Re: Generating a method using a UDA

2018-05-09 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 9 May 2018 at 10:16:22 UTC, Melvin wrote: class SomeNode : GodotScript!Node { @Signal void testSignal(float a, long b); // The declaration above would trigger the generation of this line void testSignal(float a, long b) { owner.emitSignal("testSignal", a, b); }

Re: Template to retrieve compile-time enum member from run-time enum member?

2018-04-27 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 27 April 2018 at 13:27:45 UTC, Timoses wrote: Bumped across another problem : / ``` import std.stdio; enum menum { A, B, C } void main() { foo(menum.A); } void foo(menum e) { writeln(instantiateWith!Temp(e)); } auto instantiateWith(alias Fn, T)(T x) if (is(T == enum))

Re: using Unsized Arrays in Structures from d?

2018-05-04 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 4 May 2018 at 13:02:08 UTC, NewUser wrote: How can I use the following c structure from d. struct Item { int id; }; struct Group { int i; int item_count; struct Item items[]; }; tried defining items[] as both "Item[] items" and "Item* items" in d, it compiles okay but

Re: Real Int24

2018-05-21 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 19 May 2018 at 18:44:42 UTC, IntegratedDimensions wrote: On Saturday, 19 May 2018 at 18:19:35 UTC, IntegratedDimensions wrote: Is there any way to create an int24 type that behaves just like any other built in type without having to reimplement everything? In fact, what I'd like

Re: UDA and static struct fields

2018-05-24 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 24 May 2018 at 07:47:54 UTC, Andrea Fontana wrote: Is this a bug or am I missing something? https://run.dlang.io/is/OGHJYX Andrea This line: mixin("alias tmp = " ~ s ~ ";"); There's no mention of Symbol in there. If you change it to this: mixin("alias tmp =

Re: Is there a better way to do this? (Using class at compile-time)

2018-06-12 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 12 June 2018 at 11:04:40 UTC, bauss wrote: [snip] void test(T)() { pragma(msg, (getBar!T).baz()); pragma(msg, (getBar!T).helloworld()); import std.stdio; mixin((getBar!T).baz()); mixin((getBar!T).helloworld()); } [snip] Is there a way to avoid having to write

Re: Create an Algebraic type at compile time and more

2018-06-15 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 15 June 2018 at 10:53:35 UTC, uknys wrote: On Friday, 15 June 2018 at 07:27:22 UTC, Simen Kjærås wrote: [snip] Yeah I saw that Algebraic doesn't work at compile time, then I thought of using an Interface with one function (execute()) and making Hello and Toto as classes

Re: Create an Algebraic type at compile time and more

2018-06-15 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 14 June 2018 at 19:15:38 UTC, uknys wrote: Hello, I wanted to know if such code was possible : alias Operation = Algebraic!(/* All type that implements X UDA */) struct X { int opcode; Operation h; } @X(0x01, Hello(3)) @X(0x02, Hello(4)) struct Hello { int Hello; }

Re: string mixin output works when directly used but when generator is used D fails

2018-05-30 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 29 May 2018 at 21:19:01 UTC, DigitalDesigns wrote: https://dpaste.dzfl.pl/67691db19ce8 Simplified: interface A { import std.meta : AliasSeq; alias a = AliasSeq!(__traits(getMember, B, "foo")); void foo(); } class B : A { void foo() { } } It seems the compiler is

Re: Logging inside struct?

2018-05-30 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 30 May 2018 at 09:58:16 UTC, biocyberman wrote: How do I add logging for this struct? https://run.dlang.io/is/9N6N4o If not possible, what's the alternative? This line: writeln("got num: %s, of type: %s", num, typeof(num)); Gives this error message: onlineapp.d(7):

Re: Build interface from abstract class

2018-05-30 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 28 May 2018 at 20:13:49 UTC, DigitalDesigns wrote: I do not think this is a problem in D. Infinite recursion can always be terminated with appropriate means. 1. Use attributes. methods in class A should be marked as being for the interface. When added to the interface they will not

Re: New programming paradigm

2018-06-03 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 3 June 2018 at 14:57:37 UTC, DigitalDesigns wrote: On Sunday, 3 June 2018 at 09:52:01 UTC, Malte wrote: You might want to have a look at https://wiki.dlang.org/Dynamic_typing This sounds very similar to what you are doing. I never really looked into it, because I prefer to know

Re: Confusion/trying to understand CTFE keywords

2018-06-05 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 5 June 2018 at 09:36:22 UTC, Gopan wrote: void main() { immutable n = __ctfe ? 1 : 2; int[n] a; assert(a.length == n); // fails, wat } That's gotta be a bug - that should give a 'variable n cannot be read at compile time' error. The fact that n is immutable shouldn't

Re: Functor alias this

2018-06-06 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 6 June 2018 at 06:25:49 UTC, DaggetJones wrote: Hi, I'm wondering how I should approach supplying functions/delegates around in D. I have option of using classes where the function exists inside the class and to provide different functionality different classes are created.

