you keep your sanity? Matheus. PS: Really I'm almost losing mine. Just skip them all and do your job.
Re: How to imporve D-translation of these Python list comprehensions ?
On Monday, 15 January 2018 at 19:05:52 UTC, xenon325 wrote:
A workmate has recently shown this piece of code to show how
nice Python is (we are mostly C and growing C++ shop):
dd = [dict(_name=k, **{a + str(i): aget(d, k, a) for a in
aa for i, d in enumerate([srv1, srv2])}) for k in sorted(kk)]
This is the most terrible Python code I have ever seen.
If you know Python, could you please unroll to more readable form?
Suggestion are welcome!
---
Alexander
Re: Efficient way to pass struct as parameter
On Tuesday, 2 January 2018 at 18:45:48 UTC, Jonathan M Davis wrote: [...] Smart optimizer should think for you without any "auto" private words if function is inlined. I mean LDC compiler first of all.
Re: Why 2 ^^ 1 ^^ 2 = 2?
On Sunday, 22 October 2017 at 14:20:20 UTC, Ilya Yaroshenko wrote: .. i thought it should be (2 ^^ 1) ^^ 2 = 4 Imagine 2^^10^^10^^7. It's a big number, isn't? (up-up-and up) Where would you start from?
Re: "version" private word
On Tuesday, 31 October 2017 at 15:19:49 UTC, Steven Schveighoffer wrote: On 10/31/17 10:47 AM, Igor Shirkalin wrote: [...] Sorry I hate writing code on mobile. You can create an arbitrary version by assigning a symbol to it, use that symbol to describe a feature, assign that symbol for each architecture that supports it. Then write code in a version block of that symbol. The question was not about mobile platforms. I think he meant he didn't like writing code in a forum post on his mobile, so he wrote something more abstract :) Ah. :) Sometimes we need to mix some combinations of code in one big project with or without some libraries, algorithms etc. I see what you mean and practically agree with you. But not everything depends on you (us). The above response has been the standard D answer for as long as this question has been asked (and it has been asked a lot). Walter is dead-set against allowing boolean expressions in version statements. Now I understand the irritation about my question. I'm sorry. The anointed way is to divide your code by feature support, and then version those features in/out based on the platform you are on. For example, instead of "X86_or_X64", you would do "TryUsingSSE" or something (not sure what your specific use case is). This doesn't solve the case with combinations of different versions. Four different versions produce nine (+4) different variants. It's stupid to define 9 additional version constants. However, enums and static if can be far more powerful. Version statements do not extend across modules, so you may have to repeat the entire scaffolding to establish versions in multiple modules. Enums are accessible across modules. Yes, it's now clear for me what to do. Thanks!
Re: "version" private word
On Tuesday, 31 October 2017 at 14:54:27 UTC, Dr. Assembly wrote:
On Tuesday, 31 October 2017 at 13:53:54 UTC, Jacob Carlborg
wrote:
On 2017-10-31 14:46, Igor Shirkalin wrote:
[...]
The only alternative is to do something like this:
version (X86)
enum x86 = true;
else
enum x86 = false;
else version (X86_64)
enum x86_64 = true;
else
enum x86_64 = false;
static if (x86 || x86_64) {}
Why is that keyword called enum? is this any related to the
fact enumeration's field are const values? it would be called
invariable or something?
You're right. Enum defines constant or group of constants in
compile time.
The full description of enum can be found here:
https://dlang.org/spec/enum.html
Re: "version" private word
On Tuesday, 31 October 2017 at 14:31:17 UTC, Jesse Phillips wrote: On Tuesday, 31 October 2017 at 14:25:19 UTC, Igor Shirkalin wrote: On Tuesday, 31 October 2017 at 14:22:37 UTC, Jesse Phillips wrote: On Tuesday, 31 October 2017 at 13:46:40 UTC, Igor Shirkalin wrote: Hello! You goal should be to describe features. Version x86 ... Version = I can stand on my head ... pardon? Sorry I hate writing code on mobile. You can create an arbitrary version by assigning a symbol to it, use that symbol to describe a feature, assign that symbol for each architecture that supports it. Then write code in a version block of that symbol. The question was not about mobile platforms. Sometimes we need to mix some combinations of code in one big project with or without some libraries, algorithms etc. I see what you mean and practically agree with you. But not everything depends on you (us).
Re: "version" private word
On Tuesday, 31 October 2017 at 14:22:37 UTC, Jesse Phillips wrote: On Tuesday, 31 October 2017 at 13:46:40 UTC, Igor Shirkalin wrote: Hello! You goal should be to describe features. Version x86 ... Version = I can stand on my head ... pardon?
