Is -1 > 7 ?
forgive me if i'm doing something stupid, i'm extremely tired and
trying to avoid drinking coffee.
void main()
{
int[] arr = [0, 1, 2, 3, 4, 5, 6];
//check 1
if (-1 > arr.length)
writefln("WTF -> %d is greater than %d ", -1, arr.length);
else
writefln("GOOD -> %d is NOT greater than %d", -1, arr.length);
}
here is my output:
WTF -> -1 is greater than 7
Re: Is -1 > 7 ?
On Friday, 9 August 2013 at 15:18:47 UTC, Dicebot wrote:
On Friday, 9 August 2013 at 15:11:42 UTC, michaelc37 wrote:
forgive me if i'm doing something stupid, i'm extremely tired
and trying to avoid drinking coffee.
void main()
{
int[] arr = [0, 1, 2, 3, 4, 5, 6];
//check 1
if (-1 > arr.length)
writefln("WTF -> %d is greater than %d ", -1,
arr.length);
else
writefln("GOOD -> %d is NOT greater than %d", -1,
arr.length);
}
here is my output:
WTF -> -1 is greater than 7
And signed vs unsigned design issues pops up again! :)
*summoning bearophile*
On topic: arr.length has type size_t which is unsigned integer.
-1 gets silently casted to unsigned, resulting in size_t.max
value (0xFFF..) - which is obviously bigger than actual length.
I believe it should be a compile-time error but, unfortunately,
this is unlikely to happen.
Ahhh thanks for the explaination. if this was a compile time
error, i would have saved precious time; I found strange behavior
while writing some other related code, and I kept overlooking the
condition thinking "it cant be that".
Re: Is -1 > 7 ?
http://d.puremagic.com/issues/show_bug.cgi?id=259 https://github.com/D-Programming-Language/dmd/pull/1913 Looks like there has a pending fix for 4 months.
Auto-Implemented properties
i was trying to make a D template to mimic auto-implemented
properties in c#.
I think i got it to work but when i tried to give the template a
more meaning full name like AutoImplementedProperty i get a
compile error "a.title is not an lvalue".
Is this a bug?
Is there a more suitable way of doing this?
c# e.g:
class Bar
{
public string Title { get; set; }
}
my attempt:
class Bar
{
alias autoproperty!(string, "get", "set") title
}
template autoproperty(T, args...)
{
import std.typetuple;
@property
{
private T _name;
static if (args.length)
{
static if (staticIndexOf!("get", args) > -1)
{
public T autoproperty()
{
return _name;
}
}
static if (staticIndexOf!("set", args) > -1)
{
public void autoproperty(T value)
{
_name = value;
}
}
}
}
}
void main(string[] args)
{
Bar a = new Bar();
a.title = "asf";
writefln(a.title);
return;
}
Re: Auto-Implemented properties
On Saturday, 5 January 2013 at 22:53:44 UTC, Philippe Sigaud wrote: Hi Michael, your code works for me (DMD 2.061, Linux), with a semicolon after the alias in class Bar. Also, use writeln, not writefln, because writefln assumes the first parameter is the formatting string. Thanks for the tip. Does it work for you if you rename the template to "AutoImplementedProperty"?
Re: Auto-Implemented properties
On Saturday, 5 January 2013 at 23:00:48 UTC, monarch_dodra wrote: On Saturday, 5 January 2013 at 22:53:44 UTC, Philippe Sigaud wrote: Hi Michael, your code works for me (DMD 2.061, Linux), with a semicolon after the alias in class Bar. Also, use writeln, not writefln, because writefln assumes the first parameter is the formatting string. Why would you want get/set though when D offers property functions? The argument of "if your public attribute becomes private, then code breaks" is invalid in D. I'm not sure if i ever would use the template, but anyway I was having a cs vs d argument with a friend, and we ended up writing code samples for comparison. This is just one of the items that came up.
Re: Auto-Implemented properties
On Sunday, 6 January 2013 at 11:32:40 UTC, Jacob Carlborg wrote:
On 2013-01-05 23:40, michaelc37 wrote:
i was trying to make a D template to mimic auto-implemented
properties in c#.
I think i got it to work but when i tried to give the template
a
more meaning full name like AutoImplementedProperty i get a
compile error "a.title is not an lvalue".
Is this a bug?
Is there a more suitable way of doing this?
c# e.g:
class Bar
{
public string Title { get; set; }
}
my attempt:
class Bar
{
alias autoproperty!(string, "get", "set") title
}
template autoproperty(T, args...)