Re: Why 'getSymbolsByUDA' filters private members?

2018-05-27 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 27 May 2018 at 17:42:15 UTC, Sobaya wrote: I'd like to get symbols that have an UDA. But when the member is private, it is not obtained. And I found a comment saying "Filtering inaccessible members" in the source. Why is it necessary to filter out private members? Since the

Re: Build interface from abstract class

2018-05-28 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 28 May 2018 at 09:59:50 UTC, DigitalDesigns wrote: Implementing interfaces can be a pain but are necessary. I like to use abstract classes and provide a base implementation. It would be cool if I could use D's awesome meta features to extract the interface from the abstract class

Re: how to define infix function

2018-06-02 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 2 June 2018 at 22:09:49 UTC, Neia Neutuladh wrote: On Saturday, 2 June 2018 at 21:44:39 UTC, greatsam4sure wrote: Sorry for the typo is it possible to define infix function in D 3.min(5)// 3: where min is a function, works in D 3 min 5 // does not work. thanks in advance This

Re: template alias that includes a parameter

2018-07-01 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 1 July 2018 at 09:46:55 UTC, Timoses wrote: Would be nice if std.meta.ApplyLeft did the job here.. Is there no way of achieving that? [snip] Would have to find a way to determine whether Template would resolve to a function or not. Can't find anything in Traits[1] or std.traits[2].

Re: 0xC0000005: 0x0000000000000000 access violation...

2018-07-02 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 1 July 2018 at 22:04:05 UTC, Robert M. Münch wrote: On 2018-07-01 09:05:56 +, Robert M. Münch said: This one look nasty... And it was... the problem was, that I kept D allocated pointers in C code without informing the GC that the memory can't be collected nor moved.

Re: Determine if CTFE or RT

2018-06-25 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 25 June 2018 at 09:36:45 UTC, Martin Tschierschke wrote: I am not sure that I understood it right, but there is a way to detect the status of a parameter: My question was different, but I wished to get a ctRegex! or regex used depending on the expression: import

Re: template alias that includes a parameter

2018-06-30 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 30 June 2018 at 21:11:54 UTC, Anonymouse wrote: I have a template that I want to provide easy aliases for, where the aliases includes (partially applies?) a template parameter. void fooImpl(char token, T)(const T line) { // ... } alias quoteFoo(T) = fooImpl!('"', T); alias

Re: Template to retrieve compile-time enum member from run-time enum member?

2018-04-26 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 26 April 2018 at 16:10:16 UTC, Timoses wrote: Is it possible to use a template to place the "static foreach" looping to find the correct enum value into? Like I am trying in the initial "draft" GetMenum? As the compiler says, the value of `e` is not known at compile-time. In

Re: Checking @nogc-ness of an Allocator.allocate()

2018-01-11 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 11 January 2018 at 12:32:54 UTC, Per Nordlöw wrote: Is this an ok implementation: enum bool isNogc(alias fun) = (isCallable!fun && (functionAttributes!fun & FunctionAttribute.nogc)); @safe pure nothrow @nogc unittest {

Re: Is it possible to append to a local buffer without reallocating?

2018-01-11 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 11 January 2018 at 11:21:08 UTC, tipdbmp wrote: string push_stuff(char[] buf, int x) { if (x == 1) { buf ~= 'A'; buf ~= 'B'; buf ~= 'C'; return cast(string) buf[0 .. 3]; } else { buf ~= 'A'; buf ~= 'B'; return

Re: Getting a Type from TypeInfo / Getting Variant Type

2018-01-11 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 11 January 2018 at 08:59:01 UTC, Chirs Forest wrote: I'm using std.variant.Variant to hold a value of unknown type (not a string, could be a numeric type or a container holding multiple numeric types). I'm trying to retrieve this value with .get!T but I need the type to do that...

