Re: CTFE write message to console
On Thursday, 4 April 2024 at 15:43:55 UTC, Carl Sturtivant wrote:
On Thursday, 4 April 2024 at 15:07:21 UTC, Richard (Rikki)
Andrew Cattermole wrote:
Ah yes, I forgot about that particular thing, doesn't see much
use as far as I'm aware.
It should be working though.
```D
enum X = computeX("A message");
string computeX(string msg) {
auto s = "CTFE msg: ";
auto x = imported!"std.format".format("%s%s\n", s, msg);
__ctfeWrite(x);
return x;
}
void main() {
import std.stdio;
writeln(X);
}
```
Produces no output on compilation, and writes out `CTFE msg: A
message` when run.
pragma(msg, x) ?
Re: The std.file rename method fails in the docker environment.
On Wednesday, 13 March 2024 at 23:59:24 UTC, zoujiaqing wrote: On Wednesday, 13 March 2024 at 22:16:13 UTC, Sergey wrote: On Wednesday, 13 March 2024 at 21:49:55 UTC, zoujiaqing wrote: this is bug in D. It seems like a bug in Hunt-framework. And Hunt - is an abandoned project. Hunt Framework call std.file rename function. but this function can't move file from docker container to host machine. As Jonathan said, it's NOT possible to move aka rename files across different filesystems. You can NOT do that in D, in C, in Python, every language ... is a OS error. Try to copy the file, and then delete the original one. /P
Re: Would you recommend TDPL today?
On Tuesday, 16 January 2024 at 02:25:32 UTC, matheus wrote: Hi, I'm mostly a lurker in these Forums but sometimes I post here and there, my first language was C and I still use today together with my own library (A Helper) which is like a poor version of STB (https://github.com/nothings/stb). [...] I suggest also Ali book, Programming in D, is excellent [1] [1] http://ddili.org/ders/d.en/index.html
Re: macOS Sonoma Linker Issue
On Wednesday, 4 October 2023 at 07:43:29 UTC, Tuna Celik wrote: On Tuesday, 3 October 2023 at 23:55:05 UTC, confuzzled wrote: [...] I'm also suffering from the same problem. It seems to be an Xcode 15 issues, everything works fine with 14
Ideas to reduce error message size?
Hello everybody,
If a compilation error is thrown with CTFE involved, the 'called
from here' is like:
```
src/api3.d(2010): Error: uncaught CTFE exception
`object.Exception("42703: column \"system_timestamp_ms\" does not
exist. SQL: select coalesce(count(system_timestamp_ms),0) from
dev_samples where device_id = $1")`
src/api3.d(39):thrown from here
src/api3.d(49):called from here:
`checkSql(Schema("public",
src/dget/db.d(276): Error: template instance
`api3.forgeSqlCheckerForSchema!(Schema("public", **BAZILLIONS of lines**> error instantiating
```
Simple question: there's a pattern to reduce the outputted stuff
someway? Everything is related to a single struct, `Schema`, used
during compile time stuff.
Thank you,
Paolo
Re: A Programmer's Dilema: juggling with C, BetterC, D, Macros and Cross Compiling, etc.
On Monday, 1 May 2023 at 16:57:39 UTC, Dadoum wrote: On Sunday, 30 April 2023 at 17:51:15 UTC, Eric P626 wrote: But how is this possible in a cross-compiling context. I am not sure if I can do that with the D language either as pure D or better C. DMD does not seem to offer cross compiling. GDC can compile better C, but not sure mingw can compile D/betterC code. I build programs for macOS, iOS, Windows with ldc2 cross-compiling capabilities from my Linux computer, and the experience is okay, the executables are working fine but the set-up is a bit complicated, you need to copy files from the windows toolchain, copy your ldc config and edit it with some stuff, and do that at each ldc2 update. If you just need cross-architecture, then gdc is a good option since it is compiled in a lot of cross compilation toolchains. However, I never managed to build a working gdc myself with ucrt or mingw cross-compilation capabilities, it always ends up with a compiler unable to link or executables that can't be executed on Windows. Indeed, at DeepGlance we are cross-compiling and cross linking with LDC and LLVM ld.lld, from macOS to linux. I'm interested in understanding if it's feasible to use importC with ffmpeg API and cross-compile and link them.
Re: toString best practices
On Wednesday, 15 February 2023 at 12:15:18 UTC, Bastiaan Veelo
wrote:
On Thursday, 9 February 2023 at 17:49:58 UTC, Paolo Invernizzi
wrote:
```
import std.format, std.range.primitives;
struct Point(T)
{
T x, y;
void toString(W)(ref W writer, scope const ref
FormatSpec!char f) const
if (isOutputRange!(W, char))
{
put(writer, "(");
formatValue(writer, x, f);
put(writer, ", ");
formatValue(writer, y, f);
put(writer, ")");
}
}
void main(){
import std.format : format;
assert( format("%s", Point!int(1,2)) == "(1, 2)");
import std.experimental.logger;
sharedLog.infof("%s", Point!int(1,2));
}
```
Pasting this into https://run.dlang.io/, it just works. That's
for DMD 2.099, so it might be a regression -- or recent feature?
-- Bastiaan.
Hi Bastiaan,
I think the cause is in some change happened in the logger
module, I'm recompiling some code with the latest dmd frontend.
I solved it simply using the 'logX' functions at module level
instead of the sharedLog methods.
Thank you!
toString best practices
Hello everybody,
Let's assume there's an implementation of a templated struct like
this:
```
import std.format, std.range.primitives;
struct Point(T)
{
T x, y;
void toString(W)(ref W writer, scope const ref
FormatSpec!char f) const
if (isOutputRange!(W, char))
{
put(writer, "(");
formatValue(writer, x, f);
put(writer, ", ");
formatValue(writer, y, f);
put(writer, ")");
}
}
void main(){
import std.format : format;
assert( format("%s", Point!int(1,2)) == "(1, 2)");
import std.experimental.logger;
sharedLog.infof("%s", Point!int(1,2));
/+
Error: none of the overloads of template
`std.logger.core.Logger.memLogFunctions!LogLevel.info.logImplf`
are callable using argument types `!()(string, Point!int) shared`
/Users/pinver/dlang/dmd-2.102.0/osx/bin/../../src/phobos/std/logger/core.d(828,14):
Candidates are: `logImplf(int line = __LINE__, string file = __FILE__,
string funcName = __FUNCTION__, string prettyFuncName = __PRETTY_FUNCTION__,
string moduleName = __MODULE__, A...)(lazy bool condition, lazy string msg,
lazy A args)`
/Users/pinver/dlang/dmd-2.102.0/osx/bin/../../src/phobos/std/logger/core.d(876,14):
`logImplf(int line = __LINE__, string file = __FILE__,
string funcName = __FUNCTION__, string prettyFuncName = __PRETTY_FUNCTION__,
string moduleName = __MODULE__, A...)(lazy string msg, lazy A args)`
+/
}
```
What is the best way to handle also shared writers?
Thank you all,
Paolo
Re: Is @live attribute working yet?
