On Wednesday, 28 February 2018 at 17:47:22 UTC, Robert M. Münch
wrote:
Hi, I'm lost reading some code:
A a;
auto do(alias f, A)(auto ref A _a){
alias fun = unaryFun!f;
return ...
...
}
How is this alias stuff working? I mean what's the type of f?
Is it an anonymous fun
On Tuesday, 27 February 2018 at 22:17:25 UTC, Jonathan wrote:
On Tuesday, 27 February 2018 at 22:13:05 UTC, Jonathan wrote:
Is it possible to cast a 2d static length array to a 1d static
length array?
E.g.
int[2][2] a = [[1,2],[3,4]];
int[4]b = cast(int[4])a;
Is not the byte data in memor
On Sunday, 25 February 2018 at 21:35:33 UTC, ketmar wrote:
add postblit debug prints, and you will see.
I get that it will call the postblit since it creates a temporary.
What I expected though was that.
auto s = S(0).foo(1);
Would become something like:
S s; s.__ctor(0).foo(1);
But maybe
On Monday, 26 February 2018 at 20:50:35 UTC, Kayomn wrote:
I've been experimenting with D's Better C mode, and I have a
question regarding something that I started thinking about
after watching one of Jonathon Blow's talks on data-oriented
programming - more specifically the aspect of fake "inh
When writing some code to setup properties in a chain function
manner I ran into some unexpected behavior with destructors.
Example:
struct S {
int a, b;
ref S foo(int b) {
this.b = b;
return this;
}
this(int ab) {
this.a = this.b = ab;
printf("
On Saturday, 24 February 2018 at 09:48:13 UTC, Joel wrote:
I'm trying some code for practice, but it isn't working
properly - it prints just one number when printing in reverse.
I think the problem is here:
void popFront() { head = head.next; if (head !is null)
head.prev = null; }
void pop
On Thursday, 22 February 2018 at 12:50:43 UTC, ag0aep6g wrote:
On 02/22/2018 10:39 AM, bauss wrote:
On Thursday, 22 February 2018 at 05:22:19 UTC, TheFlyingFiddle
wrote:
Eg:
uint a = 3;
int b = -1;
assert(a > b); //No idea what should happen here.
This is what happens:
assert(cast(int)a >
On Thursday, 22 February 2018 at 00:34:59 UTC, kdevel wrote:
Is there a D equivalent of the C++ at method? I would like to
reformulate
repro2.d
---
void main ()
{
import std.stdio;
import std.container;
import std.range;
auto z = Array!char();
z.reserve(0xC000_);
z.capacit
On Tuesday, 14 February 2017 at 06:48:33 UTC, TheGag96 wrote:
Tonight I stumbled upon Andrei's concept of policy-based design
(https://en.wikipedia.org/wiki/Policy-based_design) and tried
to implement their example in D with the lack of multiple
inheritance in mind.
https://dpaste.dzfl.pl/adc
On Monday, 30 January 2017 at 11:03:52 UTC, Profile Anaysis wrote:
I need to yield from a complex recursive function too allow
visualizing what it is doing.
e.g., if it is a tree searching algorithm, I'd like to yield
for each node so that the current state can be shown visually.
I realize t
On Tuesday, 24 January 2017 at 21:41:12 UTC, Profile Anaysis
wrote:
On Tuesday, 24 January 2017 at 21:36:50 UTC, Profile Anaysis
wrote:
...
Maybe with all this talk of the new CTFE engine being
developed, a similar mechanism can be used optionally? This
could help with debugging also.
In d
On Tuesday, 24 January 2017 at 21:36:50 UTC, Profile Anaysis
wrote:
On Tuesday, 24 January 2017 at 16:49:03 UTC, TheFlyingFiddle
wrote:
On Tuesday, 24 January 2017 at 16:41:13 UTC, TheFlyingFiddle
wrote:
Everything turned out s much better than expected :)
Added bonus is that mixin output c
On Tuesday, 24 January 2017 at 16:41:13 UTC, TheFlyingFiddle
wrote:
Everything turned out s much better than expected :)
Added bonus is that mixin output can be viewed in the generated
files :D
On Tuesday, 24 January 2017 at 12:19:33 UTC, ketmar wrote:
On Tuesday, 24 January 2017 at 12:14:05 UTC, TheFlyingFiddle
wrote:
unittest
{
enum s = import("myfile");
}
Is there something similar to this for outputting files at
compile-time?
no. this is by design, so it won't be fixed. sorr
On Tuesday, 24 January 2017 at 12:19:33 UTC, ketmar wrote:
On Tuesday, 24 January 2017 at 12:14:05 UTC, TheFlyingFiddle
wrote:
unittest
{
enum s = import("myfile");
}
Is there something similar to this for outputting files at
compile-time?
no. this is by design, so it won't be fixed. sorr
On Tuesday, 24 January 2017 at 11:19:58 UTC, TheFlyingFiddle
wrote:
Does D have any facilities that could make this possible?