Re: Single type of a tuple return type function

2018-01-04 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 4 January 2018 at 15:50:35 UTC, Vino wrote: Hi All, Request your help, on how o find the single type of a tuple return type function, eg, auto Fn (){ Array!string a; Array!int b; Array!ulong c; return tuple(a, b, c); } if we use "ReturnType!Fn" it gives us the output as

Re: Is old style compile-time foreach redundant?

2018-01-06 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 6 January 2018 at 23:25:58 UTC, Ali Çehreli wrote: Is 'static foreach' sufficient for all needs or is there any value for regular foreach over compile-time sequences? There is, as far as I've seen, there's nothing old foreach-over-tuple can do that new-style static foreach can't.

Re: Cannot use local lambda as parameter to non-global template

2018-01-15 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 15 January 2018 at 13:55:57 UTC, Nordlöw wrote: Why do I get errors like template instance remove!((_) => _ == 1) cannot use local '__lambda5' as parameter to non-global template remove()(in K key) for x.remove!(_ => _ == 1); but not for x.remove!"a == 11"; ? How are

Re: What's equivalent to C#'s select?

2018-01-15 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 15 January 2018 at 15:24:50 UTC, Marc wrote: I just thought that filter() could be evaluated at compile time too, as others function that I've used so far. Sometimes I don't know if a native function can be evaluated at compile time until I do enum x = func(); Yeah, it takes some

Re: Local static variables must have unique names within a function's scope.

2018-01-19 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 19 January 2018 at 11:02:01 UTC, tipdbmp wrote: The following seems to work in C++, but errors in D, why is that? int foo(int* num) { { static int x = 10; x += 1; *num += x; } { static int x = 20; // error: foo.x is already defined in

Re: How to manage function's parameter storage class?

2018-01-20 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 20 January 2018 at 14:31:59 UTC, Sobaya wrote: How can I wrap function whose arguments contain both ref and normal like 'func' ? With normal 'Args', x is not increased because x is copied when passed to opDispatch. If I write 'ref Args' in opDispatch's argument, it fails because

Re: What's equivalent to C#'s select?

2018-01-14 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 14 January 2018 at 22:07:22 UTC, Marc wrote: thanks, can i use it at compile time as well? enum isMutableString(string field) = is(typeof(__traits(getMember, >C, field)) == string); static foreach(field; [FieldNameTuple!C].filter!(f => isMutableString!(f))) {

Re: Can you introspect predicate arity and if it's an equality predicate?

2018-01-12 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 12 January 2018 at 00:16:07 UTC, aliak wrote: Hi, so basically is there a way to: void func(alias pred = null, Range)(Range range) { // 1) check if pred(ElementType!Range.init, ElementType!Range.init) is equality // 2) check if isUnary!pred // 3) check if isBinary!pred }

Re: Rewriting a c++ template to D (replacing iterator with ranges "properly")

2018-01-26 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 26 January 2018 at 14:16:04 UTC, aliak wrote: It basically steps through in a stride and sets the checkpoints to false. C++: template N> void mark(It begin, It end, N step) { assert(begin != end) *begin = false; while (end - begin > step) { begin = begin + step;

Re: value of 'this' is not know at CT for typeof(this)

2018-01-26 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 26 January 2018 at 20:08:19 UTC, Dechcaudron wrote: So I'm trying to get this to compile: ``` static foreach (alias member; getSymbolsByUDA!(typeof(this), Serialize)) serializeMember!member(bundle); ``` And I'm getting the following error: value of 'this' is not

Re: Rewriting a c++ template to D (replacing iterator with ranges "properly")

2018-01-26 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 26 January 2018 at 15:33:03 UTC, aliak wrote: On Friday, 26 January 2018 at 14:35:25 UTC, Meta wrote: On Friday, 26 January 2018 at 14:16:04 UTC, aliak wrote: 1) I've seen some phobos code checking for assignability like this: is(typeof(range.front = false)) ... is that an

Re: Help me understand how to contribute to bugs report / fixing

2018-01-26 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 26 January 2018 at 20:43:05 UTC, Fra Mecca wrote: What should I do now? I am undecided between: - commenting on the bug tracker and close the bug - link the pr 6056 on the bug tracker - leaving it be Leaving a comment on the bug with a link to the PR, and marking the bug resolved

Re: Discarded return values

2018-01-30 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 30 January 2018 at 14:01:00 UTC, bauss wrote: unittest { auto a = foo(); // This should fail, because a is never used. No it shouldn't. It is assigned to a variable, as the constraint said. // This should also fail, because b is never used actually used

Re: Best Practice: Alternatives to Void Pointers

2018-01-30 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 30 January 2018 at 17:41:53 UTC, jsako wrote: So what's considered the best alternative to void pointers in D if you don't want to use objects? Make a tagged Union of all possible datatypes in the struct? Have a Byte array and cast that instead of a void pointer? Some sort of magic

Re: Should the "front" range primitive be "const" ?