Re: "version" private word
On Tuesday, 31 October 2017 at 13:53:54 UTC, Jacob Carlborg wrote:
On 2017-10-31 14:46, Igor Shirkalin wrote:
Hello!
We need some conditional compilation using 'version'.
Say we have some code to be compiled for X86 and X86_64.
How can we do that using predefined (or other) versions?
Examples:
version(X86 || X86_64) // failed
version(X86) || version(X86_64) // failed
The following works but it is too verbose:
version(X86) {
version = X86_or_64;
}
version(X86_64) {
version = X86_or_64;
}
The only alternative is to do something like this:
version (X86)
enum x86 = true;
else
enum x86 = false;
else version (X86_64)
enum x86_64 = true;
else
enum x86_64 = false;
static if (x86 || x86_64) {}
Got it. Thank you!
"version" private word
Hello!
We need some conditional compilation using 'version'.
Say we have some code to be compiled for X86 and X86_64.
How can we do that using predefined (or other) versions?
Examples:
version(X86 || X86_64) // failed
version(X86) || version(X86_64) // failed
The following works but it is too verbose:
version(X86) {
version = X86_or_64;
}
version(X86_64) {
version = X86_or_64;
}
- IS
Re: the best language I have ever met(?)
On Friday, 25 November 2016 at 19:16:43 UTC, ketmar wrote: yeah. but i'm not Andrei, i don't believe that the only compiler task is to resolve templated code. ;-) i.e. Andrei believes that everything (and more) should be moved out of compiler core and done with library templates. Andrei is genius, for sure, but he is living somewhere in future, where our PCs are not bound by memory, CPU, and other silly restrictions. ;-) tl;dr: using template for this sux. Nice to meet you, Andrei! Yes, in mathematics we are more servants than gentlemen (Charles Hermite).
Re: Why do I have to cast arguments from int to byte?
On Tuesday, 10 October 2017 at 19:55:36 UTC, Chirs Forest wrote:
I keep having to make casts like the following and it's really
rubbing me the wrong way:
void foo(T)(T bar){...}
byte bar = 9;
foo!byte(bar + 1); //Error: function foo!byte.foo (byte bar) is
not callable using argument types (int)
foo!byte(cast(byte)(bar + 1));
It wouldn't be so bad if I didn't have to use the word cast
before each cast, bust since I have to specify both the word
cast and the cast type and then wrap both the cast type and the
value in brackets... it just explodes my code into multiple
lines of unreadable mess.
void foo(T)(T bar, T bar2, T bar3){...}
byte foobar = 12;
foo!byte(foobar + 1, foobar + 22, foobar + 333);
vs.
foo!byte(cast(byte)(foobar + 1), cast(byte)(foobar + 22),
cast(byte)(foobar + 333));
Why?
Because int (1) + ubyte (9) = int
Re: Create uninitialized dynamic array
On Thursday, 5 October 2017 at 21:04:30 UTC, Adam D. Ruppe wrote: On Thursday, 5 October 2017 at 19:59:48 UTC, Igor Shirkalin wrote: Is there a pure way to make what I want? oh i almost forgot about this function too: http://dpldocs.info/experimental-docs/std.array.uninitializedArray.1.html import std.array; double[] arr = uninitializedArray!(double[])(100); Ha! I saw it some day and forgot too! And GC.malloc is, I think, what I need. Thank you!
Re: Create uninitialized dynamic array
On Thursday, 5 October 2017 at 20:19:15 UTC, Adam D. Ruppe wrote:
On Thursday, 5 October 2017 at 19:59:48 UTC, Igor Shirkalin
wrote:
I want to quickly fill it with my own data and I do not want
to waste CPU time to fill it with zeros (or some other value).
You could always just allocate it yourself. Something that
large is liable to be accidentally pinned by the GC anyway, so
I suggest:
int[] data;
int* dataptr = cast(int*) malloc(SOMETHING * int.sizeof);
if(dataptr is null) throw new Exception("malloc failed");
scope(exit) free(dataptr);
data = dataptr[0 .. SOMETHING];
// work with data normally here
Just keep in mind it is freed at scope exit there, so don't
escape slices into it.
Thank you, Adam, for pinpoint answer.
Doesn't it mean we have to avoid GC for such large blocks? And
what if we need a lot blocks with less sizes? I'm from C++ world
but... I like GC.
Usually the block(s) is scoped with some more complex way, so it
is good to pass it to GC for management.
Maybe (say LDC) compiler can reject this unuseful initialization
on simplest cases.