On Sunday, 24 April 2022 at 12:21:29 UTC, elfstone wrote: On Sunday, 24 April 2022 at 11:36:29 UTC, Paolo Invernizzi wrote: On Sunday, 24 April 2022 at 09:31:40 UTC, elfstone wrote: [...] You need to use the flag `-preview=dip1021` test.d(8,30): Error: variable `test.test.p` assigning to Owner without disposing of owned value Weird, it's still not working here. I have tried the flag with dub, and dmd. You are right with 2.099.1, it seems to be included in the 2.100.0-beta.1 ... pinver@Moria test % /Users/pinver/dlang/dmd-2.099.1/osx/bin/dmd -preview=dip1021 -c -o- src/test.d pinver@Moria test % /Users/pinver/dlang/dmd-2.100.0-beta.1/osx/bin/dmd -preview=dip1021 -c -o- src/test.d src/test.d(8): Error: variable `test.test.p` assigning to Owner without disposing of owned value
Re: Is @live attribute working yet?
On Sunday, 24 April 2022 at 09:31:40 UTC, elfstone wrote:
Dub(DMD 2.099.1) builds and runs the following code without a
warning.
import std.stdio;
import core.stdc.stdlib;
@live
void test()
{
int* p = cast(int*) malloc(32);
p = cast(int*) malloc(32);
free(p);
}
void main()
{
test();
writeln("???");
}
Isn't it supposed to trigger an error according to the doc
(https://dlang.org/spec/ob.html)?
@live void test()
{
auto p = allocate();
p = allocate(); // error: p was not disposed of
release(p);
}
You need to use the flag `-preview=dip1021`
test.d(8,30): Error: variable `test.test.p` assigning to Owner
without disposing of owned value
Re: Strong typing and physical units
On Tuesday, 28 July 2020 at 11:04:00 UTC, Cecil Ward wrote:
Of course, in C I used to do something like strong typing with
an opaque type achieved by using something like typedef struct
_something {} * type1; and then I had to do casting to get back
the real type, which was unchecked but it did prevent the user
from mixing up the types type1 and type2 say as they weren’t
assignment compatible.
I would really like strong typing to be a built in feature.
Would anyone else support this?
Once upon a time, typedef was present and backed by the compiler,
but nowadays you can find it in Phobos [1], but with some quirk
...
[1] https://dlang.org/phobos/std_typecons.html#.Typedef
Re: D and Async I/O
On Monday, 11 May 2020 at 15:02:59 UTC, bauss wrote: On Monday, 11 May 2020 at 14:02:54 UTC, Russel Winder wrote: OK, so I need to create an asynchronous TCP server (not HTTP or HTTPS, this is a real server ;-) ). I think the normal response is "Use Vibe.d". However, recently I see Hunt is an alternative. Has anyone any way of choosing between the two? vibe.d is much more mature than Hunt, that would be my take on it. Also Hunt lacks documentation etc. I notice that Hunt uses it's own library eschewing all of Phobos. Is this an indicator that Phobos is not suitable for networking activity? std.socket is terrible, so yes that is an indicator. You can't even wrap something up fast in it either. Basically it's low-level while not being low-level at the same time. You have to handle __everything__ yourself pretty much. Have a look also to Martin std.io [1] and Steven iopipes [2], if you need something simple. [1] https://github.com/MartinNowak/io [2] https://code.dlang.org/packages/iopipe
Re: Pattern matching via switch?
On Sunday, 15 March 2020 at 18:52:01 UTC, Steven Schveighoffer wrote: D doesn't support this natively. The closest you can get is something akin to what aliak wrote (you would need to write something, not sure if Phobos or some package has implemented the feature), or use cascaded if statements: I've just given a fast look at the thread, so maybe I'm wrong, but this [1] should be ok for pattern matching using plain and simple Phobos ... [1] https://dlang.org/phobos/std_variant.html#.visit
Re: Cool name for Dub packages?
On Saturday, 7 March 2020 at 09:31:27 UTC, JN wrote: Do we have any cool name for Dub packages? Rust has 'crates' Crystal has 'shards' Python has 'wheels' Ruby has 'gems' Frankly, I simply hate all that shuffle around names ... it's so difficult to understand people when it's referring to them ...we already had to remember a gazillion on things, including horrible ubuntu names instead of simple numbers! :-) Packages are ... well packages! :-P /P
Re: Meta question - what about moving the D - Learn Forum to a seperate StackExchange platform?
On Friday, 18 October 2019 at 11:45:33 UTC, Seb wrote: On Friday, 18 October 2019 at 10:55:59 UTC, Martin Tschierschke wrote: [...] In the state of the D survey, there were more people in favor of StackOverflow than D.learn, but to be fair the majority voted for "I don't care" https://rawgit.com/wilzbach/state-of-d/master/report.html Maybe it's possible to simply add an up/down vote functionality to the forum only, just keeping the compatibility with the newsgroup ... It's a win/win solution!
Re: Vibe.d Error
On Friday, 18 October 2019 at 08:06:30 UTC, Vino wrote: On Thursday, 17 October 2019 at 19:02:14 UTC, Vino wrote: [...] Hi Andre, I tried install vibe.d in SUSE linux 12 SP2 and facing the below error, tried the options as per the link https://github.com/vibe-d/vibe.d/issues/1748, still no luck and the lib's are installed in the server [...] The same here on macOS Catilina ... I'm too interested in a solution for that
Re: Undefined symbol: _dyld_enumerate_tlv_storage (OSX)
On Monday, 14 October 2019 at 05:36:44 UTC, Joel wrote: On Friday, 11 October 2019 at 11:38:27 UTC, Jacob Carlborg wrote: [...] I get this since Catalina: Joel-Computer:VacSpace joelchristensen$ dub Failed to invoke the compiler dmd to determine the build platform: dyld: lazy symbol binding failed: Symbol not found: _dyld_enumerate_tlv_storage Referenced from: /usr/local/bin/dmd Expected in: /usr/lib/libSystem.B.dylib dyld: Symbol not found: _dyld_enumerate_tlv_storage Referenced from: /usr/local/bin/dmd Expected in: /usr/lib/libSystem.B.dylib Joel-Computer:VacSpace joelchristensen$ I use Home Brew (brew upgrade dmd, and brew upgrade dub) Brew is only up to 2.087.1 at the moment - John Colvin seems to be the man that mantains dmd with brew. I confirm that DMD downloaded from the official script works like charms on Catilina. You can rely on that right now ...
Re: ld errors in osx Catalina
On Wednesday, 9 October 2019 at 16:08:41 UTC, rikki cattermole wrote: On 09/10/2019 11:33 PM, David Briant wrote: [...] D as a native language links against libc, so using the system c compiler as the linker is a viable method to prevent having to look things up. Perhaps try ldc? That uses LLVM so may be better on OSX. Related: https://issues.dlang.org/show_bug.cgi?id=20019 Also those versions on homebrew look to be at least one version out of date. If ldc on homebrew doesn't work, you should try the versions on the main site (which has dmg's) https://dlang.org/download.html I confirm that ldc-1.18.0-beta2 works fine on mine Catalina, downloaded and activated with the official install script. /Paolo
Re: D on ARM laptops?