2018-01-30 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 31 January 2018 at 01:45:57 UTC, H. S. Teoh wrote: .headConst .headMutable. :p Head-const is something we generally want to avoid. -- Simen

Re: Lambda returning a lambda?

2018-02-01 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 1 February 2018 at 11:51:11 UTC, aliak wrote: Is there a way to do this: import std.stdio; void main() { alias f = (a) => (b) => a * b; f(2)(3).writeln; } The problem here is the outer lambda doesn't know what type the inner lambda is. We can rewrite this a bit: auto

Re: the behavior of opAssign

2018-01-29 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 29 January 2018 at 09:23:55 UTC, Sobaya wrote: I found a strange behavior. class A { void opAssign(int v) {} } class Test { A a; this() { a = new A(); // removing this causes compile error. a = 3; // cannot implicitly convert expression `3` of `int` to

Re: questions around mutating range algorithms, const, and return ref

2018-01-29 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 29 January 2018 at 11:36:26 UTC, aliak wrote: You don't want to mutate const elements anyway. It would be breaking a promise that other parts of the program may be depending on. I would return a filtered-out range: Right, I want to mutate the range though, not the elements. So

Re: Should the "front" range primitive be "const" ?

2018-02-01 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 1 February 2018 at 18:58:15 UTC, H. S. Teoh wrote: However, if we go back to the idea of tail-const, we could potentially eliminate the need for casts and also avoid breaking immutable. Basically, the problem with writing const(RefCounted!T) is that it's a one-way street: on the

Re: Should the "front" range primitive be "const" ?

2018-01-31 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 31 January 2018 at 01:45:57 UTC, H. S. Teoh wrote: I haven't thought through it carefully, but if .headConst is a viable solution to the head-const problem, then conceivably we could also extend it to deal with immutable payloads too. Then we could go from, say,

Discarded return values

2018-01-30 Thread Simen Kjærås via Digitalmars-d-learn
Is there a way to get a compile error when returning a temporary from a function and then not assigning it to a variable or passing it to a different function? E.g: struct S { int[] a; void morph() {} } @warnOnDiscard S foo() { return S([1,2,3]); } unittest { auto a = foo();

Re: Discarded return values

2018-01-30 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 30 January 2018 at 11:36:25 UTC, Jonathan M Davis wrote: [nope] Thanks. It's what I thought, though not what I wanted. IIRC, the Weka guys wanted to be able to have attributes tell the compiler stuff so that it could yell at the programmer when appropriate, so I think that there

Re: Should the "front" range primitive be "const" ?

2018-02-04 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 2 February 2018 at 14:29:34 UTC, H. S. Teoh wrote: Its semantics are not broken; it's just harder to use. Due to const transitivity, it's an all-or-nothing deal. .tailConst gives us the middle ground. If the semantics of const means that users will have to write .tailConst all

Re: typedef behavior

2018-02-12 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 12 February 2018 at 09:10:52 UTC, Alex wrote: A more extreme example: You have a compiled library, and some .di (header) files. In one of those files is this code: struct S { static int[] arr; void foo(); } Now how should Typedef go about making foo() do the right thing?

Re: typedef behavior

2018-02-12 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 12 February 2018 at 09:58:13 UTC, Alex wrote: On Monday, 12 February 2018 at 09:37:56 UTC, Simen Kjærås wrote: Not really, since D doesn't have a concept of an address associated with a type, only with instances of it. So when you use a static array, the address is hard-coded.

Re: typedef behavior

2018-02-12 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 11 February 2018 at 19:33:23 UTC, Alex wrote: On Sunday, 11 February 2018 at 15:18:11 UTC, Simen Kjærås wrote: Basically, Typedef looks like this: struct Typedef(T) { T _payload; // Forward method calls, member access, etc, to _payload. } If T looks like this: struct T {

Re: What does "(this This)" mean in member function templates?