Shortly, I'm still in doubt.
Re: Looking for a mentor in D
On Tuesday, 3 October 2017 at 06:54:01 UTC, eastanon wrote: I have been reading the D forums for a while and following on its amazing progress for a long time. Over time I have even written some basic D programs for myself, nothing major or earth shuttering. I have downloaded and read Ali's excellent book. [...] Let's try to combine D, Python and programming at isems...@gmail.com
Create uninitialized dynamic array
Hello!
Preface:
I need 1G array of ints (or anything else).
Problem:
I want to quickly fill it with my own data and I do not want to
waste CPU time to fill it with zeros (or some other value).
I do like this:
void main() {
int[] data;
// key code:
data.length = SOMETHING; // how to create an array and leave
it uninitialized?
// fill 'data' with some data
foreach(i, ref v; data) v=i; // an example
}
Is there a pure way to make what I want?
Re: Remove instance from array
On Wednesday, 5 July 2017 at 16:04:16 UTC, Jolly James wrote: On Wednesday, 5 July 2017 at 15:56:45 UTC, Igor Shirkalin wrote: On Wednesday, 5 July 2017 at 15:48:14 UTC, Jolly James wrote: On Wednesday, 5 July 2017 at 15:44:47 UTC, Igor Shirkalin wrote: On Wednesday, 5 July 2017 at 15:30:08 UTC, Jolly James wrote: WhatEver[] q = []; [...] auto i = new WhatEver(); q[] = i; How does one remove that instance 'i'? What exactly do you want to remove? After a[]=i your array contain a lot of references to 'i'. I would like to know how works: removing - the first - and all references to 'i' inside the 'q'. Perhaps, for all references to i it should look like: a = a.filter!(a => a !is i).array; Thank you! :) But why a containers so complicated in D? In C# I would go for a generic List, which would support structs and classes, where I simply could call '.Remove(T item)' or '.RemoveAt(int index)'. I would know how this works, because the method names make sense, the docs are straight forward. Here in D everything looks like climbing mount everest. When you ask how to use D's containers you are recommended to use dynamic arrays instead. When you look at the docs for std.algorithm, e.g. the .remove section, you get bombed with things like 'SwapStrategy.unstable', asserts and tuples, but you aren't told how to simply remove 1 specific element. I don't know c sharp, but I can tell everything about c++ and python. To climb a everest in python you have to know almost nothing, in c++ you have to know almost everything. In D you have to be smarter, you do not need to climb a everest but you have to know minimum to do that. Spend a year in learning and get the best result in minutes).
Re: Foreign threads in D code.
On Wednesday, 12 July 2017 at 09:49:32 UTC, Guillaume Piolat wrote: On Tuesday, 11 July 2017 at 22:59:42 UTC, Igor Shirkalin wrote: [...] -- Biotronic Thanks for very useful information! Just one small note. If you don't know the foreign thread lifetime, it's cleaner to detach it from the runtime upon exit. Else may fall in the following scenario. 1. you register thread A 2. thread A is destroyed later on, in the C++ code 3. another thread B come into your callback and allocate. The GC triggers and try to pause a non-existing thread A. This is important note. Yes, usually the lifetime of foreign thread is unknown. You, guys, helped me a lot.
Re: Foreign threads in D code.
On Tuesday, 11 July 2017 at 06:18:44 UTC, Biotronic wrote: On Monday, 10 July 2017 at 20:03:32 UTC, Igor Shirkalin wrote: [...] If DRuntime is not made aware of the thread's existence, the thread will not be stopped by the GC, and the GC might collect memory that the thread is referencing on the stack or in non-GC memory. Anything allocated by the GC would still be scanned. To inform DRuntime about your thread, you should call thread_attachThis: https://dlang.org/phobos/core_thread.html#.thread_attachThis As pointed out in the documentation of thread_attachThis, you might also want to call rt_moduleTlsCtor, to run thread local static constructors. Depending on your usage, this might not be necessary. -- Biotronic Thanks for very useful information!
Foreign threads in D code.
