On Friday, 12 March 2021 at 22:18:59 UTC, tsbockman wrote:
Why do you think you need a `void[]` slice? I think `void*`
pointers are sufficient. This handles all normal data types, as
long as they are allocated on the GC heap:
I wanted to have the registry own the structs' memory, though
using
On Friday, 12 March 2021 at 18:14:12 UTC, Imperatorn wrote:
On Friday, 12 March 2021 at 17:57:06 UTC, David Zhang wrote:
On Friday, 12 March 2021 at 17:46:22 UTC, Imperatorn wrote:
On Friday, 12 March 2021 at 17:37:43 UTC, David Zhang wrote:
[...]
Have you tried using Variant or jsvar
(ht
On Friday, 12 March 2021 at 18:50:26 UTC, tsbockman wrote:
The idea is to implement a service locator s.t. code like this is
possible:
// struct (I didn't mention this in the top post, my mistake)
auto log = Logger()
api_registry.register!Logger(log);
// class/interface
On Friday, 12 March 2021 at 17:46:22 UTC, Imperatorn wrote:
On Friday, 12 March 2021 at 17:37:43 UTC, David Zhang wrote:
I want to store interfaces as untyped void[], then cast them
back to the interface at a later time. However, it appears to
produce garbage values on get().
Is this even po
I want to store interfaces as untyped void[], then cast them back
to the interface at a later time. However, it appears to produce
garbage values on get().
Is this even possible, and if so, what is happening here? The
alternative would be a struct { CheckedPtr self; api_fns }
e.g.
void
Ah, fair enough.
On Saturday, 1 June 2019 at 13:00:50 UTC, ag0aep6g wrote:
How is setting/replacing different from modifying?
e.g.:
S s;
this() { s = ...; }
update(S s) { this.s = s; }
mod(int i) { s.i = i; } // illegal
Kinda like how strings can be copied and assigned to, but not
modifie
On Saturday, 1 June 2019 at 16:30:12 UTC, Jonathan M Davis wrote:
If any member variable of a struct is const, then you can't
modify that member ever, and assignment isn't possible unless
you override opAssign so that it overwrites only the mutable
members. It's very rare that it makes sense to
Say I have a struct `S`:
struct S {
/*const*/ char* pointer;
... other members ...
this(/*const*/ char* p, ... others ...) {
pointer = p;
...
}
}
What I want, is to be able to use `S` in other data structures
with the following pr
On Saturday, 10 February 2018 at 22:59:18 UTC, ag0aep6g wrote:
But there is a recent regression on Windows that might be
related. Do you also have a static constructor (`static this`)
that uses `wndclassName`? If so, you might be hitting issue
18412.
https://issues.dlang.org/show_bug.cgi?id=1
Building with Visual Studio seems to be fine. This isn't an
OptLink issue, is it?
On Saturday, 10 February 2018 at 22:36:41 UTC, ag0aep6g wrote:
On 02/10/2018 11:26 PM, David Zhang wrote:
I've got an immutable string declared in module scope, and I
attempted to get a pointer to its characters through both
&str[0] and str.ptr. However, it appears to me that the string
is beh
Hi,
I've got an immutable string declared in module scope, and I
attempted to get a pointer to its characters through both &str[0]
and str.ptr. However, it appears to me that the string is
behaving like a manifest constant, in that the pointer is null.
The language reference indicates that i
On Tuesday, 21 November 2017 at 19:05:21 UTC, Jonathan M Davis
wrote:
Well, the assertion is going to throw an AssertError, which
takes a string for its message. It doesn't copy the contents of
the string. It's just taking a slice just like whenever you
pass a string to any other function. So,
On Tuesday, 21 November 2017 at 18:56:03 UTC, Adam D. Ruppe wrote:
On Tuesday, 21 November 2017 at 18:49:40 UTC, David Zhang
wrote:
assert(false, chars[0..str.length]);
}
What am I missing here?