2018-02-12 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 12 February 2018 at 08:35:05 UTC, Nathan S. wrote: For example in std.container.rbtree: --- auto equalRange(this This)(Elem e) { auto beg = _firstGreaterEqual(e); alias RangeType = RBRange!(typeof(beg)); if (beg is _end || _less(e, beg.value))

Re: typedef behavior with @disable this()

2018-02-10 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 10 February 2018 at 13:18:28 UTC, Alex wrote: Do I overlook something? /// --- code --- /// import std.typecons; void main(){} static assert(!__traits( compiles, E())); static assert(!__traits( compiles, MyE())); // line 6 struct E { size_t dummy; @disable

Re: typedef behavior

2018-02-11 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 11 February 2018 at 01:32:52 UTC, Alex wrote: On Saturday, 10 February 2018 at 02:55:26 UTC, Alex wrote: bug filed https://issues.dlang.org/show_bug.cgi?id=18416 Basically, Typedef looks like this: struct Typedef(T) { T _payload; // Forward method calls, member access,

Re: return type based on content of an array

2018-02-21 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 21 February 2018 at 06:45:14 UTC, thorstein wrote: Hi, I'm going circles... ;) I read a string that contains an array of unknown dimension like: a = [1,2,3,4] or a = [[1,2],[3,4]] or a = [[[1,2],[3,4]],[[5,6],[7,8]]] With that I want to perform specified operations e.g. also

Re: How to instantiate a template struct with a template constructor without relying on auto deduction?

2018-02-21 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 21 February 2018 at 14:11:10 UTC, ParticlePeter wrote: struct Foo(T) { T bar; this(S)(S s) { bar = convert(s); } } auto foo = Foo!int(some_float); this works because S is deduced as typeof(some_float), but how would I instantiate the struct without relying on auto

Re: How to instantiate a template struct with a template constructor without relying on auto deduction?

2018-02-21 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 21 February 2018 at 14:29:38 UTC, ixid wrote: I do not understand what is happening here, I tried to wrote what I thought would be the answer. If someone could explain that would be great. I wrote this code: struct Foo2(T, S) { T bar; this(S s) { bar = s.to!T; } }

Re: Could that bug be catch using D's way?

2018-02-19 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 19 February 2018 at 12:58:45 UTC, Marc wrote: I'm pretty sure something could be done with Ada's type range but what we could do using D? We can easily define a range type in D. The simple example below probably has awful performance and many holes, but outlines the basic idea. It

Re: Generic Property Implementation

2018-02-20 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 20 February 2018 at 14:34:53 UTC, bauss wrote: Would there be a reason why this wouldn't be a good implementation? What is the intended use case for this? The main feature seems to be an ability to have read-only members, which is nice. Are there other benefits? If so what

Re: Could that bug be catch using D's way?

2018-02-19 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 19 February 2018 at 13:33:34 UTC, rikki cattermole wrote: https://dlang.org/phobos/std_experimental_checkedint.html#.Checked.min Can't seem to get that to work, so I assumed it's not meant to be used that way: import std.experimental.checkedint; struct MyHook { enum min(T) =

Re: Could that bug be catch using D's way?

2018-02-19 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 19 February 2018 at 14:20:16 UTC, Basile B. wrote: I had never used Checked and i discover that strangely there's no hook for opAssign. onLowerBound and onUpperBound works for +=, -=, *=, /=, %=, ^^=, &=, |=, ^=, <<=, >>=, and >>>=. But since init is 0, += works: Ah, thanks. Filed

Re: why @property cannot be pass as ref ?

2018-01-03 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 30 December 2017 at 03:49:37 UTC, ChangLong wrote: What I am try to do is implement a unique data type. (the ownership auto moved into new handle) Have you considered std.typecons.Unique[0]? If yes, in what ways does it not cover your needs? Your example code written with

Re: Get static fields!

2018-06-19 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 16 June 2018 at 05:05:19 UTC, DigitalDesigns wrote: tupleof does not return static fields as does not Fields. Currently the only method seems to be use allMembers, but that returns members requiring filtering, which there is no good filtering checks. I'd simply like to get all the

Re: Disabling opAssign in a type disabled all the opAssigns of an aliased type?

2018-07-30 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 30 July 2018 at 18:30:16 UTC, aliak wrote: Is this a bug? If not is there a workaround? I would like for the alias this to function as a normal A type unless B specifically disables certain features, but it seems weird that disabling one opAssign disables all of them inside the

Re: Disabling opAssign in a type disabled all the opAssigns of an aliased type?