Hello! I have written some D code that I need to link to :C++ huge project. Let it be just one function that uses GC. The question is: if C++ code creates several threads and runs this :D function simultaneously, will GC work correctly? p.s. Of course the druntime is initialized before it. Igor Shirkalin
Re: Remove instance from array
On Wednesday, 5 July 2017 at 16:04:16 UTC, Jolly James wrote: On Wednesday, 5 July 2017 at 15:56:45 UTC, Igor Shirkalin wrote: On Wednesday, 5 July 2017 at 15:48:14 UTC, Jolly James wrote: On Wednesday, 5 July 2017 at 15:44:47 UTC, Igor Shirkalin wrote: On Wednesday, 5 July 2017 at 15:30:08 UTC, Jolly James wrote: WhatEver[] q = []; [...] auto i = new WhatEver(); q[] = i; How does one remove that instance 'i'? What exactly do you want to remove? After a[]=i your array contain a lot of references to 'i'. I would like to know how works: removing - the first - and all references to 'i' inside the 'q'. Perhaps, for all references to i it should look like: a = a.filter!(a => a !is i).array; Thank you! :) But why a containers so complicated in D? In C# I would go for a generic List, which would support structs and classes, where I simply could call '.Remove(T item)' or '.RemoveAt(int index)'. I would know how this works, because the method names make sense, the docs are straight forward. Here in D everything looks like climbing mount everest. When you ask how to use D's containers you are recommended to use dynamic arrays instead. When you look at the docs for std.algorithm, e.g. the .remove section, you get bombed with things like 'SwapStrategy.unstable', asserts and tuples, but you aren't told how to simply remove 1 specific element. I don't know c sharp, but I can tell everything about c++ and python. To climb a everest in python you have to know almost nothing, in c++ you have to know almost everything. In D you have to be smarter, you do not need to climb a everest but you have to know minimum to do that. Spend a year in learning and get the best result in minutes).
Re: Remove instance from array
On Wednesday, 5 July 2017 at 15:48:14 UTC, Jolly James wrote: On Wednesday, 5 July 2017 at 15:44:47 UTC, Igor Shirkalin wrote: On Wednesday, 5 July 2017 at 15:30:08 UTC, Jolly James wrote: WhatEver[] q = []; [...] auto i = new WhatEver(); q[] = i; How does one remove that instance 'i'? What exactly do you want to remove? After a[]=i your array contain a lot of references to 'i'. I would like to know how works: removing - the first - and all references to 'i' inside the 'q'. Perhaps, for all references to i it should look like: a = a.filter!(a => a !is i).array;
Re: Remove instance from array
On Wednesday, 5 July 2017 at 15:30:08 UTC, Jolly James wrote: WhatEver[] q = []; [...] auto i = new WhatEver(); q[] = i; How does one remove that instance 'i'? What exactly do you want to remove? After a[]=i your array contain a lot of references to 'i'.
Re: casting to structure
On Saturday, 24 June 2017 at 21:41:22 UTC, Moritz Maxeiner wrote: Hi, unfortunately not: - Operator overloading is supported via member functions only [1]. - Corollary: You cannot overload operators for builtin types (i.e. where the cast gets rewritten to `e.opOverloaded` where `e` is a builtin type) - opCast needs to be defined for the type that you are casting from [2], not the one you are casting to => You cannot overload opCast for casting from builtin types [...] You cannot. As any such cast operation would have to create a new A object, anyway (and would as such be a wrapper around a (possibly default) constructor), I suggest using elaborate constructors: Thank you for your detailed explanation! Word of warning, though: What you're doing is highly unsafe. I guess it is unsafe, but core.sys.windows module works this way. That *is* how the Windows C API works AFAIK. I have no choice except for using it as it is. Define a struct for HWND as shown above for A and use constructors. Add an `alias this` to the wrapped pointer value. That was the first thing I did. And it is led me to my question. Thank you!
Re: casting to structure
On Saturday, 24 June 2017 at 20:43:48 UTC, Igor Shirkalin wrote:
struct A
{
void * data; // void * type is just for example
// no matter what is here
}
I know that if I add constructor this(int)
struct A {
void * p;
this(int k) { p = cast(void*)k; }
}
auto a = cast(A) 23; // it works
Is it possible without such a constructor?
casting to structure
Hello!
I'm in trouble with opCast function.
Is it possible to cast some (integral) type to user defined
structure?
We have a structure:
struct A
{
void * data; // void * type is just for example
// no matter what is here
}
How can we define opCast operator to make the following
expression working properly?
auto a = cast(A) 12;
The task arised from core.sys.windows module. This module defines
a lot of windows specific types based on HANDLE: these are HWND,
HDC, HBITMAP, etc. The problem is that all these types are
identical, and it is too bad. When I redefine these types like:
alias Typedef!(void*) HDC;
I have another problem:
HWND_MESSAGE = cast(HWND) -3; // Error: cannot cast expression
-3 of type int to Typedef!(void*, null, null)
So, is there any solution to this?