On Thursday, 4 July 2019 at 01:01:03 UTC, Nicholas Wilson wrote: On Wednesday, 3 July 2019 at 20:49:20 UTC, JN wrote: Does anyone know if and how well D works on ARM laptops (such as Chromebooks and similar)? For example this one https://www.pine64.org/pinebook/ . Can it compile D? Obviously DMD is out because it doesn't have ARM builds. Not sure about GDC. How about LDC? Haven't tried on laptops, but I can't imagine it would be too different to RasPi which LDC worked fine on. We are using LDC on Jetson boards and it's working fine ...
Re: I really don't understand DUB
On Sunday, 14 April 2019 at 20:51:10 UTC, Andre Pany wrote: On Sunday, 14 April 2019 at 19:46:41 UTC, Ron Tarrant wrote: [...] You are totally right, it should be more intuitive how to use dub. As far as I know if you do not specify in dub.json/dub.sdl what type of package you have (executable/library) dub make a guess. Is there an app.d it will default the targetType "executable", if not it will default the targetType "library". To solve your specify the targetType explicitly in your dub.sdl file. https://dub.pm/package-format-json.html#target-types Kind regards Andre The Zen of Python, rule number two: explicit is better than implicit ... I guess that just killing all that educated dub guess will turn dub into a much easier tool to grasp. - P
Error: non-shared method core.sync.condition.Condition.notify is not callable using a shared object
There's a rational behind the fact that there's not a 'shared' version of notify/wait method in Condition? Thanks, Paolo
Re: Convert output range to input range
On Saturday, 17 March 2018 at 17:51:50 UTC, John Chapman wrote: I'm trying to replace the old std.streams in my app with ranges. I'm interfacing with a networking library to which I supply a callback that when invoked provides the requested data. I write that data to an output range, but later on I need to read that data from the range too - which of course you can't do. So what I'm looking for is the range-based equivalent of a MemoryStream. I suggest you to give a fast read to this [1], reactive streams. The D implementation [2] uses as a base an output range. They are pretty good in handling time based series event, it this is your usecase... [1] http://reactivex.io [2] https://github.com/lempiji/rx /Paolo
Re: Error: out of memory
On Wednesday, 10 January 2018 at 19:21:21 UTC, Adam D. Ruppe wrote: On Wednesday, 10 January 2018 at 19:15:00 UTC, Anonymouse wrote: I don't see a 64 bit release though... might have to try to build it yourself from source using visual studio. It's a long time I don't understand why there's not a 64bit distribution... (along with a debug build of rt/phobos, btw) /Paolo
Re: private keyword dont appear to do anything
On Friday, 3 November 2017 at 23:32:52 UTC, H. S. Teoh wrote: [...] What's wrong with the introduction of another visibility attribute that behave like the C++ private? Just curious... --- Paolo
Re: Is it possible to specify the address returned by the address of operator?
On Friday, 29 September 2017 at 22:15:44 UTC, Mengu wrote: On Friday, 29 September 2017 at 02:34:08 UTC, DreadKyller wrote: [...] +1 for forum issue. +1 please...
Re: Accessing part of a struct in an easy way
On Monday, 3 July 2017 at 17:30:51 UTC, Ali Çehreli wrote: hOn 07/03/2017 10:13 AM, Paolo Invernizzi wrote: > [...] struct with > [...] I had difficulty understanding the requirements. For example, it's not clear whether you want the literal "first" and "second" names. [...] Thanks Ali, I'm doing something similar, with inout ref in the b function: I'll stick with that. Thanks again to all! /Paolo
Re: Accessing part of a struct in an easy way
On Monday, 3 July 2017 at 16:41:51 UTC, vit wrote:
On Monday, 3 July 2017 at 13:53:45 UTC, Paolo Invernizzi wrote:
[...]
//https://dpaste.dzfl.pl/d59469c264b2
import std.algorithm : map, copy, equal;
import std.range : iota;
struct Foo {
int[3] a;
string[2] b;
}
ref T first(R : T[], T)(ref R x,){return x[0];}
ref T second(R : T[], T)(ref R x){return x[1];}
void worksOnA(R : int[N], size_t N)(ref R r) {
iota(1, N+1)
.map!(x => cast(int)x*2)
.copy(r[]);
}
void worksOnB(string[] r) { }
void main(){
auto foo = Foo();
foo.a.first = 1;
foo.a.second = 2;
assert(foo.a.first == 1);
assert(foo.a.second == 2);
foo.b.second = "test";
assert(foo.b.first == "");
assert(foo.b.second == "test");
foo.a.worksOnA();
assert(foo.a[].equal([2, 4, 6]));
}
Thanks for your solution, Vic!
It's not exactly the same, as first and second should be struct
with partial fields from Foo, of different types.
/Paolo
Accessing part of a struct in an easy way
I've struct like that:
struct Foo {
int a_1; float a_2; string a_3;
string b_1; double b_2;
}
I would like to transparently access that like:
foo.a.first
foo.b.second = "baz";
with an helper like:
auto a(...) { ... }
auto b(...) { ... }
that can be used also in functions that are expecting it:
void worksOnA( ) { }
void worksOnB( ) { }
auto foo = Foo( ... )
foo.a.worksOnA();
foo.b.worksOnB();
But I'm struggling in finding a good way to do it...
Suggestions?
Thanks!
/Paolo
Re: The reason for SIGSEGV function pointer problem
On Wednesday, 7 June 2017 at 16:50:26 UTC, Russel Winder wrote: In the constructor of an object to abstract the result of a call to the C library code, the parameter is: check_frontend_t* cf You should remove the pointer here... /Paolo
Re: D and GDB
On Sunday, 4 June 2017 at 19:24:17 UTC, Basile B. wrote: On Sunday, 4 June 2017 at 18:13:41 UTC, Russel Winder wrote: [...] you have to pipe the output to ddemangle. Personally i don't know how to do this by hand since my IDE does the task automatically (http://bbasile.github.io/Coedit/widgets_gdb_commander). Also i suppose you compiled with -g -gs ? at `libdvbv5.d:140` you are calling the native `dvb_scan_transponder` in `libdvbv5.so` that's segfaulting... Try to just log the arguments values you are using there... /Paolo
Re: What is PostgreSQL driver is most stable?
On Wednesday, 15 March 2017 at 09:18:16 UTC, Suliman wrote: On Tuesday, 14 March 2017 at 13:36:04 UTC, Daniel Kozak wrote: Dne 14.3.2017 v 14:21 Daniel Kozak napsal(a): Dne 14.3.2017 v 14:13 Suliman via Digitalmars-d-learn napsal(a): I need to develop App that should work on Linux and Windows. It need PostgreSQL driver. I tried Vadim's ddbc for PostgreSQL but it's fail on x64 version of PostgreSQL and possible will not on x64 PG on Linux (I can't test it now). Could anybody advice me good driver without problems? I seen some pg-wrapers on code.dlang.ru, but do not have test all of them. ddbc works fine for me s/ddbc/ddb/ Am I rightn understand that DBRow! is allow to get only single row, and if I need array of rows I need to use foreach? If I am wrong could you provide an example please. The retrieval of records is done via the execution of a (prepared) sql query, that returns a range object (PGResultSet), and the element of that range is the DBRow, in one of its form. So, basically, the elements are retrieved on demand while you popFront that range, leveraging what the PostgreSQL stream protocol provide. --- Paolo
Re: What is PostgreSQL driver is most stable?