2018-08-01 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 31 July 2018 at 20:40:25 UTC, Steven Schveighoffer wrote: OK, so one thing to learn in D, you can't hijack stuff. When you override a function, you have to override ALL the overloads. I could have sworn I tested this before I wrote that it's a bug: struct A { void fun(int) {}

Re: Disabling opAssign in a type disabled all the opAssigns of an aliased type?

2018-07-31 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 30 July 2018 at 23:41:09 UTC, aliak wrote: https://issues.dlang.org/show_bug.cgi?id=19130 Beautiful. :) Would it take much to fix it up to use with templated opAssigns as well? I spent half an hour doing silly things, then I came up with this: struct A { void opAssign(int)

Re: Why does not UFCS work for method defined inside unittest block?

2018-07-31 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 31 July 2018 at 08:28:01 UTC, Ky-Anh Huynh wrote: Hi, Can I define a new quick function to use inside a unittest block? I have the following code: [code] auto foo(string[] sta) { return sta; } auto bar(string[] sta) { return sta; } auto h(string[] sta) { return

Re: Disabling opAssign in a type disabled all the opAssigns of an aliased type?

2018-07-31 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 31 July 2018 at 07:01:33 UTC, Simen Kjærås wrote: auto opAssign(T...)(T args) Admittedly, one rarely uses multi-argument opAssign, but for those rare occasions... :p -- Simen

Re: How to force console

2018-08-02 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 2 August 2018 at 12:08:50 UTC, Everlast wrote: On Thursday, 2 August 2018 at 03:20:30 UTC, Mike Parker wrote: On Wednesday, 1 August 2018 at 20:57:30 UTC, Everlast wrote: I can create a console for a dll using AllocConsole and special Write functions but this is a pain. How do I

Re: GC and void[N] in struct

2018-08-07 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 6 August 2018 at 19:43:17 UTC, Steven Schveighoffer wrote: On 8/6/18 2:59 PM, vit wrote: struct ExprImpl(Ts...){     enum N = max(staticMap!(sizeOf, Ts)); This is clever! No need to be clever though - we've got std.traits.Largest for exactly this kind of purpose. -- Simen

Re: Enum and CTFE function call

2018-08-14 Thread Simen Kjærås via Digitalmars-d-learn
On Tuesday, 14 August 2018 at 09:17:41 UTC, ixid wrote: On Tuesday, 14 August 2018 at 09:12:30 UTC, ixid wrote: This will not compile as it says n is not known at compile time... This does work if 'value' is changed to immutable and fun to accept it. So it still seems like a missed

Re: is this a bug ? mixin template static function missing!

2018-08-10 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 10 August 2018 at 11:17:10 UTC, learnfirst1 wrote: I think the static extern(C) nested function should just work like global extern(C) function. DMD still report missing symbols. Or I am wrong about this ? template G(){ static extern(C) pragma(crt_constructor) void

Re: is this a bug ? mixin template static function missing!

2018-08-10 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 10 August 2018 at 08:31:21 UTC, learnfirst1 wrote: #!/usr/bin/env rdmd import core.stdc.stdio; template G(size_t line = __LINE__, A...){ int i = 3; static extern(C) pragma(crt_constructor) void init2(){ printf("init: %d\n", line); } }

Re: templated lambda with {} cause GC

2018-08-10 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 10 August 2018 at 09:57:53 UTC, learnfirst1 wrote: T!(t => { printf("test 2 name = %s\n".ptr, t.name.ptr); }, "test") ; // build error This is not doing what you think it's doing. The syntax t => { return t; } is equivalent to t => () => t. That is,

Re: variable _param_0 cannot be read at compile time

2018-08-08 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 8 August 2018 at 12:57:43 UTC, learnfirst1 wrote: Why this is a error ? ``` struct S { bool v; string x; } S* add(A...)(ref A a) { __gshared s = S(a); return } void main(){ auto p = add(true); } ``` test.d(9): Error: variable _param_0

Re: [Unit tests] Mocking D objects

2018-08-22 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 22 August 2018 at 08:33:36 UTC, Andrey wrote: Hello, I know that D has build-in unit tests. If so, what mechanism D provides for mocking objects? For example: struct WebParser { // ... int download(string path) { SomeHttpClient client(path); auto result =

Re: Null-Coalescing Operator and Extensions

2018-08-28 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 27 August 2018 at 14:59:20 UTC, SG wrote: On Monday, 27 August 2018 at 07:59:17 UTC, Simen Kjærås wrote: That's the null propagation operator (?.). What SG asked for is the null-coalescing operator (??). Of course, this can also be implemented in D (albeit with a slight more