Re: Simple c header => Dlang constants using mixins in compile time
On Sunday, 18 June 2017 at 16:02:38 UTC, Seb wrote: On Saturday, 17 June 2017 at 11:27:40 UTC, Igor Shirkalin wrote: On Saturday, 17 June 2017 at 11:23:52 UTC, Cym13 wrote: On Saturday, 17 June 2017 at 11:20:53 UTC, Igor Shirkalin wrote: [...] I'm sure others will have cleaner solutions as as a quick hack you can read the file at compile time, modify it, and compile the D code on the go: [...] Thanks a lot! That what I was looking for. FWIW there are tools for this as well,e.g. https://github.com/jacob-carlborg/dstep Thank you. I try to do it myself for learning purposes.
Re: Simple c header => Dlang constants using mixins in compile time
On Saturday, 17 June 2017 at 11:23:52 UTC, Cym13 wrote: On Saturday, 17 June 2017 at 11:20:53 UTC, Igor Shirkalin wrote: [...] I'm sure others will have cleaner solutions as as a quick hack you can read the file at compile time, modify it, and compile the D code on the go: [...] Thanks a lot! That what I was looking for.
Re: Simple c header => Dlang constants using mixins in compile time
On Saturday, 17 June 2017 at 11:10:47 UTC, Igor wrote: On Saturday, 17 June 2017 at 10:56:52 UTC, Igor Shirkalin wrote: Hello! I have a simple C header file that looks like: #define Name1 101 #define Name2 122 #define NameN 157 It comes from resource compiler and I need all these constants to be available in my Dlang program in compile time. It seems to me it is possible. I know I can simply write external program (in python, for example) that does it, but it means I should constantly run it after every change before D compilation. Please, can anyone help to direct me how to realize it? Thank you in advance! Igor Shirkalin Maybe I am not quite understanding what you are asking but can't you just use: enum Name1 = 101; enum Name2 = 122; ... No, I need the original header file to be used in other applications (say, resource compiler). Therefore this file is primary. I think some pretty short code can be written in D that use such a file to generate constants (enum Name1 = 101) in compile time.
Simple c header => Dlang constants using mixins in compile time
Hello! I have a simple C header file that looks like: #define Name1 101 #define Name2 122 #define NameN 157 It comes from resource compiler and I need all these constants to be available in my Dlang program in compile time. It seems to me it is possible. I know I can simply write external program (in python, for example) that does it, but it means I should constantly run it after every change before D compilation. Please, can anyone help to direct me how to realize it? Thank you in advance! Igor Shirkalin
Re: Strange expression found in std.variant
On Saturday, 3 June 2017 at 16:22:33 UTC, Francis Nixon wrote:
When looking at std.variant I found the following line:
return q{
static if (allowed!%1$s && T.allowed!%1$s)
if (convertsTo!%1$s && other.convertsTo!%1$s)
return VariantN(get!%1$s %2$s other.get!%1$s);
}.format(tp, op);
I was wondering what exactly the % signs where doing/what they
are for?
https://tour.dlang.org/tour/en/basics/alias-strings
Re: Default class template parameter
On Saturday, 27 May 2017 at 19:30:40 UTC, Stanislav Blinov wrote:
On Saturday, 27 May 2017 at 19:23:59 UTC, Igor Shirkalin wrote:
[...]
No, you'd have to at least write
auto a = new ClassName!()(1.2);
Or you could define a make function:
auto makeClassName(T = double)(T value) {
return new ClassName!T(value);
}
auto a = makeClassName(1.2);
Thank you!
Default class template parameter
Hi,
I try to make a class template with single template argument
defaulted to some type.
Is it possible to use the name of class without specification of
template argumet (no '!' operator)?
Example:
class ClassName(T=double) {
this(T value) { /// do some stuff here
}
/// some other stuff..
}
void main() {
a = ClassName(1.2); /// error: cannot deduce function from
argument types !()(int)
a = ClassName!double(1.2); /// OK
}
It seems the compiler treats 'ClassName' as function, but it is
obvious that it should treat it as 'ClassName!double'.
Re: [Semi-OT] I don't want to leave this language!
On Monday, 5 December 2016 at 20:25:00 UTC, Ilya Yaroshenko wrote: Hi e-y-e, The main problem with D for production is its runtime. GC, DRuntime, Phobos is big constraint for real world software production. The almost only thing I do is real world software production (basically math and optimized math methods). D with it's GC, DRuntime and Phobos makes it what I really like and need for. I do my own libs for my own needs. Perhaps some day I will use Mir, but I don't care if it is with or without D's standard libs. Igor Shirkalin.
Re: the best language I have ever met(?)
