On Monday, 2 December 2013 at 13:42:48 UTC, Dfr wrote:
Hi
I searched through various D documentation sources and did not
found anything except 'std.copy', but it's only for slices.
Is there such feature in standart library ? Or some easy way to
clone for example map of slices of maps or an obj
On Sunday, 17 November 2013 at 10:56:16 UTC, Jonathan M Davis
wrote:
I think that the typical approach at this point is to just drop
purity for the
moment, but if you want you really want it, you are indeed
going to have to
implement it yourself. But we'll get there with Phobos
eventually. Th
On Tuesday, 12 November 2013 at 16:34:30 UTC, bearophile wrote:
Daniel Davidson:
Yes, but that is only giving the dates. I want the actual
array elements. Suppose S is a large object with lots of extra
fields in addition to `string foo`. There should be a way to
pull out the lower bound
On Tuesday, 12 November 2013 at 15:51:53 UTC, bearophile wrote:
Daniel Davidson:
Is there a way to search an array I know is ordered by date by
only supplying date?
You can use a map to perform a projection:
import std.stdio, std.range, std.datetime, std.algorithm,
std.array
The following code works for finding the lower bound based on
needle. But I have to create a needle which I don't want to do.
How can I use lowerBound with just the sortKey, date in this
case? So I want to do something like the following - but it
won't work. Is there a way to search an array I
On Tuesday, 5 November 2013 at 17:47:16 UTC, bearophile wrote:
TV[TK] mergeAAs(TK, TV)(TV[TK] aas...) {
It seems even fit for Phobos.
Bye,
bearophile
I have something I would appreciate feedback/criticism on. My
first stab at it worked, but had no support for passing in
const/immutable.
A
On Wednesday, 6 November 2013 at 21:26:09 UTC, Dicebot wrote:
On Wednesday, 6 November 2013 at 21:07:47 UTC, Gary Willoughby
wrote:
Unfortunately this still suffers the same problem in that you
need a module symbol name to do anything. I need to get all
module symbols at compile time.
You nee
On Wednesday, 6 November 2013 at 16:41:19 UTC, Gary Willoughby
wrote:
I looked at that but apparently it leaves the array in an
unsafe state.
Source:
http://forum.dlang.org/thread/iu3ll6$2d48$1...@digitalmars.com
Is that still the case? The following seems to work just fine.
Maybe Kenji h
On Wednesday, 6 November 2013 at 16:41:19 UTC, Gary Willoughby
wrote:
x.clear();
I looked at that but apparently it leaves the array in an
unsafe state.
Source:
http://forum.dlang.org/thread/iu3ll6$2d48$1...@digitalmars.com
Wow! Good to know, thanks!
On Wednesday, 6 November 2013 at 16:15:36 UTC, Gary Willoughby
wrote:
A simple request but i'm failing hard. How do i re-init an
associative array? This is obviously not the way:
import std.stdio;
void main(string[] args)
{
int[string] x;
On Friday, 1 November 2013 at 20:29:54 UTC, Jonathan M Davis
wrote:
On Friday, November 01, 2013 14:28:55 Daniel Davidson wrote:
On Thursday, 31 October 2013 at 19:39:44 UTC, Jonathan M Davis
Deep copying is not the only reason to have a postblit. Smart
pointers such as
The code below causes a crash. What is the idiomatic way to merge
associative arrays? If there is a simple version that allows the
value at a key to be clobbered by the value of the right hand
operand when there is a collision, that is a start.
import std.stdio;
void main() {
double[string]
On Friday, 1 November 2013 at 12:59:24 UTC, Gary Willoughby wrote:
I have a small test case that displays a linker error. I
wondered if this is an issue with the tool chain or whether i'm
doing something wrong.