You're escaping a reference to a local variable there. chars[]
is a pointer to the stack
Hi,
I've been trying to copy a string, then output it from an
`assert(false)` statement, but the copy seems to be corrupted
somehow.
void main()
{
string str = "some string";
//initializing `chars` with any value doesn't do anything
char[64] chars;
//char[64]
Huh, I think I did something weird. It compiles now, and I don't
know why. Thanks for your answers.
Hi,
Is there a way for a templated function to deduce or apply the
@safe/@nogc attributes automaticaly? I feel like I remember dmd
doing so at one point, but it doesn't appear to work anymore. In
particular, I need to call a function belonging to a templated
type, but do not know what attribu
On Thursday, 21 September 2017 at 19:49:14 UTC, ag0aep6g wrote:
I don't have a one-liner, but here are some other solutions
that might be interesting. None of them is particularly pretty,
though.
1) Recursive template:
2) Using the std library:
3) Declaring a packed struct in a function li
Given the function F, where: F(Args...)(Args args) { ... }
How can I statically determine the size of the argument list in
bytes?
Preferably, I would like a one-liner. However, std.algorithm
doesn't seem to support tuples, or `Args.each!(T =>
T.sizeof).sum` would work.
For the moment, I've
Nevermind! I rediscovered the `inout`attribute.
Though if I may say so, I have no idea how `inout` is supposed to
indicate "whatever the constness of a".
On Sunday, 17 September 2017 at 21:18:08 UTC, David Zhang wrote:
Hi,
I have a class `Image`, and I have a function called
`getSubImage(Rect bounds)`. What I can't figure out is how to
get the result of `getSubImage()` to take on the constness of
the backing image.
ie.
//The Image class
Hi,
I have a class `Image`, and I have a function called
`getSubImage(Rect bounds)`. What I can't figure out is how to get
the result of `getSubImage()` to take on the constness of the
backing image.
ie.
//The Image class is really just a view over a buffer that's
managed elsewhere
On Friday, 11 August 2017 at 04:50:48 UTC, rikki cattermole wrote:
On 11/08/2017 12:18 AM, David Zhang wrote:
I've been working on getting OpenGL to load on windows without
a library, and encountered something curious;
Context creation fails when I try to use the function pointer
retrieved th
I've been working on getting OpenGL to load on windows without a
library, and encountered something curious;
Context creation fails when I try to use the function pointer
retrieved through GetProcAddress, but works just fine with the
statically linked version provided through
core.sys.windows
On Sunday, 21 May 2017 at 10:03:58 UTC, Nicholas Wilson wrote:
As in the function signature of the function you call `ok` or
`error` in.
Result!(int, SomeEnum) myfunc(bool foo)
{
if(!foo)
return ok(42);
else
return error(SomeEnum.fooHappened);
}
should work.
This is w
On Sunday, 21 May 2017 at 09:37:46 UTC, Nicholas Wilson wrote:
On Sunday, 21 May 2017 at 09:29:40 UTC, David Zhang wrote:
Well then it becomes
Result!(T, E) ok(T,E) (T t) { return Result(t); }
Result!(T, E) error(T,E)(E e) { return Result(e); }
and then provided it can be inferred (e.g. f
On Sunday, 21 May 2017 at 09:15:56 UTC, Nicholas Wilson wrote:
have free functions
Result!(T, ErrorEnum) ok(T)(T t) { return Result(t); }
Result!(T, ErrorEnum) error(T)(ErrorEnum e) { return
Result(e); }
then go
if (!foo)
return ok(42);
else
return error(Error.fooHappened);
Ah, I
Hi,
I was reading a bit about this in Rust, and their enum type. I
was wondering if this is replicate-able in D. What I've got right
now is rather clunky, and involves using
`typeof(return).ok` and `typeof(return).error)`.
