On Sunday, 9 June 2024 at 23:31:47 UTC, drug007 wrote:
```d
const seed = cast(uint) Clock.currStdTime;
```
Casting like this looks nice. It fits my type of thinking.
On Sunday, 9 June 2024 at 13:20:09 UTC, Joseph Rushton Wakeling
wrote:
On Saturday, 8 June 2024 at 16:09:04 UTC, monkyyy wrote:
rng is an optional parameter, `uniform(0,100).writeln;` alone
works; the docs not telling you that is really bad
The docs do tell you that `rng` is an optional parame
On Saturday, 8 June 2024 at 18:25:20 UTC, drug007 wrote:
~~~
{
const seed = castFrom!long.to!uint(Clock.currStdTime);
auto rng = Random(seed);
auto result = generate!(() => uniform(0, 10,
rng))().take(7);
// new random numbers sequence every time
res
On Saturday, 8 June 2024 at 21:04:16 UTC, monkyyy wrote:
generate is a very rare function and do novices understand
lamdas?
Yes I know lamdas, but try not to use them.
I am not very picky about the exact source of time, I just want a
different integer every time I run the program. But while l
I managed to create a random number generator using the following
code:
~~~
auto rng = Random(42);
//
uniform(0,10,rng);
~~~
Now I want to seed the generator using system time. I looked at
Date & time functions/classes and systime functions/classes. The
problem is that they all require a
On Wednesday, 5 June 2024 at 10:36:50 UTC, Nick Treleaven wrote:
```d
import std.stdio;
alias s_cell = int;
void main()
{ writeln("Maze generation demo");
s_cell [5][5] maze;
int n;
foreach (i, row; maze)
foreach (j, col; row)
maze[i][j] = n++;
s_cell[][5] slic
On Tuesday, 4 June 2024 at 16:19:39 UTC, Andy Valencia wrote:
On Tuesday, 4 June 2024 at 12:22:23 UTC, Eric P626 wrote:
I tried to find a solution on the internet, but could not find
anything, I stumble a lot on threads about Go or Rust language
even if I specify "d language" in
I am currently trying to learn how to program in D. I thought
that I could start by trying some maze generation algorithms. I
have a maze stored as 2D array of structure defined as follow
which keep tracks of wall positions:
~~~
struct s_cell
{
bool north = true;
bool east = true;
boo
Any D function marked as extern(C) can be called from C. As
long as you have a C header file defining the functions and the
appropriate C declarations any custom types you have, the C
code will have no idea it's calling into a D library.
Thanks for the example. It clarify things up. The drunti
This is a false dilemma: D has full C compatibility.
From what I understand, D can use C, but C cannot use D? It's
like C++: C++ can call C but C cannot call C++.
50% or more of my code will be put in re-usabled libraries. If I
want people to use those libs, I would need to compile them in C
The title of this thread might be weird, but I am currently
reconsidering the language and tools I am using before returning
to production again.
# Objective and projects
Make simple turn based (no animation) video games using Allegro
4, maybe 5, and eventually SDL on multiple platforms: Linu
Shouldn't (stream == null) be (stream is null)?
-Eric
From: "adamgoldberg via Digitalmars-d-learn"
To: digitalmars-d-learn@puremagic.com
Sent: Monday, July 22, 2019 3:05:17 PM
Subject: Why does a switch break cause a segmentation fault
Hey, I just happened to be writing
On Tuesday, 14 August 2018 at 03:01:11 UTC, Cecil Ward wrote:
On Tuesday, 14 August 2018 at 02:53:01 UTC, Cecil Ward wrote:
On Sunday, 12 August 2018 at 12:27:59 UTC, Alex wrote:
On Saturday, 11 August 2018 at 05:17:51 UTC, Cecil Ward wrote:
T myfunc(T)( T x, uint mask )
if ( mask == 3 )
I thought it would work the same way as an interface (which must
be implemented by the direct sub class, otherwise compile error).
But apparently it's possible to implement an abstract function
anywhere in the class hierarchy. That makes it, in this case,
impossible to check during compile time.
Code below compiles while I would not expect it to compile.
Is there a reason that this compiles?
Specs are a bit lite on abstract classes.
Only thing I found that would need to allow this is: "19.4
functions without bodies"
https://dlang.org/spec/function.html#function-declarations
But that's
Not a question.
I came up with a nice and simple way to apply operations on an
arbitrary number of members of unknown type of a set of objects
of unknown type. This without having to reimplement these
operations for each class that needs to support the operation(s).