It seems that there is a feature I was unaware of/forgot called
Import Expressions.
unittest
{
enum s = import("myfile");
}
Is there something similar to this for
On Tuesday, 24 January 2017 at 11:28:17 UTC, Atila Neves wrote:
void main() {
foo;
}
void foo() @safe {
int[] array;
auto ptr = array.ptr;
}
foo.d(7): Deprecation: array.ptr cannot be used in @safe code,
use &array[0] instead
&array[0] is incredibly ugly and feels like an unnec
Context:
I am currently writing a small library that compiles sql strings
at compile-time and generates query objects.
Something like this:
unittest
{
mixin Sql!(q{
select feed.url, feed.title
from users
join user_feeds as feed
on users.id = feed.user
whe
On Wednesday, 18 January 2017 at 19:40:12 UTC, TheFlyingFiddle
wrote:
Hi
I am having problems using stored procedures that return
results.
Update: I am using the SvrCapFlags.MULTI_RESULTS flag when
initiating the connection and have also tried using the
SvrCapFlags.MULTI_STATEMENTS flag.
Hi
I am having problems using stored procedures that return results.
Example procedure:
CREATE PROCEDURE GetUsers()
SELECT * FROM users;
When I use this procedure from the MySQL command line everything
works fine. However, when I use it from the mysql-native library
i get into problems.
i
On Thursday, 27 October 2016 at 14:45:22 UTC, Gianni Pisetta
wrote:
On Thursday, 27 October 2016 at 14:34:38 UTC, TheFlyingFiddle
wrote:
On Thursday, 27 October 2016 at 14:04:23 UTC, Gianni Pisetta
wrote:
Hi all,
but at the moment isStringLiteral will return true even with
variables of type st
On Thursday, 27 October 2016 at 14:04:23 UTC, Gianni Pisetta
wrote:
Hi all,
but at the moment isStringLiteral will return true even with
variables of type string. So i searched for a metod to check if
an alias is a literal value, but found nothing. Anyone have any
clue on how can be done?
Th
On Friday, 21 October 2016 at 08:18:58 UTC, rikki cattermole
wrote:
On 21/10/2016 9:13 PM, TheFlyingFiddle wrote:
On Friday, 21 October 2016 at 07:56:27 UTC, rikki cattermole
wrote:
You're gonna have to use UDA's for that.
Yes, to do the serialization you're right.
But my usecase for this is
On Friday, 21 October 2016 at 07:56:27 UTC, rikki cattermole
wrote:
You're gonna have to use UDA's for that.
Yes, to do the serialization you're right.
But my usecase for this is for error reporting. Basically any
struct that contains unions without serialization instructions
cannot be seria
I am trying to port a serialization library I wrote in Lua some
time ago. I've ran into a problem relating to types with
anonymous unions inside.
Given this code:
enum Kind
{
none = 0,
array,
integer,
floating,
}
struct Foo
{
Kind type;
union
{
ulong integer;
On Wednesday, 12 October 2016 at 02:18:47 UTC, TheFlyingFiddle
wrote:
void foo(ref ABase base)
{
base.ival = 32;
}
This should be:
void foo(ref Base1 base)
{
base.ival = 32;
}
On Wednesday, 12 October 2016 at 01:22:04 UTC, lobo wrote:
Hi,
I'm coming from C++ and wondered if the pattern below has an
equivalent in D using structs. I could just use classes and
leave it up to the caller to use scoped! as well but I'm not
sure how that will play out when others start us
On Tuesday, 11 October 2016 at 15:46:20 UTC, orip wrote:
On Tuesday, 11 October 2016 at 13:06:37 UTC, pineapple wrote:
Rewrite `return chain(ints[0..5], ints[8..$]);` as `return
ints[0..5] ~ ints[8..$];`
The `chain` function doesn't return an array, it returns a
lazily-evaluated sequence of a
On Monday, 3 October 2016 at 11:40:00 UTC, deed wrote:
Unexpected auto-concatenation of string elements:
string[] arr = ["a", "b" "c"];// ["a", "bc"], length==2
int[] arr2 = [[1], [2] [3]];// Error: array index 3 is
out of bounds [2][0 .. 1]
// Error:
On Saturday, 1 October 2016 at 16:45:11 UTC, Uranuz wrote:
How to make rsplit (like in Python) in D without need for extra
allocation using standard library? And why there is no
algorithms (or parameter in existing algorithms) to process
range from the back. Is `back` and `popBack` somehow wors
The description in dmd help says: omit generating some runtime
information and helper functions.