{
import std.typetuple;
@property
{
private T _name;
static if (args.length)
{
static if (staticIndexOf!("get", args) > -1)
{
public T autoproperty()
{
return _name;
}
}
static if (staticIndexOf!("set", args) > -1)
{
public void autoproperty(T value)
{
_name = value;
}
}
}
}
}
void main(string[] args)
{
Bar a = new Bar();
a.title = "asf";
writefln(a.title);
return;
}
This won't work like you think it will. All instances of "Bar"
will share the same "_name" variable.
You need to use a mixin. This pass:
void main ()
{
Bar a = new Bar();
a.title = "asf";
Bar b = new Bar;
assert(b.title == a.title);
}
Yea i realized that later, but the only fix i could come up with
required me passing the property name in the template parameters,
so the declaration has changed a bit.
second attempt;
class Bar
{
public mixin autoproperty!(string, "title", "get", "set");
public mixin autoproperty!(string, "description", "get", "set");
}
mixin template autoproperty(T, alias propertyName, args...)
{
import std.typetuple;
mixin("private T _" ~ propertyName ~ ";");
@property
{
static if (args.length)
{
static if (staticIndexOf!("get", args) > -1)
{
mixin("
T " ~ propertyName ~ "()
{
return _" ~ propertyName ~ ";
}");
}
static if (staticIndexOf!("set", args) > -1)
{
mixin("
void " ~ propertyName ~ "(T value)
{
_" ~ propertyName ~ " = value;
}");
}
}
}
}
Re: monodevelop mono-d versions
On Friday, 1 August 2014 at 09:12:49 UTC, sclytrack wrote: I'm on Ubuntu 14.04 LTS and it has version 4.0.12 of MonoDevelop. Has anybody else got this to work with this version? I have had no problems using this ppa ppa:ermshiperete/monodevelop it has packages for versions 4 and 5: monodevelop-4.0 monodevelop-5
Re: Invoking MAGO debugger
On Thursday, 26 February 2015 at 10:20:31 UTC, Vadim Lopatin wrote: Hello! I'm trying to integrate MAGO into DlangIDE. I can easy create instance of MAGO DebugEngine, but having problems with obtaining of IDebugPort which is needed for invoking of LaunchSuspended. It looks like to get IDebugPort, I need IDebugCoreServer2 instance. Does anybody know how to do it? Normally, it's being created by VisualStudio AFAIK. Best regards, Vadim I once remember pulling out my hair trying todo the same in order to get it to work with a monodevelop win32 debugger addon. It resulted in a writing new clr wrapper with a different exposed interface https://github.com/aBothe/MagoWrapper e.g. of how the debugee was was launched here: https://github.com/aBothe/MagoWrapper/blob/master/DebugEngine/MagoWrapper/NativeDebugger.cpp
Re: Debugging D in MonoDevelop, finding multiple gdb processes?
i am assuming you are using the built in gdb debugger.
a) you can try using this addin Gdb.D instead
-https://github.com/llucenic/MonoDevelop.Debugger.Gdb.D
it might be also be in the monodevelop beta repos.
b) you can "fix"/work around the issue by replacing
"Syscall.kill" in the source
(https://github.com/mono/monodevelop/blob/master/main/src/addins/MonoDevelop.Debugger.Gdb/GdbSession.cs)
with "proc.Kill()"
similarly as what was done in the Gdb.D source
(https://github.com/llucenic/MonoDevelop.Debugger.Gdb.D/blob/master/Gdb/GdbSession.cs)
then recompile and use.
On Wednesday, 10 June 2015 at 20:46:11 UTC, Rodger Beats wrote:
I'm new to the language and new to using MonoDevelop and I've
got this persistent problem that I haven't been able to solve
with Google searching. I frequently test out my code as I write
it and every time I start it up a new gdb process will start
running but not terminate at the end of the program. Even a
nothing program like the following will start up a new gdb
process that won't terminate:
int main( string[] args ){
return 0;
}
After testing out an application a few times I have to open my
process manager and clear out one gdb for every time I ran the
program. I'm using Linux Mint 17 x64.
Does anyone know how I can configure gdb to exit when a program
has exited successfully?
Re: Load Qt UI XML File as GUI
On Wednesday, 16 September 2015 at 04:03:46 UTC, Mike McKee wrote: Unfortunately, the http://dsource.org/forums/ doesn't appear to be active -- I can't login after I registered. This is where the QtD project has their forum. So, I'm asking this here. Is it possible with D and QtD to draw my GUI using QtCreator, and then take its UI XML file and load it somehow via QtD and D? That way, I don't need to do everything by hand and can utilize the power of a WYSIWYG form tool (like Glade), and then just manipulate the rest by code after that? As an alternative, you could try qml bindings from https://github.com/filcuc/dqml
