@property method needs ()
Hi,
in following example the @property method needs the ()
otherwise compiler error for row 24 is thrown.
I cannot judge, whether the compiler behaves correct or not.
Kind regards
André
---
alias fnError = void delegate(string s);
interface IfSession
{
@property fnError addError();
}
class Session: IfSession
{
private fnError _addError;
@property fnError addError()
{
return _addError;
}
}
void main()
{
auto session = new Session();
session._addError = delegate(s){};
session.addError()("test"); // Works
session.addError("test"); // Does not work
}
Re: How does this work?
On Sun, 23 Nov 2014 22:51:48 +
Freddy via Digitalmars-d-learn
wrote:
> I know what this does, but can someone explain how it works?
>
> static if((typeof((inout int=0){
>
> })));
>
it was here somewhere. this is, as you can see, a lambda. `typeof()`
can be used even for invalid code and will return special `error` type
(don't try to catch it, just trust me ;-). in `static if` this `error`
type means `false`. labmda that can not be compiled is obvious invalid,
uncompilable code, so it has a type of `error`.
and `inout` is a hack for some kind of functions/templates.
to make a long story short: don't try to remember it all, you'll forget
it next day. just take it as it is and be happy. ;-)
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Re: Casting in Safe D
On Sunday, 23 November 2014 at 19:37:45 UTC, Nordlöw wrote:
I just noticed that
void foo() @safe pure nothrow
{
void[] void_array = new void[3];
auto ubyte_array = cast(ubyte[])void_array;
auto short_array = cast(short[])void_array;
}
compiles but gives a
object.Error@(0): array cast misalignment
because of the
cast(short[])
I'm surprised---why is cast between different alignments and
element lengths allowed at all in Safe D?
As far as I understand, it's @safe because it's guaranteed to
fail at run time on mismatches.
Similarly, array accesses are @safe because invalid ones will
throw RangeError:
void foo(int[] a) @safe {a[100] = 13;}
And even pointer dereferencing is @safe. Invalid ones will fail
with a segfault at run time:
void foo(int* a) @safe {*a = 13;}
How does this work?
I know what this does, but can someone explain how it works?
static if((typeof((inout int=0){
})));
Casting in Safe D
I just noticed that
void foo() @safe pure nothrow
{
void[] void_array = new void[3];
auto ubyte_array = cast(ubyte[])void_array;
auto short_array = cast(short[])void_array;
}
compiles but gives a
object.Error@(0): array cast misalignment
because of the
cast(short[])
I'm surprised---why is cast between different alignments and
element lengths allowed at all in Safe D?
IMO, cast(ubyte[]), should be safe here though.
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Re: undefined reference to class template
On Friday, 14 November 2014 at 23:29:34 UTC, Satoshi wrote:
Hi, Im using GDC 4.9.0 compiler. I have template classes like
"public class LinkedList(T) {...}" and when I try compile it
together, everything works fine. But when I compile every
source file to separate object file and link it together with
ld Ill get errors like:
"/os/KernelLand/Kernel/TaskManager/Thread.d:99: undefined
reference to
`_D7Library10LinkedList45__T10LinkedListTC11TaskManager6Thread6ThreadZ10LinkedList6__ctorMFNaNbNfZC7Library10LinkedList45__T10LinkedListTC11TaskManager6Thread6ThreadZ10LinkedList'"
Im compiling it with command like:
gdc -mcmodel=kernel -nostdlib -mno-red-zone -Wall -masm=intel
-frelease -finline-functions -O3 -o obj-x86_64/abc.d.o -c abc.d
Here is
full error log http://pastebin.com/SjnYjqKh
makefile
https://github.com/Bloodmanovski/Trinix/blob/dc80f3197f59fe96e9f4e29cea670ff2c7eaa342/KernelLand/Kernel/Makefile#L104
LinkedList class
https://github.com/Bloodmanovski/Trinix/blob/dc80f3197f59fe96e9f4e29cea670ff2c7eaa342/KernelLand/Kernel/Library/LinkedList.d
Can anyone help me how to solve this problem? Thanks
(Sorry for bad english)
Sounds like you're not passing in LinkedList.d while compiling a
file that uses it. You need to include all used files, including
imports, on the command line when compiling. The undefined
reference indicates it can't find the source code or di file
containing LinkedList. Tools like rdmd do this for you by looking
at the imports used automatically.
If not that, I'm not sure if this will help, but try using
-femit-templates (similar to -allinst in DMD I believe?).
Besides that, all I can really suggest is double checking that
you're actually including the object file containing LinkedList
when you're linking and the source file when compiling.