What runtime information are we talking about here? My
understanding is that it's basically an experimental feature but
when (if) completed what subset of the language would still be
usable?
On Tuesday, 10 November 2015 at 10:41:52 UTC, tired_eyes wrote:
On Tuesday, 10 November 2015 at 10:33:30 UTC, Tobias Pankrath
wrote:
Ruby:
a = 1
b = 4
puts "The number #{a} is less than #{b}"
PHP:
$a = 1;
$b = 4;
echo "The number $a is less than $b";
D:
???
int a = 1, b = 4;
writefln("The nu
On Monday, 9 November 2015 at 04:52:37 UTC, rsw0x wrote:
On Monday, 9 November 2015 at 04:29:30 UTC, Rikki Cattermole
wrote:
Fwiw, EMSI provides high quality containers backed by
std.experimental.allocator.
https://github.com/economicmodeling/containers
I have a question regarding the impleme
On Monday, 9 November 2015 at 04:52:37 UTC, rsw0x wrote:
On Monday, 9 November 2015 at 04:29:30 UTC, Rikki Cattermole
wrote:
On 09/11/15 4:57 PM, TheFlyingFiddle wrote:
[...]
Nope.
[...]
As far as I'm aware, you are stuck using e.g. structs to
emulate AA behavior.
I have a VERY basic imp
I have a few questions about the pseudo built in associative
arrays.
1. Is it possible to have the built in associative array use a
custom allocator from std.experimental.allocator to service it's
allocation needs?
2. A while ago I read on the newsgroup a while back that there
was a plan to
On Monday, 9 November 2015 at 02:14:58 UTC, Jon D wrote:
Here's an example of the behavior differences below. It uses
refRange, but same behavior occurs if the range is created as a
class rather than a struct.
--Jon
This is an artifact of struct based ranges being value types.
When you use t
On Friday, 6 November 2015 at 11:38:29 UTC, Marc Schütz wrote:
On Friday, 6 November 2015 at 11:37:22 UTC, Marc Schütz wrote:
Ok, benchA and benchB have the same assembler code generated.
However, I _can_ reproduce the slowdown albeit on average only
20%-40%, not a factor of 10.
Forgot to add
On Friday, 6 November 2015 at 03:59:07 UTC, Charles wrote:
Is it possible to have unittest blocks if I'm compiling a
library?
I've tried having this:
test.d:
class Classy {
unittest { assert(0, "failed test"); }
}
and then build it with `dmd test.d -lib -unittest` and it
do
On Friday, 6 November 2015 at 00:43:49 UTC, rsw0x wrote:
On Thursday, 5 November 2015 at 23:37:45 UTC, TheFlyingFiddle
wrote:
On Thursday, 5 November 2015 at 21:24:03 UTC, TheFlyingFiddle
wrote:
[...]
I reduced it further:
[...]
these run at the exact same speed for me and produce identica
On Thursday, 5 November 2015 at 21:24:03 UTC, TheFlyingFiddle
wrote:
On Thursday, 5 November 2015 at 21:22:18 UTC, TheFlyingFiddle
wrote:
On Thursday, 5 November 2015 at 11:14:50 UTC, Marc Schütz
wrote:
~10x slowdown...
I forgot to mention this but I am using DMD 2.069.0-rc2 for x86
windows.
On Thursday, 5 November 2015 at 21:22:18 UTC, TheFlyingFiddle
wrote:
On Thursday, 5 November 2015 at 11:14:50 UTC, Marc Schütz wrote:
~10x slowdown...
I forgot to mention this but I am using DMD 2.069.0-rc2 for x86
windows.