While that's not too bad, it does involve a lot more typing, and
On Tuesday, 9 May 2017 at 07:59:19 UTC, Stanislav Blinov wrote:
On Tuesday, 9 May 2017 at 07:50:33 UTC, David Zhang wrote:
If indeed there is no way to avoid allocation, do the
allocations have to remain 'alive' for the duration of the
instance? Or can I deallocate immediately afterwards? I c
On Tuesday, 9 May 2017 at 05:52:28 UTC, Mike Parker wrote:
On Tuesday, 9 May 2017 at 05:38:24 UTC, ag0aep6g wrote:
You have to create a new array of pointers. As rikki
cattermole has pointed out, you also have to null-terminate
the individual strings, and pass the amount of pointers in a
sepa
Hi,
I'm playing around with Vulkan, and part of its initialization
code calls for an array of strings as char**. I've tried casting
directly (cast(char**)) and breaking it down into an array of
char*s (char*[]) before getting the pointer to its first element
(&a[0]). It provides the correct t
Hi,
I have two structs and want to cast between them. The cast is
generalizable, so I want to keep it outside of the structs
themselves (I'll be adding more later). How can I do this? I've
tried the following so far:
struct Event {
EventID id;
ubyte[32 - EventID.sizeof] p
On Tuesday, 14 March 2017 at 02:14:53 UTC, evilrat wrote:
like this?
--
[snip]
-
there is also way to do this using templates and duck typing, I
think it will be more idiomatic way since ranges and stuff
heavily use it
On Monday, 13 March 2017 at 17:52:09 UTC, XavierAP wrote:
On Monday, 13 March 2017 at 02:15:21 UTC, David Zhang wrote:
What it says on the tin. Is there a way to create interfaces
with a constructor or must I use an abstract class.
What do you want to do in your constructor? I can't think of
What it says on the tin. Is there a way to create interfaces with
a constructor or must I use an abstract class.
Additionally, is there a way to force the linker to link a
function in a class without an implementation with another that
does have an implementation?
i.e.
---
//module a;
On Thursday, 16 February 2017 at 00:49:45 UTC, Adam D. Ruppe
wrote:
On Thursday, 16 February 2017 at 00:43:30 UTC, David Zhang
wrote:
struct S {
O object;
}
import std.typecons;
Rebindable!O object;
http://dpldocs.info/experimental-docs/std.typecons.Rebindable.html
Is there a similar
Hi,
Say I have a struct S that holds a reference to an object O. Is
there a way to express that I want to be able to change the
reference, but not what the reference points to? Thanks.
struct S {
O object;
}
class O {
size_t things.
}
Thanks for your answers. Out of curiosity though, how could
something like this be done with classes instead?
Hi,
I have a struct with two immutable members, and I want to make an
array of them. How do I to this? I'm using allocators for this.
string[] paths;
struct FileDesc {
immutable string path;
immutable uint index;
}
_fileDesc = /*something*/;
You can't use alloc.makeArray because it
I was trying to figure out why calling an object's function from
a wndProc that modified the object's state didn't actually change
anything. Wrapping the GetWindowLongPtr in a cast(void*) seems to
make it work. What am I missing about this? I though that object
references were really just point
So I have a window (Windows), and my wndProc is basically the
same as the one on the windows guides. However, even though
WM_CLOSE gets passed (and I can use if(msg == WM_CLOSE)), I can't
seem to set my shouldClose flag. I've confirmed that I still get
the event within my processMessage method.
On Saturday, 14 January 2017 at 22:17:23 UTC, ketmar wrote:
class ClassB: ClassA {
alias fun = super.fun;
override void fun(uint a) {}
}
I tried that, but it seems to think I mean to override
super.fun(uint) instead of super.fun(uint, float).
Looking at my code again, one of them is temp
Hello,
Say I have a class, and it overrides a function from its
superclass. However, the superclass has two overloaded versions
of the same function. My intent is to override only one of the
functions, but the second is rendered inaccessible from outside
of the class. How can I make the overl
On Saturday, 31 December 2016 at 02:36:01 UTC, rikki cattermole
wrote:
No, my understand is thus:
next = current.next;
theAllocator.dispose(current);
When current is deallocated, current is pointing to free'd
memory.