All this without explicitl
On Wednesday, 18 July 2018 at 12:10:18 UTC, baz wrote:
Specs are clear : it's a global so it's evaluated at compile
time
(https://dlang.org/spec/declaration.html#global_static_init)
Example code should not compile.
Indeed. Inside a function it does actually work.
And ofcourse for
class Tes
On Monday, 16 July 2018 at 22:16:10 UTC, Adam D. Ruppe wrote:
On Monday, 16 July 2018 at 22:08:34 UTC, Eric wrote:
This makes the compiler crash. Is it illegal code?
Yes, a struct can be moved at any time by the compiler which
means pointers to it can be invalidated at random.
Unless you
Pasted slightly wrong code, last line should be:
List ls = 2;
Question still stands.
This makes the compiler crash. Is it illegal code?
struct List {
private List* head;
private List* tail;
this(int x) {
head = null;
tail = &this; // <-- crasher
}
}
List2 ls = 2;
I am just a bit confused why I had to use tuple() while the doc
Because of the enum, that code was full of errors :/
Got it now:
auto groupIndex(Ts...)() {
import std.meta;
import std.algorithm.comparison : cmp, strcmp = cmp;
enum Comp(N1, N2) = strcmp(N1.stringof, N2.s
Ok, solved. It appears you can sort tuples.
I am just a bit confused why I had to use tuple() while the doc
for staticSort states it works on AliasSeq.
auto groupIndex(Ts...)() {
import std.meta;
enum Comp(alias N1, alias N2) = { __traits(identifier,
typeof(N1)) < __traits(identifier
Forgot to mention that I also want groupIndex!(A,B) ==
groupIndex!(B,A)
Which I wanted to do by sorting the names.
If that requirement wasn't there it would be as simple as:
auto groupIndex(Ts...)() {
return GroupId!Ts.id;
}
size_t s_nextIdx=1;
struct GroupId(Ts ...) {
static size_t id;
I am trying to build a string->int dictionary at compile time.
The ints are unique and must not be greater than the number of
unique strings.
So, they are sequential for each string that is not yet indexed.
Example:
size_t idx1 = nameToIndex!"blah"; // 0
size_t idx2 = nameToIndex!"blah2"; //
In the above code, the function with the simple enum type
argument can
be overloaded, but the function with the complex enum type
argument cannot be overloaded.
Is this a bug?
Thx.
Eric
On Sunday, 2 April 2017 at 04:14:56 UTC, rikki cattermole wrote:
On 02/04/2017 2:37 AM, Eric wrote:
I'm planning on some day putting a package in the DUB
registry. My package
is dependent on my "util" package which is a collection of
stuff I use
across
all my projects. D
I'm planning on some day putting a package in the DUB registry.
My package
is dependent on my "util" package which is a collection of stuff
I use across
all my projects. Does this mean I also have to put my util
package in the DUB registry?
Could I just make "util" a git sub module of the pa
On Saturday, 11 March 2017 at 17:54:55 UTC, ag0aep6g wrote:
On 03/11/2017 06:41 PM, Eric wrote:
I'm trying to build the master branch of DMD on redhat 7.
I get the following errors:
ddmd/root/newdelete.c:26:8: error: expected identifier or ‘(’
before
string constant
exte
On Saturday, 11 March 2017 at 17:54:55 UTC, ag0aep6g wrote:
Looks like a C compiler is used instead of a C++ compiler.
Despite the extension, dmd's *.c files are C++ code.
Yes, that's what I thought - redhat has gcc, but not g++. There
must
be a needed compile option...
I'm trying to build the master branch of DMD on redhat 7.
I get the following errors:
ddmd/root/newdelete.c:26:8: error: expected identifier or ‘(’
before string constant
extern "C"
^
ddmd/root/newdelete.c:31:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’
or ‘__attribute__’ before ‘new’
v
Yes, it's a bug. Please file an issue.
Meanwhile try this workaround:
class A(T)
{
static assert(is(T : A!T), "...");
}
Bug report filed, and thanks for the workaround.
-Eric
declaration A(T) if (is(T : A!T))
//while looking for match for A!(B)
class B : A!(B)
{
}
void main(string[] args)
{
B b = new B();
A!B a = b; // compiles fine
}
-Eric
On Friday, 15 April 2016 at 18:28:58 UTC, Eric wrote:
line 6 can be fixed like this: "const I!(J) i = a;"
Now if I can just figure out how to fix line 15...