I have a simple directory structure like this:
test/methods.d
test/test1.d
test/te
On Thursday, 31 October 2013 at 19:39:44 UTC, Jonathan M Davis
wrote:
const and postblit fundamentally don't mix, because for it to
work, you have
to violate the type system. With postblits, the struct gets
memcpied and then
the postblit constructor has the chance to mutate the resulting
object
On Friday, 1 November 2013 at 04:26:25 UTC, Ali Çehreli wrote:
You are not going to like my answer but this may be the 16-byte
struct bug. Add something to RateCurve and your code works
fine... :-/
struct RateCurve {
private immutable(DateRate)[] _data;
ubyte b; // <-- ADDED
}
I ap
The following crashes on writeln, but looks reasonable. Is some
form of initializing ctor required for RateCurve?
import std.datetime;
import std.range;
import std.stdio;
struct DateRate {
Date date;
double value = 0.0;
}
struct RateCurve {
private immutable(DateRate)[] _data;
}
struct
On Thursday, 31 October 2013 at 16:16:36 UTC, bearophile wrote:
That's wrong code, you are escaping a reference to memory (of
rc variable) allocated in the stack frame of foo(). The D
compiler is not smart enough to recognize the bug. There are
optimizations that patch and avoid this bug (lik
On Thursday, 31 October 2013 at 15:56:45 UTC, Maxim Fomin wrote:
On Thursday, 31 October 2013 at 14:03:28 UTC, Daniel Davidson
wrote:
Given this code:
import plus.tvm.rate_curve;
struct T {
RateCurve m;
}
struct S {
const(T) rc;
}
I get this error: Error: mutable method
On Thursday, 31 October 2013 at 14:28:31 UTC, bearophile wrote:
Daniel Davidson:
I get this error: Error: mutable method
plus.models.dossier.__unittestL42_1.T.__fieldPostBlit is not
callable using a const object
Related:
http://d.puremagic.com/issues/show_bug.cgi?id=4867
Bye,
bearophile
The following seems to work, but feels like luck. When foo
returns rc should be taken off the stack. If I recall, in C++
something like this would crash, but why not here?
import std.stdio;
struct RC {
this(this) { data = data.dup; }
int[] data;
}
struct T {
const(RC) *rc;
void goo() {
Given this code:
import plus.tvm.rate_curve;
struct T {
RateCurve m;
}
struct S {
const(T) rc;
}
I get this error: Error: mutable method
plus.models.dossier.__unittestL42_1.T.__fieldPostBlit is not
callable using a const object
Is this fundamentally incorrect? I abandoned i
On Tuesday, 29 October 2013 at 18:02:46 UTC, Logesh Pillay wrote:
On Sunday, 20 October 2013 at 16:08:50 UTC, bearophile wrote:
Logesh Pillay:
Thanks. Coming to D from python, I have to say D's tuples
look difficult. I'm going to see how far I can get with
structs writing my sudoku solver.
On Thursday, 24 October 2013 at 00:02:30 UTC, bearophile wrote:
Jonathan M Davis:
Progress is being made on that however (as evidenced by the
fact that format can now be pure in the beta for 2.064).
Now two of the most common "offenders" of pure/nothrow in my
high level code are iota() and a
Here is a working solution:
https://github.com/patefacio/d-help/blob/master/d-help/opmix/ut.d
Currently it only pulls in unittests at the module level. I'm
sure it will work on unittests scoped to structs/classes, I just
need to figure out how to determine if a compile time named
object is an
On Saturday, 26 October 2013 at 08:09:26 UTC, Dmitry Olshansky
wrote:
26-Oct-2013 02:36, Daniel Davidson пишет:
On Friday, 25 October 2013 at 16:43:23 UTC, Daniel Davidson
wrote:
On Friday, 25 October 2013 at 14:14:39 UTC, Dicebot wrote:
This will work starting with 2.064:
Ok. I'll
On Friday, 25 October 2013 at 16:43:23 UTC, Daniel Davidson wrote:
On Friday, 25 October 2013 at 14:14:39 UTC, Dicebot wrote:
This will work starting with 2.064:
Ok. I'll keep pressing. Here is an updated version:
http://pastebin.com/g6FWsTkr
The idea is to be able to just impo
On Friday, 25 October 2013 at 14:14:39 UTC, Dicebot wrote:
This will work starting with 2.064:
Ok. I'll keep pressing. Here is an updated version:
http://pastebin.com/g6FWsTkr
The idea is to be able to just import ut, annotate as you have
described and get unit tests run. I want to mixin th
On Friday, 25 October 2013 at 13:30:54 UTC, Dicebot wrote:
On Friday, 25 October 2013 at 13:23:46 UTC, Daniel Davidson
wrote:
What I'm missing, and apparently others in the original
thread, is a way to run tests selectively. It is difficult to
do with unittest because they are not name
On Friday, 25 October 2013 at 13:04:03 UTC, Dicebot wrote:
I strictly believe any unittest enhancing library must be built
on top of existing unittest blocks using __traits(getUnittest)
and be 100% compatible with normal `-unittest` mode
I don't disagree. What exactly does that mean and what w
I've been through this thread:
http://forum.dlang.org/post/mailman.1454.1369104411.4724.digitalmar...@puremagic.com
I would like the named unittests, as describe there, but I don't
think it is in the works (if I'm wrong please let me know). So I
took an approach outlined here
(http://www.redd
enum Bar = "Bar";
@("Foo") @Bar int x;
pragma(msg, __traits(getAttributes, x));
This prints: tuple("Foo", "Bar")
How do you run code only if "Bar" is associated with a symbol
like x?
