Re: Is there such concept of a list in D?
On Monday, 19 December 2022 at 22:22:11 UTC, thebluepandabear wrote: No worries, hopefully a mod will explain why. I don't like when posts get removed for no reason :| I received a report of a possible troll in the forums. Looking at the posts collectively, I agreed, so deleted all of them. Whenever we delete a post, we delete subsequent posts that quote them as well. Please take any further discussion on moderation policies to a new thread in the General forum and let's take this thread back on topic. Thanks!
Re: Preventing nested struct destructor accessing stack frame
On 16.12.22 14:07, Nick Treleaven wrote:
This seems to work:
~this() @trusted { if ( > cast(void*)1024) i++; }
It would be better if there was a struct property to get the context
pointer though.
A quick test suggests that the context pointer is the last item in
`tupleof`. So this might do the trick:
~this() { if (this.tupleof[$ - 1] !is null) i++; }
I don't know if it's guaranteed to work though. Might be an
implementation detail.
Re: Is there such concept of a list in D?
On Monday, 19 December 2022 at 22:22:11 UTC, thebluepandabear wrote: No worries, hopefully a mod will explain why. I don't like when posts get removed for no reason :| AI surround us in forum. People want to video chat now. In the time we live in, you can't be sure what to trust! SDB@79
Re: Is there such concept of a list in D?
No worries, hopefully a mod will explain why. I don't like when posts get removed for no reason :|
Re: Is there such concept of a list in D?
On 12/19/22 14:14, thebluepandabear wrote: > Yeah I am sure it was on this thread. One of the posts was at > https://forum.dlang.org/post/kzvnajixjdnlcupsl...@forum.dlang.org, it > now shows 'Not Found'. Then I don't know. (?) However, I realize my ThunderBird "evidence" is useless because if the disapparance happened before my ThunderBird connected since its last time, it wouldn't have a copy of the posts. (My ThunderBird does not connect automatically especially when the laptop lid is closed. :) ) Ali
Re: Is there such concept of a list in D?
On Monday, 19 December 2022 at 22:07:15 UTC, Ali Çehreli wrote: On 12/19/22 13:45, thebluepandabear wrote: > On Monday, 19 December 2022 at 21:41:45 UTC, thebluepandabear wrote: >> Why did my replies here to someone else get deleted? > > Myself and this other person's reply to this thread randomly got removed > for no reason, I would appreciate an explanation Are you sure it was this thread? What were in those posts? Perhaps they were posted on another thread? I follow these newsgroups with ThunderBird, which naturally keeps local copies of the posts. I've just gone through all posts in this thread and I see no difference between ThunderBird's cache and the forum interface's cache. Note that ThunderBird does not delete any post even if a moderator removes a posting from the newsgroup. For example, when a spam gets posted, my ThunderBird will show the post even after it's been deleted from the newsgroup server. Ali Yeah I am sure it was on this thread. One of the posts was at https://forum.dlang.org/post/kzvnajixjdnlcupsl...@forum.dlang.org, it now shows 'Not Found'. I just replied to this person who was asking whether or not I was talking about C's `union` type (I was not), and his post and my reply seems to have magically disappeared.
Re: _Symbols _with _leading _underscores
Much appreciated...
Re: Is there such concept of a list in D?
On 12/19/22 13:45, thebluepandabear wrote: > On Monday, 19 December 2022 at 21:41:45 UTC, thebluepandabear wrote: >> Why did my replies here to someone else get deleted? > > Myself and this other person's reply to this thread randomly got removed > for no reason, I would appreciate an explanation Are you sure it was this thread? What were in those posts? Perhaps they were posted on another thread? I follow these newsgroups with ThunderBird, which naturally keeps local copies of the posts. I've just gone through all posts in this thread and I see no difference between ThunderBird's cache and the forum interface's cache. Note that ThunderBird does not delete any post even if a moderator removes a posting from the newsgroup. For example, when a spam gets posted, my ThunderBird will show the post even after it's been deleted from the newsgroup server. Ali
Re: Is there such concept of a list in D?
On Monday, 19 December 2022 at 21:41:45 UTC, thebluepandabear wrote: Why did my replies here to someone else get deleted? Myself and this other person's reply to this thread randomly got removed for no reason, I would appreciate an explanation
Re: Is there such concept of a list in D?