On Wednesday, 15 March 2017 at 08:50:11 UTC, Dsby wrote: On Tuesday, 14 March 2017 at 16:24:31 UTC, Paolo Invernizzi wrote: On Tuesday, 14 March 2017 at 13:32:31 UTC, Suliman wrote: On Tuesday, 14 March 2017 at 13:21:39 UTC, Paolo Invernizzi wrote: On Tuesday, 14 March 2017 at 13:13:31 UTC, Suliman wrote: [...] I'm using ddb [1], a full-D implementation of the PostgreSQL protocol. Not everything it's in place, but it does its works, and the codebase is pretty simple, so it's not difficult to contribute if you need to add some feature that's missing for your use case. [1] https://github.com/pszturmaj/ddb --- Paolo Does it work fine on Linux with x64 Postgres? Yes --- Paolo We used dpq. http://code.dlang.org/packages/dpq I'm curious: ddb does not support yet arbitrary precision numbers [1], does dpq support them? Thanks, Paolo [1] https://www.postgresql.org/docs/9.5/static/datatype-numeric.html#DATATYPE-NUMERIC-DECIMAL
Re: What is PostgreSQL driver is most stable?
On Tuesday, 14 March 2017 at 13:32:31 UTC, Suliman wrote: On Tuesday, 14 March 2017 at 13:21:39 UTC, Paolo Invernizzi wrote: On Tuesday, 14 March 2017 at 13:13:31 UTC, Suliman wrote: [...] I'm using ddb [1], a full-D implementation of the PostgreSQL protocol. Not everything it's in place, but it does its works, and the codebase is pretty simple, so it's not difficult to contribute if you need to add some feature that's missing for your use case. [1] https://github.com/pszturmaj/ddb --- Paolo Does it work fine on Linux with x64 Postgres? Yes --- Paolo
Re: What is PostgreSQL driver is most stable?
On Tuesday, 14 March 2017 at 13:13:31 UTC, Suliman wrote: I need to develop App that should work on Linux and Windows. It need PostgreSQL driver. I tried Vadim's ddbc for PostgreSQL but it's fail on x64 version of PostgreSQL and possible will not on x64 PG on Linux (I can't test it now). Could anybody advice me good driver without problems? I seen some pg-wrapers on code.dlang.ru, but do not have test all of them. I'm using ddb [1], a full-D implementation of the PostgreSQL protocol. Not everything it's in place, but it does its works, and the codebase is pretty simple, so it's not difficult to contribute if you need to add some feature that's missing for your use case. [1] https://github.com/pszturmaj/ddb --- Paolo
Re: Natural sorted list of files
On Monday, 6 February 2017 at 18:57:17 UTC, Ali Çehreli wrote: On 02/06/2017 08:43 AM, Dmitry wrote: Found this https://rosettacode.org/wiki/Natural_sorting#D but there is error on ".groupBy!isDigit" (Error: no property 'groupBy' for type 'string'). I think it's now std.algorithm.chunkBy. Please fix Rosetta Code as well. Thanks! :) Ali I'm missing Bearophile... (and btw, Kenji) /P
Re: [Semi-OT] I don't want to leave this language!
On Thursday, 8 December 2016 at 11:09:12 UTC, ketmar wrote: what can be done, tho, is article (or series of articles) describing what exactly druntime is, how it is compared to libc and libc++, why it doesn't hurt at all, how to do "bare metal" with custom runtime, why GC is handy (and how to limit GC impact if that is necessary), and so on. that is something D Foundation should do, i believe. +1 /Paolo
Re: non-constant expression ["foo":5, "bar":10, "baz":2000]
On Sunday, 27 November 2016 at 22:25:51 UTC, John Colvin wrote:
On Saturday, 26 November 2016 at 17:37:57 UTC, Paolo Invernizzi
wrote:
This is stated in documentation [1]:
immutable long[string] aa = [
"foo": 5,
"bar": 10,
"baz": 2000
];
unittest
{
assert(aa["foo"] == 5);
assert(aa["bar"] == 10);
assert(aa["baz"] == 2000);
}
But results to:
Error: non-constant expression ["foo":5L, "bar":10L,
"baz":2000L]
Known bug?
If yes, Is there the need to emend the documentation, till the
bug is open?
---
/Paolo
Known bug.
If you need a workaround, initialising the variable at
load-time with `static this` should help in some cases.
Thank Joan,
The point is that I was trying to avoid some cycle between
modules, detected by 2.072.
This bug leads to pollution in the use of static this only to
workaround the limitation...
--
Paolo
Re: non-constant expression ["foo":5, "bar":10, "baz":2000]
On Saturday, 26 November 2016 at 19:57:21 UTC, Adam D. Ruppe wrote: On Saturday, 26 November 2016 at 17:37:57 UTC, Paolo Invernizzi wrote: This is stated in documentation [1]: What's the link? This is a known limitation, it has never worked. The docs should reflect that, though some day, it might start working. Sorry, I forgot to past it in the previous post: here it is. https://dlang.org/spec/hash-map.html#static_initialization -- Paolo
non-constant expression ["foo":5, "bar":10, "baz":2000]
This is stated in documentation [1]:
immutable long[string] aa = [
"foo": 5,
"bar": 10,
"baz": 2000
];
unittest
{
assert(aa["foo"] == 5);
assert(aa["bar"] == 10);
assert(aa["baz"] == 2000);
}
But results to:
Error: non-constant expression ["foo":5L, "bar":10L,
"baz":2000L]
Known bug?
If yes, Is there the need to emend the documentation, till the
bug is open?
---
/Paolo
Enumerate CTFE bug...
I'm not sure if it's the same as #15064 bug:
import std.array, std.range, std.algorithm;
immutable static foo = ["a", "b", "c"];
auto bar(R)(R r)
{
string s = r[1];
return s;
}
immutable static res = foo.enumerate.map!bar().array;
std/typecons.d(526): Error: reinterpreting cast from
inout(ulong)* to inout(Tuple!(ulong, immutable(string)))* is not
supported in CTFE
bug.d(9):called from here: r._Tuple_super()
std/algorithm/iteration.d(593):called from here:
bar(this._input.front())
std/array.d(105):called from here: __r2091.front()
bug.d(15):called from here: array(map(enumerate(foo,
0LU)))
---
Paolo
Re: test for equality of the content of two AA
On Wednesday, 26 October 2016 at 19:03:45 UTC, Ali Çehreli wrote:
On 10/26/2016 08:03 AM, Paolo Invernizzi wrote:
[...]
If you mean D's AAs, then that is already implemented:
void main() {
auto a = [ "hello" : 1, "world" : 2 ];
auto b = [ "world" : 2, "hello" : 1 ];
assert(a == b);
}
[...]
Thank you Ali, very exhaustive!
test for equality of the content of two AA
As the subject states, what is the best idiomatic way for doing that? Thanks in advance /Paolo
Re: How to kill whole application if child thread raises an exception?