On Thursday, 5 November 2015 at 11:14:50 UTC, Marc Schütz wrote:
On Thursday, 5 November 2015 at 03:52:47 UTC, TheFlyingFiddle
wrote:
Can you publish two compilable and runnable versions of the
code that exhibit the difference? Then we can have a look at
the generated assembly. If there's reall
On Wednesday, 4 November 2015 at 01:14:31 UTC, Nicholas Wilson
wrote:
Note that there are two different alignments:
to control padding between instances on the stack
(arrays)
to control padding between members of a struct
align(64) //arrays
struct foo
{
align(16) short
On Tuesday, 3 November 2015 at 15:29:31 UTC, Namal wrote:
well I tried this that way, but my count stays 0, same as if I
do it in an int function with a return though I clearly have
some false elements in the arr.
You could also use count:
http://dlang.org/phobos/std_algorithm_searching.html#
On Tuesday, 3 November 2015 at 23:41:10 UTC, maik klein wrote:
Is it possible to filter variadics for example if I would call
void printSumIntFloats(Ts...)(Ts ts){...}
printSumIntFloats(1,1.0f,2,2.0f);
I want to print the sum of all integers and the sum of all
floats.
//Pseudo code
void pr
Is there a built in way to do this in dmd?
Basically I want to do this:
auto decode(T)(...)
{
while(...)
{
T t = T.init; //I want this aligned to 64 bytes.
}
}
Currently I am using:
align(64) struct Aligner(T)
{
T value;
}
auto decode(T)(...)
{
Aligner!T t = void;
whi
On Tuesday, 3 November 2015 at 01:55:27 UTC, Freddy wrote:
Is there any way I can Unionize range Types?
---
auto primeFactors(T)(T t, T div = 2)
{
if (t % div == 0)
{
return t.only.chain(primeFactors(t / div, div));
}
if (div > t)
{
return [];
}
else
On Tuesday, 3 November 2015 at 03:16:07 UTC, Andrew wrote:
I've written a short D program that involves many lookups into
a static array. When I make the array immutable the program
runs faster. This must mean that immutable is more than a
restriction on access, it must affect the compiler out
On Friday, 30 October 2015 at 21:29:22 UTC, BBasile wrote:
__gshared is mostly usefull on fields (eg public uint a)
because it prevents a data to be put on the TLS, which in
certain case reduces the perfs up to 30%. The byte code using a
global variable that's not __gshared can be incredibly sl
On Friday, 30 October 2015 at 20:58:37 UTC, anonymous wrote:
On 30.10.2015 21:23, TheFlyingFiddle wrote:
Is this intended to work?
struct A
{
__gshared static this()
{
//Add some reflection info to some global stuff.
addReflectionInfo!(typeof(this));
}
}
I just notice
On Friday, 30 October 2015 at 20:59:46 UTC, Adam D. Ruppe wrote:
On Friday, 30 October 2015 at 20:23:45 UTC, TheFlyingFiddle
wrote:
But yeah, the struct feature table http://dlang.org/struct.html
shows them as checked.
I gotta say the language documentation is shaping up nicely.
Is this intended to work?
struct A
{
__gshared static this()
{
//Add some reflection info to some global stuff.
addReflectionInfo!(typeof(this));
}
}
I just noticed this works in 2.069, is this intended? I mean I
love it! It makes it possible to do lot's of useful mixins fo
On Friday, 30 October 2015 at 11:46:43 UTC, TheFlyingFiddle wrote:
I want to be able to do something like this:
enum a = 32
enum b = { q,w,e,r,t,y }
CtType ctype = getCtType!(a); // -> Would become
CtType.enumConstant
CtType ctype1 = getCtType!(b); // -> Would become CtType.enum_
Never min
I want to be able to do something like this:
enum a = 32
enum b = { q,w,e,r,t,y }
CtType ctype = getCtType!(a); // -> Would become
CtType.enumConstant
CtType ctype1 = getCtType!(b); // -> Would become CtType.enum_
On Tuesday, 27 October 2015 at 21:28:31 UTC, Adam D. Ruppe wrote:
On Tuesday, 27 October 2015 at 21:23:45 UTC, TheFlyingFiddle
wrote:
I can account for the first thing a vtable. But that
should only cover 4bytes. What's in the other 4bytes?
The monitor used for `synchronized`.
(yes, this is s
With this code:
class A { }
pragma(msg, __traits(classInstanceSize, A));
I get the output 8 (32-bit).
I can account for the first thing a vtable. But that
should only cover 4bytes. What's in the other 4bytes?
On Saturday, 24 October 2015 at 19:00:57 UTC, TheFlyingFiddle
wrote:
One thing about variant is that if the struct you are trying to
insert is larger then (void delegate()).sizeof it will allocate
the wrapped type on the gc heap.