Re: Using .length returns incorrect number of elements

2018-08-19 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 19 August 2018 at 16:03:06 UTC, QueenSvetlana wrote: On Sunday, 19 August 2018 at 15:53:25 UTC, Chris M. wrote: On Sunday, 19 August 2018 at 15:49:18 UTC, Chris M. wrote: On Sunday, 19 August 2018 at 15:44:07 UTC, QueenSvetlana wrote: [...] auto appendNumber =

Re: Null-Coalescing Operator and Extensions

2018-08-27 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 25 August 2018 at 19:16:26 UTC, Jacob Carlborg wrote: On 2018-08-25 15:33, SG wrote: Hi, 1) I program in C# and I'm wondering if there is something like ?? (Null-Coalescing Operator) in D? (I remember some proposals in the past). Not in the language but it can be implemented

Re: Templated operator overloading

2018-08-22 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 22 August 2018 at 11:58:25 UTC, XavierAP wrote: When I want to have the same operator overloading code in both types however, I can't make it work: From https://dlang.org/spec/operatoroverloading.html#binary: "the one with the ‘better’ match is selected. It is an error for both

Re: How to map elements of a tuple?

2018-08-22 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 22 August 2018 at 10:36:32 UTC, Andrey wrote: Hello, Is there a template/function/mixin... in the library that I can use to map elements of a tuple? object.foo(Mapper!myMapFunction(1, bool, "Qwerty", EnumedColor.Red)); where "Mapper" is this mapper and "myMapFunction" is a

Re: Set optional function parameter

2018-08-18 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 17 August 2018 at 08:52:53 UTC, Andrey wrote: I mean - can I skip some arguments and set only one that I want? Hm, Python, it seems to me, support this feature. There's no such built-in functionality in the language or standard library, no. As Jonathan pointed out, this has been

Re: hasUDA with this

2018-07-20 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 19 July 2018 at 19:18:43 UTC, jmh530 wrote: However, it seems like hasUDA doesn't seem to produce the result I would have expected here. I tried using getAttributes, but that didn't work either. Am I missing something, or should I submit an enhancement request? UDAs apply to

Re: Implicit conversion of struct with methods to immutable in pure function fails

2018-07-17 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 16 July 2018 at 13:13:53 UTC, Timoses wrote: On Monday, 16 July 2018 at 12:00:57 UTC, Simen Kjærås wrote: On Monday, 16 July 2018 at 11:43:03 UTC, Timoses wrote: Why does this fail? It doesn't. Not using DMD 2.081.1 under Windows, at least. I tried adding a bitfield since you

Re: Disabling struct destructor illegal?

2018-07-19 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 19 July 2018 at 10:04:34 UTC, RazvanN wrote: I just don't understand why you would ever mark the destructor of a struct with @disable. When is that useful? If it's not, why not just forbit it? struct S1 { ~this() { /* stuff */ } } struct S2 { S1 s; @disable ~this();

Re: Implicit conversion of struct with methods to immutable in pure function fails

2018-07-19 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 18 July 2018 at 11:28:54 UTC, Timoses wrote: But why is a context pointer a problem? Is it problematic because the context pointer to the main scope can not guarantee `immutable`? E.g. if I happened to use data from main in a function of the immutable struct then... well then

Re: Implicit conversion of struct with methods to immutable in pure function fails

2018-07-16 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 16 July 2018 at 11:43:03 UTC, Timoses wrote: Why does this fail? It doesn't. Not using DMD 2.081.1 under Windows, at least. I tried adding a bitfield since you mentioned it, but it compiles nicely for me. Which version of DMD are you using, and are you having the issues with the

Re: Bug with writeln?

2018-09-06 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 6 September 2018 at 08:40:08 UTC, Saurabh Das wrote: Is this a bug with writeln? Yup. What happens is writeln destructively iterates over b[i]. Since b[i] is a forward range, this shouldn't be done destructively. Instead, a copy should be made using b[i].save, somewhere deep in

Re: Bug with writeln?

2018-09-06 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 6 September 2018 at 09:06:21 UTC, Simen Kjærås wrote: On Thursday, 6 September 2018 at 08:40:08 UTC, Saurabh Das wrote: Is this a bug with writeln? Yup. What happens is writeln destructively iterates over b[i]. Since b[i] is a forward range, this shouldn't be done

Re: hasAliasing with nested static array bug ?