On Wednesday, 26 October 2016 at 08:42:02 UTC, dm wrote:
Hi. I tried code below:
import std.concurrency;
import std.stdio;
void func()
{
throw new Exception("I'm an exception");
}
void main()
{
auto tID = spawn();
foreach(line; stdin.byLine)
send(tID, "");
}
I expect my application will die immediatly, but main thread
still running and I don't see any errors.
I want to kill all my threads if it is unhandled exception.
How can I do that?
You need to link the threads, and at least one receive after the
child thread has implicitly sent the exception to the main thread:
import std.concurrency;
import std.stdio;
---
void func()
{
throw new Exception("I'm an exception");
}
void main()
{
auto tID = spawnLinked();
receive((int dummy){});
}
---
/Paolo
Re: Reinstalled Mac
On Thursday, 29 September 2016 at 11:43:32 UTC, Jacob Carlborg wrote: Cool, what if I want to use different versions in different sessions, i.e. I have two tabs open in my terminal? Ummm... All the installed stuff is pretty well organised inside `/usr/local`, so this works... --- hw0062:~ pinver$ /usr/local/Cellar/dmd/2.071.2/bin/dmd --version DMD64 D Compiler v2.071.2 Copyright (c) 1999-2015 by Digital Mars written by Walter Bright hw0062:~ pinver$ /usr/local/Cellar/dmd/2.071./bin/dmd --version 2.071.0_1/ 2.071.1/ 2.071.2/ hw0062:~ pinver$ /usr/local/Cellar/dmd/2.071.0_1/bin/dmd --version DMD64 D Compiler v2.071.0 Copyright (c) 1999-2015 by Digital Mars written by Walter Bright --- /Paolo
Re: Reinstalled Mac
On Thursday, 29 September 2016 at 06:24:08 UTC, Jacob Carlborg wrote: On 2016-09-29 03:43, David Nadlinger wrote: I've had good experiences using Homebrew, although you sometimes have to wait a day or three for a new release to appear. — David DVM doesn't have that problem :). How easy is it to have multiple versions of DMD installed using Homebrew? It seems simple: --- hw0062:~ pinver$ brew info dmd dmd: stable 2.071.2 (bottled), HEAD D programming language compiler for OS X https://dlang.org/ /usr/local/Cellar/dmd/2.071.0_1 (561 files, 65.0M) Poured from bottle on 2016-06-23 at 14:51:10 /usr/local/Cellar/dmd/2.071.1 (561 files, 65.0M) Poured from bottle on 2016-07-06 at 09:48:40 /usr/local/Cellar/dmd/2.071.2 (561 files, 65.0M) * Poured from bottle on 2016-09-26 at 11:50:45 From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/dmd.rb hw0062:~ pinver$ dmd --version DMD64 D Compiler v2.071.2 Copyright (c) 1999-2015 by Digital Mars written by Walter Bright hw0062:~ pinver$ brew switch dmd 2.071.0_1 Cleaning /usr/local/Cellar/dmd/2.071.0_1 Cleaning /usr/local/Cellar/dmd/2.071.1 Cleaning /usr/local/Cellar/dmd/2.071.2 13 links created for /usr/local/Cellar/dmd/2.071.0_1 hw0062:~ pinver$ dmd --version DMD64 D Compiler v2.071.0 Copyright (c) 1999-2015 by Digital Mars written by Walter Bright --- /Paolo
Re: Experience report on installing dmd 2.066.1 on OSX
On Thursday, 13 November 2014 at 05:57:49 UTC, Joakim wrote: On Wednesday, 12 November 2014 at 22:38:56 UTC, Ali Çehreli wrote: A friend of mine installed dmd on OSX and recorded his experiences: http://cap-lore.com/Languages/D/Install.html I wonder why he had to do manual work like running xattr. Is that expected on OSX? Looks like they're now requiring that apps be signed with the developer's account, which I'm guessing the dmd dmg isn't: http://stackoverflow.com/questions/24176378/why-my-dmg-is-not-getting-opened-without-asking-security-popup Downloading the zip is still the most simple and easy way, IMHO... Not a single problem on 10.10... --- Paolo
Re: Dart bindings for D?
On Thursday, 30 October 2014 at 06:57:23 UTC, Ola Fosheim Grøstad wrote: There are also scripting frameworks that let you write portable code for web and mobile platforms, but they tend to be geared towards a special type of application. E.g. http://www.tidesdk.org/ http://cordova.apache.org/ http://get.adobe.com/air/ At work we are using Meteor [1] for everything related to the web products, and it's a VERY successful experience: easy to use, easy to deploy, incredible fast development timings. Right now you can also target Android/iOS, so actually you can manage everything with just plain JS. It turned to 1.0 release just yesterday, it's well funded I've bet it should be a long-runner framework. Warmly suggested. --- /Paolo [1] http://www.meteor.com
Re: Why do some language-defined attributes have @ and some not?
On Friday, 24 October 2014 at 00:37:26 UTC, Mike Parker wrote: There are people out there using D who do not participate in the newsgroups. Walter has told us before that he gets emails from companies using D in production. He has to deal with complaints about code breakage that we aren't going to see here in the NG. Just keep in mind that no matter how many of us here agree on a breaking change, we are not the entirety of the D user base. And it has nothing to do with Reddit. I think that Walter talked about emails complaining about silent breakage or regressions, and that's a totally different matter. To be honest, I only remember that he talked about one single case, but maybe I'm wrong. And I don't remember any complain about code deprecations. --- /Paolo
Re: Why do some language-defined attributes have @ and some not?
On Thursday, 23 October 2014 at 02:22:41 UTC, Jonathan M Davis wrote: On Thursday, 23 October 2014 at 00:59:26 UTC, Shriramana Sharma via Digitalmars-d-learn wrote: LOL. I understand the sentiment, but it's a waste of time. Jonathan, I agree It's impossible to debate such thing with Walter / Andrej right now, but I don't think It's a waste of time: every explicit and accountable opinion about that is a little stone to weigh in the balance. --- /Paolo
Re: Objective-C runtime: bindings are possible?
On Tuesday, 11 March 2014 at 17:22:59 UTC, Jacob Carlborg wrote: On 2014-03-11 16:12, Paolo Invernizzi wrote: Hi all, I'm wondering if it is possible to directly interface with the objective-c runtime, as I've read [1] and I have some random crashes in my code right now. Yes, it's possible since the Objective-C runtime is plain C functions. You need to show us some code to be able to help you. Someone can share some experience? I'm on 10.9... To interface with Objective-C there are three options: * Use the Objective-C runtime functions directly [1] + Works now, no language or library support is needed - Cumbersome - Verbose - Easy to make mistakes * Use an Objective-C/D bridge [2] + Fairly simple to use - Bloat, both template and virtual method bloat. We're talking 60MB Hello World * Extend the language to be ABI compatible [3, 4] + The compiler outputs the same code as the Objective-C compiler would + Easy to use (or as easy as using Objective-C would be, sometimes easier) - Requires language support I tried all of these options and personally I think the third options is the best. As of a coincident I just finished (except for exceptions) porting D/Objective-C to 64bit. [1] https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html [2] http://www.dsource.org/projects/dstep [3] http://wiki.dlang.org/DIP43 [4] https://github.com/jacob-carlborg/dmd/tree/d-objc Hi Jacob, Actually I'm using [1], that's why I was wandering about eventual problems related to objc_msgSend_stret. But I think that now the plan is to tryout [3]: that's the most logical solution after all... - Paolo
Objective-C runtime: bindings are possible?