After that point it should be segfaulting when you try to
access it *I thi
On Saturday, 31 December 2016 at 02:03:07 UTC, rikki cattermole
wrote:
As it should, current is never reassigned.
You only need one var, next. Of course I didn't read the entire
thread chain so, I'm probably missing something.
import std.experimental.allocator;
void main() {
struct S
Extracting everything into a main() also causes the application
to hang.
ie:
struct S
{
S* next;
}
S* _foo;
foreach (e; 0 .. 10)
_foo = theAllocator.make!S(_foo);
S* next, current;
next = current = _foo;
while (next)
{
next = current.next;
theAllocator.dispose(current);
}
On Friday, 30 December 2016 at 22:42:07 UTC, Steven Schveighoffer
wrote:
What is actually happening is that the D main function returns.
Then the D runtime tears down everything, including joining all
threads, running all module static dtors, terminating the GC,
etc.
Then it returns to the OS
On Friday, 30 December 2016 at 20:59:30 UTC, Seb wrote:
On Friday, 30 December 2016 at 18:03:44 UTC, David Zhang wrote:
On Friday, 30 December 2016 at 14:12:35 UTC, Steven
Schveighoffer wrote:
[snip]
It depends on what is actually hanging the process. If it's
something in your code base only,
On Friday, 30 December 2016 at 14:12:35 UTC, Steven Schveighoffer
wrote:
[snip]
It depends on what is actually hanging the process. If it's
something in your code base only, then nobody else would be
seeing it.
-Steve
So, what should I do with it? I'd submit a bug report, but I
don't know
On Friday, 30 December 2016 at 01:25:50 UTC, Steven Schveighoffer
wrote:
Looks like that comes from here:
https://github.com/dlang/dub/blob/master/source/dub/dub.d#L577
I have serious doubts that this is the correct way to run
tests, as share ctors are supposed to have run BEFORE unit
tests a
On Friday, 30 December 2016 at 00:44:50 UTC, Steven Schveighoffer
wrote:
Where does the "All unit tests have been completed
successfully." message come from? That's not standard D, which
prints nothing.
-Steve
I should have mentioned that I use dub then, shouldn't I? Anyway,
this is what
On Thursday, 29 December 2016 at 20:50:54 UTC, David Zhang wrote:
On Thursday, 29 December 2016 at 20:33:33 UTC, Stefan Koch
wrote:
It would be very helpful if you could provide example code
that triggers that behavior.
I'd love to, but I'm not actually sure just what it is that
breaks it. I
On Thursday, 29 December 2016 at 20:33:33 UTC, Stefan Koch wrote:
It would be very helpful if you could provide example code that
triggers that behavior.
I'd love to, but I'm not actually sure just what it is that
breaks it. I can provide the git repo for one of them though
though:
https://
Hi,
I've noticed recently, that whenever I unittest, it program hangs
either at the very end, or right before they start. When using
vanilla unit tests, the program appears to hang after the "All
unit tests have been completed successfully." message, and I have
to force to program to exit. Ho
I haven't considered alignment here. I'm not sure if you have
to.
I though all classes were aligned to sizeof(size_t) boundaries?
Wouldn't it then just be
align(sizeof(size_t)) byte[__traits(classInstanceSize,
SomeClass)] scStorage;
On Thursday, 15 December 2016 at 21:08:51 UTC, ag0aep6g wrote:
On 12/15/2016 09:51 PM, David Zhang wrote:
However, it leaves me with another question, how
much (if any) space would the static array require from the
class?
Depends on SomeClass. The array's size is just the value of
__traits(c
Thank you for your responses. Visitor, I don't want any reference
to an allocator within the class if I can avoid it. ag0aep6g,
thanks! That's what I was looking for. However, it leaves me with
another question, how much (if any) space would the static array
require from the class? It's not a s
Hello,
It is my understanding that a class can have a struct as one of
its members, and it will be allocated in-line with the rest of
the class' members. My question is this; how might I be able to
do this with another class? I want to be able to allocate Foo
using std.experimental.allocator
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