This works:
1 alias J = const C;
2
3 void main(string[] args)
4 {
5 J a = new C();
6 const (I!(J)) i = a;
On Friday, 15 April 2016 at 18:22:02 UTC, Eric wrote:
On Friday, 15 April 2016 at 17:43:59 UTC, ag0aep6g wrote:
On 15.04.2016 19:13, Eric wrote:
1 alias J = const C;
2
3 void main(string[] args)
4 {
5 J a = new C();
6 I!(J) i = a;
7 }
8
9 interface I(V
On Friday, 15 April 2016 at 17:43:59 UTC, ag0aep6g wrote:
On 15.04.2016 19:13, Eric wrote:
1 alias J = const C;
2
3 void main(string[] args)
4 {
5 J a = new C();
6 I!(J) i = a;
7 }
8
9 interface I(V) { }
10
11 class F(V) if (is(V : I!(V))) { }
12
13
nverted to I!(V) then this template can be used". However,
line 6 does not give
an error, and it seems to be automaticaly converting J to I!(J).
-Eric
On Monday, 11 April 2016 at 00:55:44 UTC, Mike Parker wrote:
On Sunday, 10 April 2016 at 17:19:14 UTC, Eric wrote:
I am getting this error when I compile:
Error: Internal Compiler Error: unsupported type const(string)
No line number is given. Does anyone know what causes this?
compiler
I am getting this error when I compile:
Error: Internal Compiler Error: unsupported type const(string)
No line number is given. Does anyone know what causes this?
compiler version = v2.071.0
-Eric
BTW, why do you need FreeImage to create image? Isn't it just
possible inside dlangui?
This is basically my question. Is there a drawing engine that
can draw lines, circles, and shapes as well as single pixels?
-Eric
On Tuesday, 25 November 2014 at 02:48:43 UTC, Jonathan M Davis
via Digitalmars-d-learn wrote:
On Monday, November 24, 2014 22:12:08 Eric via
Digitalmars-d-learn wrote:
@safe
class Y { }
@safe
class X { }
@safe
class Z
{
int x;
this()
{
if (typeid(X) == typeid(Y)) x
object.opEquals'
Isn't this analagous to saying that the "instanceof" operator
in java endangers the GC?
Is it correct to replace '==' with 'is'?
-Eric
; }
}
void main()
{
immutable(Y) y = new immutable Y(4);
X!(immutable(Y)) x = new X!(immutable(Y))(y);
}
Thanks for your help.
-Eric
On Saturday, 22 November 2014 at 17:06:29 UTC, anonymous wrote:
On Saturday, 22 November 2014 at 15:00:00 UTC, Eric wrote:
Yes, but if I don't declare the class T as immutable, I don't
think this constraint will work.
You're mistaken. It works just fine.
class X /
at has a limit. Try this:
import std.stdio;
enum A = 65536;
enum B = 32;
alias MyType = int[A][B];
void foo(ref MyType arr)
{
writeln(arr[3][3]);
}
MyType arr;
void main()
{
writeln("arr[3][3] = ", arr[3][3]);
foo(arr);
}
-Eric
On Saturday, 22 November 2014 at 15:57:40 UTC, ketmar via
Digitalmars-d-learn wrote:
On Sat, 22 Nov 2014 15:45:51 +
Eric via Digitalmars-d-learn
wrote:
Maybe this is not so lame because change() can take
any length of static array.
void change (int[] arr) {
arr[1] = 42
2, 3];
writeln("a = ", a);
change(a.ptr);
writeln("a = ", a);
}
Maybe this is not so lame because change() can take
any length of static array.
-Eric
writeln("a = ", a);
}
-Eric
On Saturday, 22 November 2014 at 09:57:55 UTC, anonymous wrote:
On Saturday, 22 November 2014 at 02:37:21 UTC, Eric wrote:
I know I can make a class immutable, but the problem is I want
to constrain a template parameter to only immutable types,
and I want to use class types.
template Foo(T
.
I know I can make a class immutable, but the problem is I want
to constrain a template parameter to only immutable types,
and I want to use class types.
-Eric
e X(5);
immutable X x2 = new immutable X(5);
I would like for x1.toHash() to equal x2.toHash(),
but this is not the case because toHash() cannot be overridden.
Note also that (x1 != x2) even though they should be equal (I
think...)
Is this a bug or a feature?