Hi all, I'm wondering if it is possible to directly interface with the objective-c runtime, as I've read [1] and I have some random crashes in my code right now. Someone can share some experience? I'm on 10.9... Thanks, Paolo [1] http://d.puremagic.com/issues/show_bug.cgi?id=9931
Re: Pure
On Wednesday, 8 January 2014 at 19:04:24 UTC, John Colvin wrote: On Wednesday, 8 January 2014 at 18:40:46 UTC, Ola Fosheim Grøstad wrote: Is pure meant to be a compiler hint so that it is up to the programmer to enforce it? It is sometimes useful to maintain hidden state for lazy evaluation, that does not affect purity optimizations: pure is enforced by the compiler (bugs allowing...). However, D purity has more shades to it than the black and white concept that most are familiar with. I'll leave it to someone who knows better to explain it. This one is a good introduction, or at least the best one I can remember: http://klickverbot.at/blog/2012/05/purity-in-d/ Very well written, a pleasure to read. /Paolo
Re: -profile and nothrow
On Monday, 28 October 2013 at 18:34:51 UTC, Dicebot wrote: Any difference in semantics between -profile and normal flow is a bug, so, yes, please report to bugzilla. Done: http://d.puremagic.com/issues/show_bug.cgi?id=11375
Re: -profile and nothrow
Reduced:
module b;
class B {
this() {}
}
module a;
import b;
class C : B {}
class D(X) : X {}
alias D!(C) HtmlPanel;
dmd -profile a.d
Error: 'a.C.this' is not no throw
Everything is ok without the profile... may I post a bug report
for this?
/Paolo
On Monday, 28 October 2013 at 15:20:59 UTC, Paolo Invernizzi
wrote:
Hi all,
Compiling my application with 2.064.beta.4 and 2.063.2 with the
-profile switch, I have an error like:
Error: 'foo.ui.Widgets.this' is not no throw
I've read something similar involving contracts, but this seems
something different.
Of course everything compiles and run fine without the
-profile switch.
Any clue, or may I try to reduce (it is a BIG codebase)?
Thanks,
Paolo
Adaptation
Hi all,
I think this is not possible, but I'm using two different
templated libraries, and I'm wondering if there's a way of
adapting that:
module external.foo;
struct Foo { Foo[] foos }
module external.spam;
void spammer(T foolike){ foreach(s; foolike.spams){ ... } }
module mymain;
import external.foo, external.spam;
auto spams(ref Foo foo){ return foo.foos; }
void main(){
spammer(Foo()); // nope, the function is not visible in
module external.spam
}
What I'm searching is something like:
alias Foo.spams = Foo.foos;
But I guess that this is against every golden rule of good
programming...
Thanks,
---
Paolo
__FILE__ and __LINE__ again...
Johannes Pfau wrote something like this, in the logger thread:
If you write code like this:
void log(string file = __FILE__)() //A template
{
logImpl(file);
}
void logImpl(string file){} //Not a template
The compiler can always inline the log template. So there's no
template bloat as there will be effectively no instances of log.
Instead it will be inlined and logImpl will be called directly
just as
if you manually called logImpl(__FILE__).
I'm trying something like that, but with __LINE__ in addition to
put a little more pressure:
void log(string file = __FILE__, int line = __LINE__)(){
logImpl(file, line); }
void logImpl(string file, int line){}
I've then compiled a single file filled with 'log()', but I've
found from 'nm' that the text section is still full of templated
functions.
So the question is: is Johannes trick supposed to work, or
there's something I don't understand well about template
expansion and inlining?
Thanks, Paolo
Re: __FILE__ and __LINE__ again...
On Tuesday, 10 September 2013 at 16:45:33 UTC, H. S. Teoh wrote:
On Tue, Sep 10, 2013 at 06:00:53PM +0200, Paolo Invernizzi
wrote:
Johannes Pfau wrote something like this, in the logger thread:
If you write code like this:
void log(string file = __FILE__)() //A template
{
logImpl(file);
}
void logImpl(string file){} //Not a template
The compiler can always inline the log template. So there's no
template bloat as there will be effectively no instances of
log.
Instead it will be inlined and logImpl will be called directly
just as if you manually called logImpl(__FILE__).
I'm trying something like that, but with __LINE__ in addition
to put
a little more pressure:
void log(string file = __FILE__, int line = __LINE__)(){
logImpl(file, line); }
void logImpl(string file, int line){}
I've then compiled a single file filled with 'log()', but I've
found
from 'nm' that the text section is still full of templated
functions.
So the question is: is Johannes trick supposed to work, or
there's
something I don't understand well about template expansion and
inlining?
[...]
Did you compile with dmd -inline?
Having said that, if you don't have variadic arguments,
__FILE__ and
__LINE__ should be default arguments at the end of the *runtime*
argument list. Runtime arguments should be used to prevent
template
bloat:
void log(/* other arguments here */, string file=__FILE__, int
line=__LINE__)
{
...
}
If you have variadic arguments, though, this wouldn't work.
In any case, if the template function is just a thin wrapper
around
logImpl, and you're compiling with -inline, then there should
be no
runtime overhead. The compiler will still emit template
instantiations
for each call to log(), but you can get rid of this with
link-time
optimization (on Posix, you'd add -L-gc-sections to your dmd
command-line: this will cause ld to delete code sections that
are never
referenced, which includes the log() instantiations if indeed
they have
been inlined).
T
Thank you to everybody,
As you can guess, I would like to have variadic arguments: I'll
try to investigate if some mixin syntax is not too horrible to be
use...
/Paolo
SysTime and std.array.array
Hi all,
I really missing something here, because the following code is
taking two different path based on the presence or not of a field
with SysTime, where the field itself is not involved at all in
the process.
It seems that I'm using something forbidden, or something that it
is leading to an undefined behaviour, but I have not idea of what
it is the source of the problem.
Note that I'm using array() as in the original code I was using
it over a range, this is a reduction of the same problem.