On Monday, 5 December 2016 at 17:27:21 UTC, Igor Shirkalin wrote: On Monday, 5 December 2016 at 16:39:33 UTC, eugene wrote: On Monday, 5 December 2016 at 16:07:41 UTC, Igor Shirkalin wrote: I didnt count, but its about ten thousend a year, i.e. nothing. if you earned nothing using D language why do you recommend it?))) People usually earn money using programming langs. some people have nothing about science. Some of them are god's addicted. I don't think D is here. We are out of here. We should go to facebook and keep here if you take it. that's it. I think we have to stop.
Re: the best language I have ever met(?)
On Monday, 5 December 2016 at 16:39:33 UTC, eugene wrote: On Monday, 5 December 2016 at 16:07:41 UTC, Igor Shirkalin wrote: I didnt count, but its about ten thousend a year, i.e. nothing. if you earned nothing using D language why do you recommend it?))) People usually earn money using programming langs. some people have nothing about science. Some of them are god's addicted. I don't think D is here. We are out of here. We should go to facebook and keep here if you take it. that's it.
Re: the best language I have ever met(?)
On Saturday, 3 December 2016 at 15:02:35 UTC, eugene wrote: On Friday, 18 November 2016 at 17:54:52 UTC, Igor Shirkalin wrote: That was preface. Now I have server written in D for C++ pretty ancient client. Most things are three times shorter in size and clear (@clear? suffix). All programming paradigms were used. I have the same text in russian, but who has bothered russian(s)? The meaning of all of that is: powerfull attractive language with sufficient infrastructure with future. Just use it. p.s. I'm excused for my primitive english. how much money did you earn using D language? I didnt count, but its about ten thousend a year, i.e. nothing. You earn ten times more of me. Ask me enything more.
Re: the best language I have ever met(?)
On Monday, 28 November 2016 at 16:15:23 UTC, Jonathan M Davis wrote: That's what pragma(inline, true) is for. And if someone wants a different solution that's completely compile-time and doesn't work with variables, then fine. I'm talking about adding something to the standard library, and for that, I think that a solution that is as close as possible to being identical to simply declaring the static array with the length is what would be appropriate. ... I'm not married to the syntax. I tried that syntax, but I couldn't figure out how to get it to work with runtime values. Can I insert my own opinion about static arrays with programmers' unknown size? Being the practical developer I can't imagine the situation where it is really needed. I hope D is not for theoretical goals only but for practical ones first. If we know the size of our future array we tell that to the compiler. If we don't know the size of our future static array we write an external generator to produce that. I really don't know places where I want static array to be unknown size inline (perhaps, except for debugging purposes). Concluding, the designer knows he's achived the perfection if there is nothing to remove, but not to add. Igor Shirkalin
Re: the best language I have ever met(?)
On Friday, 25 November 2016 at 07:17:18 UTC, MGW wrote: On Wednesday, 23 November 2016 at 18:54:35 UTC, Igor Shirkalin wrote: Igor, is the good Russian-speaking forum https://vk.com/vk_dlang. There are articles on GUI and other aspects of dlang. Thank you, I'll tale a look at it for sure.
Re: the best language I have ever met(?)
On Friday, 25 November 2016 at 14:51:52 UTC, Jonathan M Davis
wrote:
I think you may write it (I mean actual D) with using some
template like this:
auto array = static_array!uint(1, 2, 3, 4)
Could you please help to write down this template in the best
and clear manner?
That's easy. The problem is if you want it to have the same
semantics as
uint[4] arr = [1, 2, 3, 4];
In particular, VRP (Value Range Propagation) is a problem. This
compiles
ubyte[4] arr = [1, 2, 3, 4];
because each of the arguments is known to fit in a ubyte.
However, making
auto arr = staticArray!ubyte(1, 2, 3, 4);
do the same without forcing a cast is difficult. And if you
force the cast, then it's not equivalent anymore, because
something like
ubyte[4] arr = [1, 2, 3, 900];
would not compile. And surprisingly, having the function take a
dynamic array doesn't fix that problem (though maybe that's
something that we could talk the dmd devs into improving). e.g.
To mine mind it is not a problem because when you write you think
what you write (or you are right). Morover compiler will always
tell you are wrong if you make 256 to be ubyte implicity.
auto arr = staticArray!ubyte([1, 2, 3, 4]);
doesn't compile either. The most straightforward
implementations are something like
Why? Is it since [1, 2, 3, 4] is int[4] by default?