-Eric
On Friday, 21 November 2014 at 22:52:54 UTC, H. S. Teoh via
Digitalmars-d-learn wrote:
On Fri, Nov 21, 2014 at 10:30:51PM +, Eric via
Digitalmars-d-learn wrote:
On Friday, 21 November 2014 at 22:25:32 UTC, anonymous wrote:
>On Friday, 21 November 2014 at 22:15:37 UTC, Eric wr
On Friday, 21 November 2014 at 22:25:32 UTC, anonymous wrote:
On Friday, 21 November 2014 at 22:15:37 UTC, Eric wrote:
Suppose I have:
module test;
class X { }
class Y : X { }
Y y = new Y;
X x = y;
assert(is(typeof(x) == test.Y); // this assertion will fail
assert(typeid(x).toString
comparison?
-Eric
Thanks!
-Eric
On Saturday, 15 November 2014 at 18:49:32 UTC, anonymous wrote:
On Saturday, 15 November 2014 at 18:30:00 UTC, Eric wrote:
Hi -
I've never designed a recursive template before, but I think
that would solve my problem. What I would like is
someting like this:
class X
ld be:
SomeType!(int, SomeType!(string, SomeType!(double, V))) var;
// or put another way:
SomeType!(K[0], SomeType!(K[1], SomeType(K[2], V))) var;
}
Can anyone give me some ideas on how to set up the declaration?
Thanks,
Eric
othered to do it before. But I was just reading
Adam's
book the other day, and I remember seeing this:
objdump -d -M intel simpleOctal
Not sure what the switches are for; the name of the program is
simpleOctal.
But the name of the utility is objdump. (on Linux). Not sure
about Windoze.
-Eric
On Thursday, 31 July 2014 at 19:43:00 UTC, bearophile wrote:
Eric:
Suppose I have some memory allocated on the heap, and I have
two pointers pointing to the beginning and end of a contiguous
segment
of that memory. Is there a way I can convert those two
pointers
to an array slice without
Suppose I have some memory allocated on the heap, and I have
two pointers pointing to the beginning and end of a contiguous
segment
of that memory. Is there a way I can convert those two pointers
to an array slice without actually copying anything within the
segment?
Thx,
Eric
On Tuesday, 22 July 2014 at 17:09:29 UTC, bearophile wrote:
Eric:
while (!buf.empty())
{
p++;
buf.popFront();
Those () can be omitted, if you mind the noise (but you can
also keep them).
if (buf.front() <= '0' || buf.front() >= '9')
By the way, do you really mean to stop on '0' and '9'? Do you
perhaps mean "a < '0' || a > '9'"?
Yes, my bad...
curTok.image = to!string(s);
}
The problem is that "until" seems to not stop at the end of the
number,
and instead continues until the end of the buffer. Am I doing
something
wrong here? Also, what is the fastest way to convert a range to
a string?
Thanks,
Eric
t getValue() { return(value); }
When you could just have a public field:
int value;
That lets you set and get the value without the parens anyways?
thanks,
Eric
There are a lot of discussions in the forums about how @property
should or could be implemented. But I can't seem to find anything
that explains why or when I should use @property with the current
compiler. Can anyone explain why and when I should use the
@property tag?
Thx.
Eric
ive D" and "D CTFE"
-Eric
tever
type the enum happens to implement. In java, all enums are
of enum type. So it's probably me that's confused.
-Eric
On Thursday, 3 April 2014 at 22:34:19 UTC, bearophile wrote:
Eric:
I disagree. If you just think of a class type enum as a class
type,
then what you say makes sense. But if you instead think of it
as a more powerful enum then it can enhance data safety in a
program.
I was speaking about
they
are designed mostly for integral built-in types, including
chars, etc.
I disagree. If you just think of a class type enum as a class
type,
then what you say makes sense. But if you instead think of it as
a more powerful enum then it can enhance data safety in a program.
-Eric
nsistent. Would it make
sense to have like an "uint opOrdinal()" method that would return
a value known at compile time so that class or struct enums
can be used in switch statements?
Thanks,
Eric
Awesome... it works!-Eric
Original Message
Subject: Re: enum question
From: Ali Çehreli <acehr...@yahoo.com>
Date: Tue, March 18, 2014 3:51 pm
To: digitalmars-d-learn@puremagic.com
On 03/18/2014 01:40 PM, Eric wrote:
> Apparently you can't pass an enum as a ref
On Tuesday, 18 March 2014 at 20:56:45 UTC, Adam D. Ruppe wrote:
On Tuesday, 18 March 2014 at 20:40:36 UTC, Eric wrote:
However, using struct type seems inefficient because structs
are pass by value.