Suggestions are welcome! http://dpaste.dzfl.pl/fc130984
Paolo Invernizzi
---
import std.datetime;
import std.math;
struct A
{
double i;
}
struct B
{
invariant()
{
if(j == 0)
assert(a.i.isNaN, why is 'j' zero?? and i is not
NaN?);
else
assert( ! a.i.isNaN );
}
SysTime when; // comment this line avoid the breakage
int j;
A a;
}
void main()
{
B b1 = B.init;
assert(b1); // verify that default eyes invariants are ok;
auto b2 = B(
SysTime(0, UTC()), // comment this line avoid the breakage
1, A(1));
assert(b2);
auto b3 = B(
SysTime(0, UTC()), // comment this line avoid the breakage
1, A(1)
);
assert(b3);
import std.array;
auto arr = [b2, b3];
assert(arr[0].j == 1);
assert(arr[1].j == 1);
auto a2 = arr.array(); // bang, invariant is raised, also
if b2 and b3 are good
}
--
Re: SysTime and std.array.array
On Sunday, 25 August 2013 at 19:01:14 UTC, monarch_dodra wrote: On Sunday, 25 August 2013 at 14:50:16 UTC, Paolo Invernizzi wrote: Hi all, -- I didn't fully investigate, but my guess is that you are seeing emplace bugs. Basically, *array* first allocates an array containing noise, and then tries to emplace data onto there. Unfortunatly, emplace does it wrong, calling opAssign when it shouldn't. Further, SysTime is implemented (AFAIK), as a rebindable, which has an elaborate opAssign. This means that when you call emplace, it calls opAssign, which triggers your invariant, which fails, since data is just noise. This is why commenting out that data member also avoids the bug. I'd tell you I have an open pull request that fixes it, but its been stuck without review for *months*. Thank you for the explanation, very appreciated: I've found your pull request, and I'm adding a comment pushing for an inclusion. (some bug number to vote up?) It's not easy to get familiar with ranges and templates, and that kind of bugs turns sometimes using Phobos facilities like walking in a minefields! I've another question: why the opAssign in SysTime is triggering the invariants in the enclosing struct? I mean, they nest also in this case? Thank you - Paolo Invernizzi
Re: ElementType!string
On Sunday, 25 August 2013 at 19:25:08 UTC, qznc wrote: Apparently, ElementType!string evaluates to dchar. I would have expected char. Why is that? I think is because they are iterated by ranges as dchar, that's equivalent to iterating the unicode symbol. If they were iterated by char, you would get during the iteration the singles pieces of the utf8 encoding, and usually that is not what an user is expecting. Note on the other side that static assert( is(typeof( [0]) == immutable(char)) ), so you can iterate the string by chars using the index. - Paolo Invernizzi
Re: pointers, null and Typedef...
On Saturday, 24 August 2013 at 09:19:14 UTC, John Colvin wrote: On Friday, 23 August 2013 at 18:58:49 UTC, Paolo Invernizzi wrote: On Friday, 23 August 2013 at 12:17:08 UTC, John Colvin wrote: so, here's the situation: On 2.063.2 why not something like this: It's const(void*) not just void* Unfortunately that breaks it. Sorry John, you are right, naturally. - Paolo
templated isNaN
Someone can suggest me a convenient way to declare an 'isNaN'
templated function that plays well with the 'standard.math.isNaN'?
The target is to be able to define isNaN functions for my custom
structures, and I want to keep the same name...
---
import std.math;
bool isNaN(T)(T t) if(is(T==string)){ return true; }
// that is really necessary? What if I have my isNaN in different
modules? Must duplicate?
// bool isNaN(T)(T t) if(is(T:real)) { return std.math.isNaN(t); }
void foo(){
bool b = isNaN(0.0);
}
/d471/f783.d(9): Error: template f783.isNaN does not match any
function template declaration. Candidates are:
/d471/f783.d(3):f783.isNaN(T)(T t) if (is(T == string))
/d471/f783.d(9): Error: template f783.isNaN(T)(T t) if (is(T ==
string)) cannot deduce template function from argument types
!()(double)
---
Thanks in advance!
- Paolo Invernizzi
Re: Wrapping an arbitrary class/struct API
On Saturday, 24 August 2013 at 12:12:29 UTC, Joseph Rushton
Wakeling wrote:
Hi Joseph,
I'm not really a D guru like others, but...
... an I want to wrap it in another struct, B. If I do this
manually it would be something like,
struct B
{
private A a;
void foo(int n) { return a.foo(n); }
void foo(Range)(Range r) { return a.foo(r); }
// ... etc ...
}
But suppose that I don't a priori know the list of functions
(and function arguments) that need to be wrapped. How could I
go about working this out, with a generic programming approach?
For this case I would use alias this, if you want to wrap every
method...
struct B
{
private A a;
alias a this;
}
More specifically, how could I work this out limited to a
specific function of A (say, foo) ... ?
I think that you have to explicitly wrap them, maybe with a
template to alleviate the copy/past...
But maybe someone else can suggest a better solution!
- Paolo Invernizzi
Re: Using a range as a reference
On Saturday, 24 August 2013 at 19:51:14 UTC, David wrote: do you mean refRange? http://dlang.org/phobos/std_range.html#.refRange Exactly, thank you! I've missed it as it is not listed in the tables of the range documentation, like the others, but only in the top-index... - Paolo Invernizzi
Re: Using a range as a reference
On Saturday, 24 August 2013 at 20:24:47 UTC, H. S. Teoh wrote: On Sat, Aug 24, 2013 at 10:02:56PM +0200, Paolo Invernizzi wrote: I've missed it as it is not listed in the tables of the range documentation, like the others, but only in the top-index... That would be a documentation bug. Please file a bug on http://d.puremagic.com/issues. Done: http://d.puremagic.com/issues/show_bug.cgi?id=10885 - Paolo Invernizzi
SysTime at compile time
There's a way to use a SysTime at compile-time? It seems impossible right now for the presence of the TimeZone. I want to insert some time-related fields in some structs, but I need to have some compile-time check with 'static assert' here and there... Suggestions are welcome, thanks! Paolo Invernizzi
Re: pointers, null and Typedef...
On Friday, 23 August 2013 at 12:17:08 UTC, John Colvin wrote:
so, here's the situation:
On 2.063.2 why not something like this:
---
import std.typecons;
alias T0 = Typedef!(void*, null, T0);
alias T1 = Typedef!(void*, null, T1);
static assert( ! is(T0 == T1));
struct A
{
T0 t;
this(T0 init)
{
t = init;
}
}
void foo(){
auto a = A(T0(null));
// auto b = A(T1(null)); Error!
}
---
Paolo
Re: SysTime at compile time
On Friday, 23 August 2013 at 19:07:06 UTC, Jonathan M Davis wrote:
On Friday, August 23, 2013 10:39:56 Paolo Invernizzi wrote:
There's a way to use a SysTime at compile-time? It seems
impossible right now for the presence of the TimeZone.
I want to insert some time-related fields in some structs, but
I
need to have some compile-time check with 'static assert' here
and there...
Getting the system time would require calling C functions
(which never works
in CTFE), so you can't do what you're trying to do with any
CTFE solution, let
alone SysTime. Even if there were no TimeZone, it couldn't be
done.
Thank you Jonathan, in reality I'm not interested in obtaining
the current time ('Clock.currTIme' et similia), but only in
checking some basic behaviour involving already forged times.