T[n] staticArray(T, size_t n)(auto ref T[n] arr)
{
return arr;
}
or
auto staticArray(Args...)(Args args)
{
CommonType!Args[Args.length] arr = [args];
return arr;
}
Great! Thank you. I should take more precise look at std.traits
but I don't know if the VRP problem is solvable or not without
some compiler improvements. If there's a clever enough
implementation to get VRP with a function like this with the
current language, I haven't figured it out yet.
- Jonathan M Davis
As I noticed, to my mind it is not a hindrance to write
deliberate things.
- Igor Shirkalin
Re: the best language I have ever met(?)
On Wednesday, 23 November 2016 at 18:58:55 UTC, ketmar wrote: We can define static array without counting the elements as following: enum array_ = [1u,2,3,4]; uint[array_.length] static_array = array_; there are workarounds, of course. yet i'll take mine `uint[$] a = [1u,2,3,4];` over that quoted mess at any time, without second thought. ;-) I think you may write it (I mean actual D) with using some template like this: auto array = static_array!uint(1, 2, 3, 4) Could you please help to write down this template in the best and clear manner?
Re: the best language I have ever met(?)
On Tuesday, 22 November 2016 at 00:08:05 UTC, ketmar wrote: On Monday, 21 November 2016 at 23:49:27 UTC, burjui wrote: Though I would argue that it's better to use '_' instead of '$' to denote deduced fixed size, it seems more obvious to me: int[_] array = [ 1, 2, 3 ]; alas, `_` is valid identifier, so `enum _ = 42; int[_] a;` is perfectly valid. dollar is simply most logical non-identifier character. We can define static array without counting the elements as following: enum array_ = [1u,2,3,4]; uint[array_.length] static_array = array_;
Re: the best language I have ever met(?)
On Saturday, 19 November 2016 at 20:54:32 UTC, ketmar wrote:
On Saturday, 19 November 2016 at 17:12:13 UTC, Igor Shirkalin
wrote:
string s = "%(%s, %)".format(a);
writefln(s);
}
Accepted.
Is it really needed to call 'writefln'? I mean 'f'.
no. it's a leftover from the code without format. it originally
was `writefln("%(%s, %)", a);`, but i wanted to show `format`
function too, and forgot to remove `f`. actually, it is a BUG
to call `writefln` here, 'cause who knows, `s` may contain '%',
and then boom! all hell broke loose. ;-)
Got it! Thanks.
Re: the best language I have ever met(?)
On Saturday, 19 November 2016 at 00:28:36 UTC, Stefan Koch wrote:
import std.stdio;
import std.format;
void main () {
uint[$] a = [42, 69];
string s = "%(%s, %)".format(a);
writefln(s);
}
Please don't post non-d.
People might use it an then complain that it does not work.
Let these people to complain. ;)
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 21:28:44 UTC, ketmar wrote:
On Friday, 18 November 2016 at 20:31:57 UTC, Igor Shirkalin
wrote:
After 2 hours of brain breaking (as D newbie) I have come to:
uint_array.map!(v=>"%x".format(v)).join(", ")
Why 2 hours? Because I have started with 'joiner' function and
aftewords found out the 'join'.
To my mind there is more simple form for this task in D (about
formatting).
sure ;-)
import std.stdio;
import std.format;
void main () {
uint[$] a = [42, 69];
string s = "%(%s, %)".format(a);
writefln(s);
}
Accepted.
Is it really needed to call 'writefln'? I mean 'f'.
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 19:47:17 UTC, H. S. Teoh wrote: On Fri, Nov 18, 2016 at 11:43:49AM -0800, H. S. Teoh via Digitalmars-d-learn wrote: [...] Yes, I meant 'sentiments' as in опыта, not as in сентметальность. :-) [...] Sorry, typo. I meant сентиментальности. But I think you understand what I mean. :-) T I Think there's a bug. When I'm answerring a message, and if my recipient send me the message, and after I press 'send' button, my message is duplicated. Simple bug to repare.
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 19:47:17 UTC, H. S. Teoh wrote: Yes, I meant 'sentiments' as in опыта, not as in сентметальность. :-) [...] Sorry, typo. I meant сентиментальности. But I think you understand what I mean. :-) Oh, I think you understand what you think what I mean :)
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 19:43:49 UTC, H. S. Teoh wrote:
I was a little bit afraid of my missunderstanding in terms of
sentiments. You've got me right (I don't quite feel the
meaning of that in these non-cyrillic letters:). But what I
understand is the path you have walked and what I have in my
mind.