That's not necessarily a problem, especially if the struct is
small, passing by val
have read
on this forum that someday enums may be able to be made with
class elements.
Can enums be made of classes yet, or is there a way to make the
enum based
on structs more efficient?
Thanks,
Eric
4 at 05:20:25 UTC, Eric Suen wrote:
>> Generic?
>>
>
> I don't see how this would help. I'd have to specify every
> concrete type in the creation of the object which might be
> significant. I can't use a generic virtual method so that doesn't
> help eit
Generic?
"Frustrated" ...
> interface iGui
> {
> @property iButton button(ref iButton button);
> }
>
> class WindowsGui : iGui
> {
> WindowsButton _button;
>
> @property WindowsButton button(ref WindowsButton button)
> //@property iButton button(ref iButton button)
> {
> _button = button;
> retur
Apparently the line,
static shared static int x;
will compile just fine. Is this sort of a bug,
or does it mean something different from just
static shared int x;
?
Also, the line,
static static static int x;
will also compile. Does this mean x is extra static?
-Eric
I should have also added that the overloaded ! method returns a
class instance and not a bool.
-Eric
On Wednesday, 26 June 2013 at 04:16:30 UTC, Ali Çehreli wrote:
On 06/25/2013 09:05 PM, Jonathan M Davis wrote:
> On Wednesday, June 26, 2013 05:35:03 cal wrote:
>> On Wednesday, 26 June 2013 at 02:50:51 UTC, Eric wrote:
>>> Is there a way to overload the ! operator? I can&#x
Is there a way to overload the ! operator? I can't seem to get
it to work with the standard unaryOp method. I need this because
I am making a wrapper for a C++ API that has ! overloaded.
-Eric
On Tuesday, 11 June 2013 at 16:09:39 UTC, Steven Schveighoffer
wrote:
On Tue, 11 Jun 2013 10:04:21 -0400, Eric
wrote:
The following code does not compile:
class Foo { int x; }
class Bar { static Foo f = new Foo(); } // compiler error
static Foo g = new Foo(); // compiler error
These can
ances is a compiler bug?
-Eric
ass thread local variable are allowed, not T.Foo
T.d(5): Error: variable T.g is mutable. Only const or immutable
class thread local variable are allowed, not T.Foo
Why aren't static class instances allowed? Is there a
work-around,
or alternative approach to this?
Thanks,
Eric
On Saturday, 8 June 2013 at 02:32:57 UTC, bearophile wrote:
Eric:
Yes, the template constraint is much better. However, the
compiler still crashes, even with the new code:
Because there's a type definition loop, regardless. Using a
constraint doesn't change that situat
ass Foo(K): Identity!(Foo!K, K) {
K k;
}
void main() {
new Foo!double;
}
(dmd7) mrbig:~/tp/d_test2/dlib>dmd Test.d
Segmentation fault (core dumped)
In D return is not a function, so don't use the ( ).
Yeah, I know. return returns an expression, and parenthesis
are legal expression syntax:)
-Eric
using compiler version v2.063-devel-53aa503.
Is this a known problem, or is there a work-around?
Thanks,
Eric
On Friday, 7 June 2013 at 18:06:26 UTC, anonymous wrote:
On Friday, 7 June 2013 at 17:52:48 UTC, Eric wrote:
interface Identity(V, K)
{
}
class X(V, K) : Identity!(V, K)
{
private K k;
public this(K k) { this.k = k; }
}
void main()
{
auto x = new X!(X, double)(6.0);
}
Hi -
I have
, double) does not match template
declaration X(V, K)
If I change the template parameter X to something else, like
string, it compiles fine. But I want the Identity interface to
know the type of the implementing class. Is that possible?
Thanks,
Eric
On Monday, 3 June 2013 at 17:20:22 UTC, Jacob Carlborg wrote:
On 2013-06-03 17:42, Eric wrote:
Thanks. That fixed my problem. This is my first D program,
so I wouldn't have figured it out on my own...
If it's not obvious, you should terminate the runtime as well
when your pr
first D program,
so I wouldn't have figured it out on my own...
-Eric
If I use "new" inside a D method that is called from a c++ program
it causes a segmentation fault. For example:
C++ code:
#include "dcode.h"
int main(int argc, char *argv[]) {
hello();
return(0);
}
D code:
class X {
private int x;
this() { x = 5; }
public int getX() { ret
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