I was hoping something like this:
pragma(msg, hasAnnotation!(x, Bar));
Where getAnnotation from
(http://forum
On Wednesday, 23 October 2013 at 21:37:25 UTC, H. S. Teoh wrote:
On Wed, Oct 23, 2013 at 11:17:30PM +0200, Daniel Davidson wrote:
On Wednesday, 23 October 2013 at 20:18:39 UTC, Andrej Mitrovic
wrote:
>On 10/23/13, Daniel Davidson wrote:
>>Great, thanks. What is the best way to ge
On Wednesday, 23 October 2013 at 20:18:39 UTC, Andrej Mitrovic
wrote:
On 10/23/13, Daniel Davidson wrote:
Great, thanks. What is the best way to get on that version for
the Mac (pointer to instructions)?
You can download the beta here:
http://forum.dlang.org/thread/52605c84.6010
On Wednesday, 23 October 2013 at 19:56:26 UTC, Andrej Mitrovic
wrote:
On Wednesday, 23 October 2013 at 19:55:26 UTC, Daniel Davidson
wrote:
Should text be pure?
It's pure in 2.064, the upcoming release.
Great, thanks. What is the best way to get on that version for
the Mac (point
Should text be pure?
I have multiple enforce statements of the form:
enforce(0 == _history.length ||
!binaryFun!(orderingPred)(additional,
_history[$-1]),
text(V.stringof, " must be added in chronological
order, but ",
additional, " comes b
On Wednesday, 16 October 2013 at 21:11:19 UTC, H. S. Teoh wrote:
On Wed, Oct 16, 2013 at 10:09:50PM +0200, Daniel Davidson wrote:
[...]
I reported my issue with the `chain` function to this NG and
tried
to start annotating items used by chain with pure to see how
far the
thread led. Honestly
On Thursday, 17 October 2013 at 20:31:38 UTC, Yura wrote:
Dear D programmers,
I am very new to D programming language. I just started to
learn it as an alternative to python since the latter sometimes
is too slow. My question is whether there some simple ways to
solve linear algebra problems
On Thursday, 17 October 2013 at 18:28:31 UTC, Meta wrote:
On Thursday, 17 October 2013 at 13:08:18 UTC, Daniel Davidson
wrote:
If it would be no different then why prefer immutable(char)[]
for string?
Strings are immutable in quite a few other languages. Ex: Java,
Python. I found this old
On Wednesday, 16 October 2013 at 20:33:23 UTC, H. S. Teoh wrote:
On Wed, Oct 16, 2013 at 09:45:09PM +0200, Daniel Davidson wrote:
On Wednesday, 16 October 2013 at 19:12:48 UTC, Dicebot wrote:
[...]
>I think any usage of immutable with types/entities not
>initially
>designed for imm
If it would be no different then why prefer immutable(char)[] for
string?
On Wednesday, 16 October 2013 at 19:49:25 UTC, monarch_dodra
wrote:
On Wednesday, 16 October 2013 at 17:50:48 UTC, Daniel Davidson
wrote:
How do you propose to make a mutable copy *generically*?
You can't. Let alone generically.
If I give you an "immutable int* p", how do
On Wednesday, 16 October 2013 at 19:49:25 UTC, monarch_dodra
wrote:
On Wednesday, 16 October 2013 at 17:50:48 UTC, Daniel Davidson
wrote:
How do you propose to make a mutable copy *generically*?