This is not a concern if you want to have class templates as the
On Saturday, 24 October 2015 at 18:40:02 UTC, TheFlyingFiddle
wrote:
To complete TemplateStruct simply forward the remaing members
of the
variant. Or use something like proxy!T in std.typecons. Or use
an alias this v.
(I don't really recommend alias this it has all kinds of
problems)
One thin
On Saturday, 24 October 2015 at 18:29:08 UTC, TheFlyingFiddle
wrote:
Variant[] array;
array ~= S!int(...);
array ~= S!double(...);
array ~= S!long(...);
array ~= "I am a string!";
And this is probably not what you want.
You can do this if you want to ensure that items stored in the
variant ar
On Saturday, 24 October 2015 at 15:57:09 UTC, Dandyvica wrote:
Hi guys,
Apart from deriving from the same class and declaring an array
of that
root class, is there a way to create an array of templates?
This seems not possible since template are compile-time
generated, but just to be sure. F
On Thursday, 22 October 2015 at 16:15:23 UTC, Shriramana Sharma
wrote:
I wanted a D equivalent to:
http://doc.qt.io/qt-5/qdatastream.html
https://docs.python.org/3/library/pickle.html
and saw that one is under construction:
http://wiki.dlang.org/Review/std.serialization
But till it's finali
On Monday, 12 October 2015 at 05:19:40 UTC, Andre wrote:
Hi,
writeln("foo "~ true ? "bar" : "baz");
André
"foo" ~ true
How does this compile? All i can see is a user trying to append a
boolean to a string which is obvously a type error. Or are they
converted to ints and then ~ would
On Friday, 24 April 2015 at 18:28:16 UTC, Guillaume wrote:
Hello, I'm trying to make a regex comparison with D, based off
of this article: https://swtch.com/~rsc/regexp/regexp1.html
I've written my code like so:
import std.stdio, std.regex;
void main(string argv[]) {
string m = argv[
On Wednesday, 25 February 2015 at 19:32:50 UTC, Namespace wrote:
How can I specify that 'func' is @nogc? Or can define the
function otherwise?
An alternative solution would be to use function
templated on an alias.
import std.traits;
void glCheck(alias func)(string file = __FILE__,
On Monday, 21 July 2014 at 01:42:58 UTC, Daniel Gibson wrote:
Am 21.07.2014 03:34, schrieb Vlad Levenfeld:
To get a foreach to run at compile-time, you have to give it
something
whose value is known to the compiler (so, T and
typeof(argTuple) would
suffice, and 0..T.length really should as wel
On Monday, 21 July 2014 at 15:04:14 UTC, TheFlyingFiddle wrote:
//Outputs 1 to 10 at compile-time.
Edit: 0 to 9
On Monday, 21 July 2014 at 15:04:14 UTC, TheFlyingFiddle wrote:
template staticIota(size_t s, size_t e, size_t step = 1)
{
import std.typetuple : TypeTuple;
static if(s < e)
alias staticIota = TypeTuple!(s, staticIota!(s + step, e,
step));
else
alias staticIota = TypeTuple!
On Tuesday, 17 June 2014 at 07:53:51 UTC, monarch_dodra wrote:
On Tuesday, 17 June 2014 at 04:32:20 UTC, Jakob Ovrum wrote:
On Monday, 16 June 2014 at 20:49:29 UTC, monarch_dodra wrote:
MyCompare cmp(SortOrder.ASC, 10);
This syntax is not valid D.
It should be:
auto cmp = MyCompare(SortO
On Friday, 13 June 2014 at 04:11:38 UTC, Rutger wrote:
I'm trying to create a minimal tweening library in D based on
the
commonly used easing equations by Robert Penner
(http://www.robertpenner.com/easing/).
One of the goals with the design of the library is that any
numeric type should be tween
On Wednesday, 28 May 2014 at 14:36:25 UTC, Chris wrote:
I use Appender to fill an array. The Appender is a class
variable and is not instantiated with each function call to
save instantiation. However, the return value or the function
must be dup'ed, like so:
Appender!(MyType[]) append;
publi
On Friday, 9 May 2014 at 23:12:44 UTC, Charles Hixson via
Digitalmars-d-learn wrote:
But I'm worried about the receiving end. It needs, somehow, to
ensure that the message it receives is the appropriate message,
and that other messages don't get dropped while it's waiting
for the answer...or
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