Re: Building GUI projects with D
On Saturday, 20 October 2018 at 15:40:07 UTC, karis njiru wrote: Hi. Am a computer science student from Kenya and decided to use D for my class project on Principles of Programming Languages. Am having a lot of fun with D but have come across an issue. I have been using Visual D for the past 2 months for my coding but after a lot of research i found out that i cannot build GUI projects with visual D. So i took on Entice Designer which for the past week has been a nightmare for me to compile my code error being the system cannot find the path in the command prompt specified. I have installed DMD and DFL lots of times but there is still the same issue. Please help try GtkD or dlangui(UTF8 support is not complete, font rendering is a little bad.) or tkd
Re: assigment to null class object member compiled? is this a bug?
On Friday, 19 October 2018 at 09:08:32 UTC, Vijay Nayar wrote: Technically the code you have is syntactically correct. You are permitted to create a class variable without assigning it to a class object. (Assigning it to a class object would look like "A a = new A();") Which section of The D Programming Language book makes you think this would not compile? I have the book as well, but I'm not quite sure what part of the book you're referring to. the section 6.2, which is --- A a; a.x = 5; --- the book explained this should be refused to compile. thanks! -- dangbinghoo
Re: Can this recursive template type with named type parameters be simplified or improved?
On Sunday, 21 October 2018 at 21:23:35 UTC, aliak wrote: Hi, I'm playing around with a recursive template type that allows for named template parameters. The problem is that it requires a lot of repetition and becomes more error prone as the number of named arguments increase. So 1) Any ideas on how to make it less error prone? less repetition? a better way to do this? 2) Right now I can only have named optional parameters. Any ideas on how to make named required parameters (e.g. the first type parameter of Type). I don't know if this is at all helpful, but I spent an hour on it, so I'm going to share it: https://pastebin.com/cGZwc649 You can wrap it in a template if you want to retain the ability to pass arguments without names. Regards, Hakan
error initializing an immutable struct member with a function that takes a lazy param
Hi,
The code below fails with "Error: delegate
`onlineapp.A!int.A.__dgliteral2` cannot be struct members":
T f(T)(lazy T value) { return value; }
struct A(T) {
immutable a = f("hi");
}
void main() {
A!int i;
}
Removing the lazy keyword fixes the error. But I'm wondering if I
can keep lazy there. Is this a compile bug perhaps?
The actual use case where this is causing a problem is from this
function:
https://github.com/aliak00/ddash/blob/5c9f2923028c7c16b89b041b399f6fb1bc73639c/range/source/ddash/range/front.d#L25
and needing to use it in a declaration scope of a struct in this
kind of way:
struct A(string name) {
immutable firstPart = name.split("|").frontOr("");
}
Cheers,
-Ali
Can this recursive template type with named type parameters be simplified or improved?
Hi, I'm playing around with a recursive template type that allows
for named template parameters. The problem is that it requires a
lot of repetition and becomes more error prone as the number of
named arguments increase. So
1) Any ideas on how to make it less error prone? less repetition?
a better way to do this?
2) Right now I can only have named optional parameters. Any ideas
on how to make named required parameters (e.g. the first type
parameter of Type).
Here's an example of a type that has one required parameter and 4
optional named parameters:
private struct TypeImpl(
T,
string _arg0 = null,
int _arg1 = 0,
float _arg2 = 0,
alias _arg3 = null,
) {
alias Arg0 = _arg0;
alias Arg1 = _arg1;
alias Arg2 = _arg2;
alias Arg3 = _arg3;
public alias arg0(string value) = TypeImpl!(T, value, Arg1,
Arg2, Arg3);
public alias arg1(int value) = TypeImpl!(T, Arg0, value,
Arg2, Arg3);
public alias arg2(float value) = TypeImpl!(T, Arg0, Arg1,
value, Arg3);
public static template arg3(alias value) {
alias arg3 = TypeImpl!(T, Arg0, Arg1, Arg2, value);
}
}
public template Type(T) {
alias Type = TypeImpl!(T);
}
void main() {
void fun() {}
alias U = Type!int
.arg0!"string"
.arg1!3
.arg3!fun;
pragma(msg, U);
}
Cheers,
- Ali
Re: Which Docker to use?
On Sunday, 21 October 2018 at 18:11:37 UTC, Jacob Carlborg wrote: On 2018-10-18 01:15, Jon Degenhardt wrote: I need to use docker to build static linked Linux executables. My reason is specific, may be different than the OP's. I'm using Travis-CI to build executables. Travis-CI uses Ubuntu 14.04, but static linking fails on 14.04. The standard C library from Ubuntu 16.04 or later is needed. There may be other/better ways to do this, I don't know. That's interesting. I've built static binaries for DStep using LDC on Travis CI without any problems. My comment painted too broad a brush. I had forgotten how specific the issue I saw was. Apologies for the confusion. The issue that caused me to go to Ubuntu 16.04 had to do with uncaught exceptions when using LTO with the gold linker and LDC 1.5. Problem occurred with 14.04, but not 16.04. I should go back and retest on Ubuntu 14.04 with a more recent LDC, it may well have been corrected. The issue thread is here: https://github.com/ldc-developers/ldc/issues/2390.
Re: Can opApply be made @nogc?
DIP 1000 says: Delegates currently defensively allocate closures with the GC. Few actually escape, and with scope only those that actually escape need to have the closures allocated. https://github.com/dlang/DIPs/blob/master/DIPs/DIP1000.md#benefits
Re: Which Docker to use?
On 2018-10-18 01:15, Jon Degenhardt wrote: I need to use docker to build static linked Linux executables. My reason is specific, may be different than the OP's. I'm using Travis-CI to build executables. Travis-CI uses Ubuntu 14.04, but static linking fails on 14.04. The standard C library from Ubuntu 16.04 or later is needed. There may be other/better ways to do this, I don't know. That's interesting. I've built static binaries for DStep using LDC on Travis CI without any problems. -- /Jacob Carlborg
Re: Why is dynamic array length required here?
Stanislav, Ali, Mike -- Thank you all for your thoughtful and helpful replies to my queries. Apologies that it has taken this long to reply to you. I still haven't been able to find time to go through all of the code examples provided but hope to do so later this week. If I have additional questions, I know where to go! Thanks again!
Re: Building GUI projects with D
On 2018-10-20 17:40, karis njiru wrote: Hi. Am a computer science student from Kenya and decided to use D for my class project on Principles of Programming Languages. Am having a lot of fun with D but have come across an issue. I have been using Visual D for the past 2 months for my coding but after a lot of research i found out that i cannot build GUI projects with visual D. So i took on Entice Designer which for the past week has been a nightmare for me to compile my code error being the system cannot find the path in the command prompt specified. I have installed DMD and DFL lots of times but there is still the same issue. Please help Give DWT [1] a try. It's a port of the Eclipse SWT library from Java to D. It's completely written in D and uses the native drawing operations of the OS giving the applications a native look and feel. [1] http://github.com/d-widget-toolkit/dwt -- /Jacob Carlborg