You can't. Let alone generically.
If I give you an "immutable int* p", how do
On Wednesday, 16 October 2013 at 19:55:41 UTC, Simen Kjaeraas
wrote:
On 2013-10-16, 18:54, Daniel Davidson wrote:
On Thursday, 13 June 2013 at 12:29:57 UTC, Simen Kjaeraas
wrote:
On Thu, 13 Jun 2013 14:17:22 +0200, Stephan Schiffels
wrote:
For example, is there a way of instantiating an
On Wednesday, 16 October 2013 at 19:12:48 UTC, Dicebot wrote:
On Wednesday, 16 October 2013 at 19:06:06 UTC, Daniel Davidson
wrote:
I don't understand how it could be fine. As code grows it
would lead to people not adding useful members like history
just because of the huge repercus
On Wednesday, 16 October 2013 at 19:01:59 UTC, H. S. Teoh wrote:
On Wed, Oct 16, 2013 at 08:49:51PM +0200, Daniel Davidson wrote:
On Wednesday, 16 October 2013 at 17:55:14 UTC, H. S. Teoh
wrote:
>On Wed, Oct 16, 2013 at 07:23:24PM +0200, Daniel Davidson
>wrote:
[...]
>>If you have
On Wednesday, 16 October 2013 at 18:52:23 UTC, qznc wrote:
On Wednesday, 16 October 2013 at 17:55:14 UTC, H. S. Teoh wrote:
Maybe it's helpful to understand how D's const system works.
The
following diagram may help (please excuse the ASCII graphics):
const
/ \
On Wednesday, 16 October 2013 at 17:55:14 UTC, H. S. Teoh wrote:
On Wed, Oct 16, 2013 at 07:23:24PM +0200, Daniel Davidson wrote:
On Wednesday, 2 October 2013 at 13:09:34 UTC, Daniel Davidson
wrote:
[...]
>Maybe it is a philosophical question, but where does
>immutability
>really
On Wednesday, 16 October 2013 at 18:09:55 UTC, Maxim Fomin wrote:
On Wednesday, 16 October 2013 at 17:05:25 UTC, Daniel Davidson
wrote:
The code below fails to compile due to the last line. I was
hoping casting away immutable would allow the call to foo. I
think it is not accepted because of
On Wednesday, 16 October 2013 at 17:55:56 UTC, Dicebot wrote:
struct S {
R r;
this(ref immutable(T) t) immutable {
r.tupleof = t.tupleof;
}
}
?
Thanks. It is cute - but not so helpful. The example stands. I
*need* to call a createRFromT.
Their shapes are the same in this simple ex
On Wednesday, 16 October 2013 at 17:58:41 UTC, Dicebot wrote:
On Wednesday, 16 October 2013 at 17:50:48 UTC, Daniel Davidson
wrote:
On Wednesday, 16 October 2013 at 17:16:39 UTC, Dicebot wrote:
It works as it should. Make a mutable copy of t2 and pass it.
Or make foo() accept const. I can&#
On Wednesday, 16 October 2013 at 17:16:39 UTC, Dicebot wrote:
It works as it should. Make a mutable copy of t2 and pass it.
Or make foo() accept const. I can't imagine a single legitimate
use case for destroying type system in a way you want.
How do you propose to make a mutable copy *generi
On Wednesday, 2 October 2013 at 13:09:34 UTC, Daniel Davidson
wrote:
I'm reviewing Ali's insightful presentation from 2013 DConf. I
wonder has he or anyone else followed up on the concepts or
formalized some guidelines that could achieve consensus. I
definitely agree it would be
The code below fails to compile due to the last line. I was
hoping casting away immutable would allow the call to foo. I
think it is not accepted because of the rval to ref issue. If
that is the case, how can foo be called by casting?
I'm not a fan of casting but I'm finding cases where it is
On Thursday, 13 June 2013 at 12:29:57 UTC, Simen Kjaeraas wrote:
On Thu, 13 Jun 2013 14:17:22 +0200, Stephan Schiffels
wrote:
For example, is there a way of instantiating an object
normally (i.e. mutable), and then later "freeze" it to
immutable via a simple cast or so?