Why did my replies here to someone else get deleted?
Re: No need opUnary
On 12/18/22 08:21, Salih Dincer wrote:
> Don't you think it's interesting that it doesn't need unary operator
> overloading?
Yes, it is interesting. I put comments to explain it to myself:
import std.stdio;
struct S
{
int value;
/* The folowing declaration allows objects of this type to be
implicitly convertible to 'int' (the return type of
'opCall').
In other words, since opCall returns 'int', now we know S
objects can implicitly be used in place of an int. The
value will be determined by calling opCall.
For those of us who may not know opCall, it allows an
object to be used as a function. For example, when you
have an 'obj', you can do 'obj()'. (And as seen below, it
returns 'int' for this struct.)
(Note: It confused me for a bit because there are two
opCall definitions below and they both return
'int'. However, there is no ambiguity because the compiler
picks the one that takes no parameter for the following
alias this.) */
alias opCall this;
this(int i) {
value = i;
}
/* I didn't know one could do the following. You are giving a
new name (opAssign) to opCall. I wonder whether the
compiler considers opCall for the assignment operation or
whether it looks for a proper opAssign definition. (Too
lazy to check...) */
alias opAssign = opCall;
/* This is the function call operator that takes an 'int',
supporting usages like obj(42). */
@property opCall(int x) {
return value = x;
}
/* This is the function call opCall that takes nothing,
supporting usages like obj(). */
@property opCall() inout {
return value;
}
/* This is the operator overload for usages like 'obj += 42'. */
@property opOpAssign(string op)(int x) {
write(":"); // came here before
mixin("return value"~op~"=x;");
}
// no need: opUnary(string op)();
}
void main()
{
/* Ok, this is regular object construction. */
S a = S(10),
/* Using a comma above is something I would never do but 'b' is
another object being constructed regularly. */
b = S(-1);
/* Since S does not define the '+' operation, I think the
compiler looks and finds an implicit conversion, which
happens to be to 'int'. I think the following expression
is addition of two ints: 10 + (-1)' */
writeln(a + b); // 9
/* Although S does not support the ++ operator, the D
compiler finds the += operation and replaces ++ with
a+=1. And then a is implicitly converted to 'int', gets the
value 11. Again, the expression is an int addition of 11 +
(-1). */
writeln(++a + b); // :10
/* This uses opOpAssign. */
a += 10; // :
/* This result makes sense. */
assert(a == 21);
writeln("\n--");
writeln(-b); // 1
}
Ali
Re: Is there such concept of a list in D?
On Saturday, 10 December 2022 at 15:59:07 UTC, Ali Çehreli wrote: There isn't a single point in favor of linked lists. Yes there is, there are still special cases where linked lists can be a better alternative. Especially a version with intrusive members (with next/prev pointers as members in your object) The intrusive linked list doesn't need any extra allocation apart from the object itself which means less fragmentation and small container allocations. The double linked list has O(1) insert and delete, arrays has not. The single linked list offer completely lockless variants, which is also completely unbounded. The intrusive linked list has better performance with everything, except random access. You can move/splice entire lists without copying. The linked list performs equally well regardless of number of objects or object size. The performance of arrays depend on this. As CPUs has progressed the array has become more favorable than the linked list type that is being offered by most standard libraries (the one that must allocate container objects, not intrusive). For most programming practices the array is usually the best. However, there are occasions where the linked list can be worth to be considered.
Re: No need opUnary
On Monday, 19 December 2022 at 07:32:02 UTC, j wrote: Was my email deleted? Which compiler are you using? Are you an AI engine? SDB@79
Provisioning C libraries in Windows CI builds
I just tried activating Linux and Windows CI for https://code.dlang.org/packages/gmp-d via https://github.com/nordlow/gmp-d/.github/workflows/d.yml Linux passes but the Windows builds all fail because `gmp.lib` is not provisioned in the Windows CI. This is new to me so I need some initial guidance as I'm suspecting there are multiple package managers or direct sources download methods available for getting gmp.lib provisioned locally so linking finds `gmp.lib`. gmp is available via https://vcpkg.io/en/packages.html is that the preferred way?