Something works, in a limited and constrained way, but it seems
that there's a problem with 'Rebindable' in CTFE:
---
enum t = SysTime(0, UTC());
pragma(msg, t); // SysTime(0L, Rebindable(, (UTC(UTC, UTC,
UTC
// enum t2 = t + msecs(1000); // typecons.d(956): Error: cannot
read uninitialized variable this.original in ctfe
enum d = SysTime(1000, UTC()) - SysTime(10, UTC());
pragma(msg, d); // Duration(990L)
---
Paolo Invernizzi
hash for floating
Hi all, How to implement a proper hash method for a struct/class having as a base one or more floating point? When I compile with the -w flags, dmd 2.063 tells me that the function must be size_t toHash() const nothrow @safe. The point is that the nothrow doesn't permit the std.conv.to conversions, while the @safe does not permit the cast(). So how to perform a little math on the floating and then turning the result to a proper integer hash? Suggestions welcome! Thank! Paolo Invernizzi
Re: [OT] For Andrej Mitrovic, Cairo OpenGL and Windows...
Thank you very much, Andrej Paolo On Nov 24, 2011, at 11:44 PM, Andrej Mitrovic wrote: OK, it's actually the same samples as the ones using the C API, except they've been modified to use the OOP CairoD based on a branch that added OpenGL support. In short, the link I gave you is the one you want. On 11/24/11, Andrej Mitrovic andrej.mitrov...@gmail.com wrote: Oh wait, I've just remembered I've had a branch in CairoD (the OOP wrapper) that *did* use GL, so I likely have samples for that as well. I'll take a look..
[OT] For Andrej Mitrovic, Cairo OpenGL and Windows...
Hi all, We are currently in the process of building cairo 1.10.2 for windows with the OpenGL support enabled, for using it in a D program. This evening (europe time) we probably have succeeded in the build, and tomorrow we will try some basic test of functionality. In the meantime, I've found some posts on Andrej in the cairo mailing list about the very same task: cairo, opengl, windows. Andrej (or others!) have you succeeded in having some basic example of it working? Thank you in advance, Paolo
Re: std.container ranges
On Nov 2, 2011, at 12:48 PM, Steven Schveighoffer wrote: Hello again. I've read all further replies in this thread, but it seems to me this is the most appropriate place to respond. Simply put, all of those options are too verbose. If what you want to do is simple, the syntax should also be simple, this is what I love about D. As a side-note, I don't come from Java, but I still expect a container to be able to remove an element by passing it to a method. The verbosity and the details of this operation should be hidden in the implementation of the method and I shouldn't need to know about the details. Otherwise, I could just as well implement my own container. The basic response to this is, when dealing with containers generically (that is, you know you have a container, but you don't know what type), the remove this element operation is not necessarily a good primitive to have. Simply because from the myriad of containers, only some can implement this operation efficiently. Java embeds this operation in the interface, which means any interface you have to a container could potentially use O(n) time to remove that element. Such an innocuous piece of syntax *should* have a cost if it's not efficient IMO. BTW, the original question doesn't provide enough information to say remove this element. Even in Java, if you aren't using the default comparison, you must use a comparator method to determine which one to remove. If cell.x == x cell.y == y *is* the comparison operator for the type, then the syntax gets much simpler, because you don't need to pass a specialized comparison function. In dcollections, removing a specific element (using the default comparison operator for that element) on a *fast lookup* container is as simple as: container.remove(container.find(x)); Which removes the element x if it's found. However, this is not defined for containers which use O(n) time to search (such as linked list), you must use std.algorithm.find for that: container.remove(find(container[], x).begin); Should work, and takes O(n) time. -Steve I can't really understand what is wrong with an inefficient remove this element primitive if it's really what the user had to do... Once it's in the documentation that the operation is inefficient, why the user must be forced to dig into the newsgroup to find out some code? Why can't that be furnished in a free function, for example? Cheers, Paolo
contrary of std.utf.toUTFz!(const(wchar)*)
Hi all, I feel a little stupid, but how to convert a wchar* zero terminated string into a wstring (DMD 2.055)? I'm digging into Phobos, but right now I've found no way... Thanks, Paolo
Re: Wrong const attribute?
Thank you all very much. Paolo On Sep 22, 2011, at 7:12 PM, Jonathan M Davis wrote: On Thursday, September 22, 2011 04:12 Paolo Invernizzi wrote: The error is a bit confusing but essentially correct. Bar has an immutable member variable. Once it's been initialized, that immutable member variable can never be changed, so you can never assign to a variable of type Bar. Naturally, that includes the member variable in Foo. So, when you constructed your f variable, the bar member variable was initialized, and after that, it can never be assigned to. So, when you try and do it, you get an error. The error message could definitely use some improvement though. - Jonathan M Davis
Wrong const attribute?
Hi all,
I've found nothing on bugzilla for that, what I'm missing? Or it's a bug? (DMD
2.055)
struct Bar {
immutable int i;
this(int j){ i = j; }
}
struct Foo {
Bar bar;
}
void main(){
auto b = Bar(1);
auto f = Foo();
f.bar = Bar(2); // Error: can only initialize const member bar inside
constructor
}
Cheers,
Paolo Invernizzi
Re: rdmd problems (OS X Leopard, DMD 2.052)
Hi Magnus, This is sligthly OT, but... How I loved AnyGui! It's nice to see you here, in the D bandwagon... Cheers, Paolo Invernizzi Magnus Lie Hetland Wrote: Hi! When I installed DMD 2.051 on my OS X boxen, the rdmd executable didn't work. I saw others have similar problems online, and concluded that it must have been compiled for a more recent version of OS X (Snow Leopard, I guess) without the necessary compatibility flags. I found the rdmd sources online [1] and compiled them myself. (Luckily, the other binaries work just fine.) No problems. Now I'm trying to get DMD 2.052 to work. Same issue with the rdmd executable. I tried to compile the same rdmd.d file with the new compiler/stdlib, but that failed. $ dmd rdmd.d std.contracts has been scheduled for deprecation. Please use std.exception instead. std.date and std.dateparse have been scheduled for deprecation. Please use std.datetime instead. rdmd.d(34): Error: std.regexp.split at ./../../src/phobos/std/regexp.d(498) conflicts with std.string.split at ./../../src/phobos/std/string.d(69) rdmd.d(34): Error: function std.regexp.split (string s, RegExp pattern) is not callable using argument types (string) rdmd.d(34): Error: expected 3 function arguments, not 1 I'm sure I can fix this myself -- but I'm guessing there must be a more recent version of the rdmd sources somewhere, assuming that the binary in the distribution was compiled with dmd 2.052...? The version in the trunk at dsource.org seems to be three months old... For now I just compiled the rdmd.d from dsource.org with dmd 2.051, and use that with dmd 2.052. As rdmd is basically an independent entity, I guess that should work well, but this isn't exactly user-friendly (i.e., having to replace one of the binaries in the distro with one compiled with an older compiler, using sources obtained elsewhere... :-). Not sure if I'm missing The Way to Do It[tm], or if perhaps I should submit an issue about this? [1] http://www.digitalmars.com/d/2.0/rdmd.html -- Magnus Lie Hetland http://hetland.org
Pop an element from an array inplace?
Hi all, What's the best way to find an element into an array, drop it and shrink the array inplace, in D2? Thanks in advance, Paolo
TDPL enum greet = Hello;
Hi all, On page 273 of TDPL, we have: enum euler = 2.78; euler = 2.73 // Error! Cannot modify enum value! But with D 2.047 I can do: enum greet = Hello; greet = Ciao; // Ok? So the question is, enumerated values are constant? Cheers, Paolo