In std.exception th
The following code runs fine. There is a whole bunch of types
imported, so whittling it down to the problem is not too easy.
import plus.models.assumption;
import pprint.pp;
import std.stdio;
import std.datetime;
void main() {
immutable am = AssumptionModel();
writeln(pp(am));
}
That code
On Tuesday, 15 October 2013 at 13:43:55 UTC, bearophile wrote:
Daniel Davidson:
I would like to correctly annotate my functions with pure.
I've hit a function that is calling chain which breaks purity.
Is chain really not pure?
Phobos is slowly being annotated with pure/nothrow (and
I would like to correctly annotate my functions with pure. I've
hit a function that is calling chain which breaks purity. Is
chain really not pure?
The relevant section of code is:
...
auto sortedRage = assumeSorted!("a.when <
b.when")(opSlice());
auto trisection = sortedRa
On Tuesday, 15 October 2013 at 05:44:25 UTC, captaindet wrote:
hi,
i am a bit confused.
the official language ref ( http://dlang.org/hash-map.html )
states:
"
Classes can be used as the KeyType. For this to work, the class
definition must override the following member functions of
class Ob
On Thursday, 10 October 2013 at 23:12:24 UTC, qznc wrote:
The linked page clearly says "It may, however, be changed by
another reference to that same data."
usually you would think that no one else should change the
data while callee runs. but at least with c++ i could imagine
running callee
On Thursday, 10 October 2013 at 23:06:23 UTC, qznc wrote:
Maybe the fact that D allows this implicit copy to immutable is
the problem? If one could require the use of a specific
function, this function could be overridden with working
behavior. The following code works.
Yes - the issue aris
On Wednesday, 9 October 2013 at 23:05:27 UTC, qznc wrote:
On Wednesday, 9 October 2013 at 15:50:55 UTC, Daniel Davidson
wrote:
void foo(const(MutableType) mt);
void foo(immutable(MutableType) mt);
Naturally the inclination is to choose the second as it is a
stronger guarantee that no threads
On Wednesday, 9 October 2013 at 15:33:23 UTC, Ali Çehreli wrote:
That string is independent from the argument (i.e. Bar.name).
They initially share the same characters. Either of those
strings can leave this sharing at will, and that is exactly
what name="tess" does. 'name' now refers to dif
On Wednesday, 9 October 2013 at 15:46:29 UTC, Gary Willoughby
wrote:
So why does this give me an error i expect:
import std.stdio;
class Foo
{
public void change(string[] name)
{
name[0] = "tess";
On Wednesday, 9 October 2013 at 04:41:35 UTC, Ali Çehreli wrote:
On 10/08/2013 03:03 PM, qznc wrote:
> On Wednesday, 2 October 2013 at 13:09:34 UTC, Daniel Davidson
wrote:
>> 1. If a variable is never mutated, make it const, not
immutable.
>> 2. Make the parameter reference to im
On Wednesday, 9 October 2013 at 04:31:55 UTC, Ali Çehreli wrote:
On 10/08/2013 03:12 PM, qznc wrote:
> On Monday, 7 October 2013 at 17:57:11 UTC, Ali Çehreli wrote:
>> To look at just one usage example, the following line
carries two
>> requirements:
>>
>> auto a = T();
>> immutable b =
On Tuesday, 8 October 2013 at 20:26:49 UTC, Colin Grogan wrote:
On Tuesday, 8 October 2013 at 20:25:42 UTC, Colin Grogan wrote:
Hi all,
I want to create my own File in memory that I can pipe output
to and read it in from another part of the program. I dont
want to physically write data to dis
On Tuesday, 8 October 2013 at 16:24:50 UTC, Daniel Davidson wrote:
This simple script calls out to find (on a Mac). For me this
works. If I increase the output by changing maxdepth to 3 it
hangs forever. When I run the same find from the shell it is
fine. What could cause a deadlock in this
This simple script calls out to find (on a Mac). For me this
works. If I increase the output by changing maxdepth to 3 it
hangs forever. When I run the same find from the shell it is
fine. What could cause a deadlock in this and what is a
workaround?
http://pastebin.com/ji8dZwAY
Thanks
Dan
On Thursday, 12 September 2013 at 19:41:49 UTC, bearophile wrote:
Daniel Davidson:
I am using Dart for code generation but would like to consider
D if I can find a convenient replacement for the following
declarative style:
Replacing Dart with D seems quite strange, such two languages
have
On Wednesday, 2 October 2013 at 17:07:55 UTC, Ali Çehreli wrote:
On 10/02/2013 06:09 AM, Daniel Davidson wrote:
> 1. If a variable is never mutated, make it const, not
immutable.