Yes, I meant 'sentiments' as in опыта, not as in
сентметальность. :-)
I used to mean 'sentiments' as "сентиметальность", but "опыт -
сын ошибок трудных" (Пушкин) is what realy in behind :)
Simple example about D: I spent two hours to write a line
(borrowed from Python), related with lazy calculations, but
finally I got it with deep great thinking, and it was like
understanding of Moon alienation from Earth.
Great! Would you like to share the code snippet?
Sure. Let we have a uint_array of values. And we need to get a
string of these values in hex separated with ','. In Python it
looks like
', '.join(map(hex, uint_array))
After 2 hours of brain breaking (as D newbie) I have come to:
uint_array.map!(v=>"%x".format(v)).join(", ")
Why 2 hours? Because I have started with 'joiner' function and
aftewords found out the 'join'.
To my mind there is more simple form for this task in D (about
formatting).
What is your using of D?
Sadly, I have not been able to use D in a professional
capacity. My coworkers are very much invested into C/C++ and
have a very high level of skepticism to anything else, in
addition to resistance to adding new toolchains (much less
languages) to the current projects. So my use of D has mainly
been in personal projects. I do contribute to Phobos (the
Same here.
But my coworkers are not addicted to programming at all :)
standard library) every now and then, though. It's my way of
"contributing to the cause" in the hopes that one day D may be
more widespread and accepted by the general programming
community.
I don't hope about "D some day", I'm sure about that (5 to 30
years).
The idea is "I D", not "I C++" :)
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 19:43:49 UTC, H. S. Teoh wrote:
I was a little bit afraid of my missunderstanding in terms of
sentiments. You've got me right (I don't quite feel the
meaning of that in these non-cyrillic letters:). But what I
understand is the path you have walked and what I have in my
mind.
Yes, I meant 'sentiments' as in опыта, not as in
сентметальность. :-)
I used to mean 'sentiments' as "сентиметальность", but "опыт -
сын ошибок трудных" (Пушкин) is what realy in behind :)
Simple example about D: I spent two hours to write a line
(borrowed from Python), related with lazy calculations, but
finally I got it with deep great thinking, and it was like
understanding of Moon alienation from Earth.
Great! Would you like to share the code snippet?
Sure. We have an array of uint. And we need to get a string of
these values in hex separated with ','. In Python it looks like
', '.join(map(hex, array))
array.map!(v=>"%x".format(v)).join(", ")
[...]
What is your using of D?
For me it is tool to develope other tools.
[...]
Sadly, I have not been able to use D in a professional
capacity. My coworkers are very much invested into C/C++ and
have a very high level of skepticism to anything else, in
addition to resistance to adding new toolchains (much less
languages) to the current projects. So my use of D has mainly
been in personal projects. I do contribute to Phobos (the
standard library) every now and then, though. It's my way of
"contributing to the cause" in the hopes that one day D may be
more widespread and accepted by the general programming
community.
T
Re: the best language I have ever met(?)
On Friday, 18 November 2016 at 18:14:41 UTC, H. S. Teoh wrote: Welcome, Igor! Hello, Teoh! Your sentiments reflect mine years ago when I first discovered D. I came from a C/C++/Perl background. It was also Andrei's book that got me started; in those early days documentation was scant and I didn't know how to write idiomatic D code. But after I found TDPL, the rest was history. :-) I was a little bit afraid of my missunderstanding in terms of sentiments. You've got me right (I don't quite feel the meaning of that in these non-cyrillic letters:). But what I understand is the path you have walked and what I have in my mind. Simple example about D: I spent two hours to write a line (borrowed from Python), related with lazy calculations, but finally I got it with deep great thinking, and it was like understanding of Moon alienation from Earth. We have a few Russians on this forum, and I can understand some Russian too. Though on this mailing list English is the language to use. Sure, I don't have any doubt of it. I hope to be one of russian understandables here:) Your English is understandable. That's good enough, I think. :-) Thank you, Teoh. That is very important for me to hear. What is your using of D? For me it is tool to develope other tools. Igor
the best language I have ever met(?)
The simpler - the better. After reading "D p.l." by A.Alexandrescu two years ago I have found my past dream. It's theory to start with. That book should be read at least two times especially if you have asm/c/c++/python3/math/physics background, and dealt with Watcom/Symantec C/C++ compilers (best to Walter Bright) with very high optimization goal. No stupid questions, just doing things. That was preface. Now I have server written in D for C++ pretty ancient client. Most things are three times shorter in size and clear (@clear? suffix). All programming paradigms were used. I have the same text in russian, but who has bothered russian(s)? The meaning of all of that is: powerfull attractive language with sufficient infrastructure with future. Just use it. p.s. I'm excused for my primitive english.