2018-09-06 Thread Simen Kjærås via Digitalmars-d-learn
On Wednesday, 5 September 2018 at 22:35:16 UTC, SrMordred wrote: https://run.dlang.io/is/TOTsL4 Yup, that's a bug. Reduced example: struct S { int*[1] arr; } import std.traits : hasAliasing; static assert(hasAliasing!S); Issue filed: https://issues.dlang.org/show_bug.cgi?id=19228 Pull

Re: how to do template constraints with variadic templates ?

2018-07-07 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 8 July 2018 at 00:52:41 UTC, Flaze07 wrote: On Sunday, 8 July 2018 at 00:46:13 UTC, Flaze07 wrote: I want to force the variadic templates's type to be of certain types, I thought doing this would work auto sum( A... )( A a ) if( isIntegral!( typeid( a[ 0 ] ) ) ) { int temp;

Re: Passing function(whose parameter would be dynamic and the type is unknown) as a parameter to another function.

2018-07-09 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 9 July 2018 at 05:54:27 UTC, vino.B wrote: In phase 2 we are transferring few more function to the existing D code, and these functions has variable number of parameter and different type eg: Function3(string, string, string), Function(string, int, string, int). Initially I

Re: Floating Point Literals: float (f) and real (L) suffix issue

2018-01-12 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 12 January 2018 at 12:57:37 UTC, kdevel wrote: On Friday, 12 January 2018 at 12:45:59 UTC, kdevel wrote: suffix.d ``` void main () { real r = 1.L; float f = 1.f; } ``` $ dmd suffix.d suffix.d(3): Error: no property 'L' for type 'int' suffix.d(4): Error: no property 'f' for

Re: Compile-time variadic equality

2018-03-09 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 9 March 2018 at 19:24:03 UTC, Nordlöw wrote: I'm looking for a function (that probably should be placed in std.meta) named something like `areEqual` that checks whether all it's arguments are equal or not. Is there such as function already in Phobos? My usage is static if

Re: Build an AliasSeq from memberFunction return types

2018-03-09 Thread Simen Kjærås via Digitalmars-d-learn
On Friday, 9 March 2018 at 17:47:46 UTC, Timoses wrote: To retrieve the member names the following (and filtering for only the functions) does the job: alias members = aliasSeqOf!([__traits(allMembers, S)]); This can be simplified to alias members = Alias!(__traits(allMembers, S));

Re: How do you call an eponymous template that has a secondary template arg?

2018-03-11 Thread Simen Kjærås via Digitalmars-d-learn
On Sunday, 11 March 2018 at 12:05:56 UTC, aliak wrote: * aliasOf!int!"string" // multiple ! arguments are not allowed * (aliasOf!int)!"string" // error c-style cast * aliasOf!int.aliasOf!"string" // template isAliasOf(alias a) does not have property 'isAliasOf Yeah, that's a little hole in

Re: Generic Property Implementation

2018-03-12 Thread Simen Kjærås via Digitalmars-d-learn
On Saturday, 10 March 2018 at 17:43:06 UTC, Simen Kjærås wrote: I'm not sure how fixable this is, but I am sure that there's plenty of benefit to being able to write code like this: struct S { int n, m; SomeType!(() => n + m) a; } over this: struct S { int n, m; auto a() {

Re: Generic Property Implementation

2018-03-12 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 12 March 2018 at 08:59:49 UTC, Alex wrote: An incomplete type is perfectly ok, so there should be no problem with a pointer of the same type inside a struct. If accidentally the pointer refers "this", then it must have been set after construction. As before construction the value of

Re: Generic Property Implementation

2018-03-12 Thread Simen Kjærås via Digitalmars-d-learn
On Monday, 12 March 2018 at 10:37:00 UTC, Alex wrote: Sure, you have. https://dlang.org/spec/struct.html#assign-overload Point #4. In this case, ref S opAssign(ref S rhs) { return this; } True. Can you fix these, too? struct S { S* ptr; this(int dummy) { ptr = }

Re: Slide - what does withPartial do?

2018-03-01 Thread Simen Kjærås via Digitalmars-d-learn
On Thursday, 1 March 2018 at 08:31:05 UTC, Piotr Mitana wrote: For some reason this is true: slide!(Yes.withPartial)([1, 2, 3, 4, 5], 3).array == [[1, 2, 3], [2, 3, 4], [3, 4, 5]] Shouldn't it rather return [[1], [1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 5], [4, 5], [5]], or at least [[1, 2, 3],

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