> 2. Make the parameter reference to immutable if that is how
you will use
> it anyway. It is fine to as
I'm reviewing Ali's insightful presentation from 2013 DConf. I
wonder has he or anyone else followed up on the concepts or
formalized some guidelines that could achieve consensus. I
definitely agree it would be helpful to have a 50 Ways To Improve
Your D. The first thing I'd like to see is a se
On Sunday, 29 September 2013 at 14:31:15 UTC, linkrope wrote:
I want to pretty-print the representation of a value of a
generic type T.
In Ruby, I would use 'pp':
value = 'hello'
pp value # prints "hello" - with quotes!
value = 42
pp value # prints 42
Now, value.to!string eli
On Friday, 27 September 2013 at 11:52:46 UTC, Dicebot wrote:
That is weird. I have used some common CI platforms like
Jenkins for D projects with no issues. Those are simply
irrelevant to actual language used.
There must be something I am missing. Can you give quick
summary what drone.io is a
On Friday, 27 September 2013 at 11:22:43 UTC, Dicebot wrote:
On Thursday, 26 September 2013 at 21:08:31 UTC, Daniel Davidson
wrote:
Is there an equivalent?
Judging by link it looks like yet another continuous
integration suite, is there anything more about it you are
interested in? CI is
Is there an equivalent?
On Sunday, 22 September 2013 at 17:26:01 UTC, Ali Çehreli wrote:
You are not alone. I tried to answer some of these questions in
my DConf 2013 talk. I think I have only scratched the surface:
http://dconf.org/talks/cehreli.html
Ali
Ali, thank you for providing great feedback and suggestion
On Monday, 23 September 2013 at 03:51:41 UTC, Jonathan M Davis
wrote:
Doesn't using immutable there present the same problem as with
the slice? S is no longer assignable. But who would recommend
not
using immutable in this case if you want aarr to be stable. If
you do not use immutable then who
On Sunday, 22 September 2013 at 20:17:03 UTC, Jonathan M Davis
wrote:
If you have
struct S
{
immutable int[] arr;
}
then arr can never be assigned to, so a variable of type S can
never be
assigned to. But if you have
Yes - it (arr) can never be assigned to. That is the idea. It has
alr
In this thread
(http://forum.dlang.org/thread/uvhwkgljavskqfueq...@forum.dlang.org)
I asked this:
3) Also, is storing immutable(STUFF) in a struct in the general
case (as opposed to just this one) useful or silly?
Johnathan M Davis replied:
As soon as you have a const or immutable member i
On Thursday, 19 September 2013 at 20:05:34 UTC, Jonathan M Davis
wrote:
As soon as you have a const or immutable member in a struct,
you can't ever
assign anything to it, even if all of its other members are
mutable (you could
assign the individual, mutable members but not the whole
struct). Th
On Thursday, 19 September 2013 at 16:50:32 UTC, Namespace wrote:
cast(immutable)data) is not an lvalue, it's a rvalue. ref
accepts only lvalues.
Thanks... about the other questions?
Multi-part question:
1) Why does the last line fail? If cast to immutable how is it
different than z? I know it is related to the ref. I'm using ref
because I think it is likely more efficient - so assume the
char[16] were really char[1024].
2) If I got rid of the ref, how many copies of the
Is there any way to simulate the cascade operator (..) of Dart in
D? This operator makes fluid initialization simple.
I am using Dart for code generation but would like to consider D
if I can find a convenient replacement for the following
declarative style:
var dateRange = struct('date_
Ho do you debug D executables on mac os x in which debug symbols
are available (preferably a setup that works in emacs with gdb or
gud-gdb)?
This thread seems to bring up the issue I am seeing:
http://forum.dlang.org/thread/k55tiv$28u3$1...@digitalmars.com
but no solution is provided. Also, t
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