Re: javascript or typescript
On Monday, 5 November 2018 at 02:51:19 UTC, Fred wrote: i'd like to give d a try. Why do you need to convert it to javascript? D can serve up web stuff by itself too.
Re: Putting dmd error through grep for dustmite
On Monday, 5 November 2018 at 03:01:43 UTC, Dennis wrote: Does anybody know what the problem is? I'm using Windows 10 and Git Bash. Sounds like the problem comes from the differences in shell syntax (quoting style) for the two shells here. When you run the command in Git Bash, the syntax used is Bash's. However, Dustmite will call shellExecute, which will pass the command to cmd.exe. cmd.exe will interpret \` verbatim (i.e. as \`), so, try not quoting the ` characters (or just replace them with . if you want the command to work in both shells).
Putting dmd error through grep for dustmite
I am debugging a case where operator overloading seems to break when I define the opBinary templates in a mixin template. On my own simple test-case it worked fine, so I'm trying to reduce my current code with dustmite. The file tree is simply: myproject/ q16.d And the command I run is: ``` $ dustmite myproject 'dmd -color=off -unittest q16.d 2>&1 | grep "Error: template \`util.q16.Q16_16.opBinary\` does not match any template declaration"' --no-redirect ``` It complains that the 'Initial test fails'. However, when I 'cd myproject' and run the command myself I get: ``` q16.d(167): Error: template `util.q16.Q16_16.opBinary` does not match any template declaration $ echo $? 0 ``` So for me it works. When I reduce the grep string to "util.q16.Q16_16.opBinary" it works on dustmite too, but it reduces too much since that condition is not precise enough. It seems that the backticks of `util.q16.Q16_16.opBinary` are the problem. I noticed that the back-ticks aren't there when the output is colorised, but adding -color=off didn't seem to make a difference. Removing them from the search or double-escaping them (like \\\`) also don't work. Does anybody know what the problem is? I'm using Windows 10 and Git Bash.
javascript or typescript
hi, my javascript skill is bad. but i want to host some nodejs app i am aware that there is converter to js like dtojs. but it is out of date. i'd like to give d a try. is there any other converter available. a decent one.
Re: Accessing LPARAM param from SendMessage acts weird.
On Sunday, 4 November 2018 at 19:06:22 UTC, Mark Moorhen wrote:
Another Windows challenge:
I'm trying to get the title of the active window even if it is
from an external application. This is what I've come up with so
far:
import std.stdio;
import core.sys.windows.windows;
extern (Windows)
void main()
{
HWND foreground = GetForegroundWindow();
const(wchar) title;
int length = SendMessage(foreground, WM_GETTEXTLENGTH, 0, 0);
SendMessage(foreground, WM_GETTEXT, length,
LPARAM(title)); //LPARAM is a Long Pointer
writeln(length);
writeln(title);
}
Outputs :
27
´┐┐
So the lengt of the foreground windows title should be 27 chars
long, but the title is only 3 chars (and kinda funny ones too:-(
Anyone ideas?
You need to allocate some memory to receive the string from
WM_GETTEXT.
auto length = SendMessage(foreground, WM_GETTEXTLENGTH, 0, 0);
auto buffer = new wchar[length + 1]; // +1 for the trailing
null character
SendMessage(foreground, WM_GETTEXT, buffer.length,
cast(LPARAM)buffer.ptr);
auto title = cast(wstring)buffer[0 .. length];
writeln(title);
Re: d word counting approach performs well but has higher mem usage
On Saturday, 3 November 2018 at 14:26:02 UTC, dwdv wrote: Hi there, the task is simple: count word occurrences from stdin (around 150mb in this case) and print sorted results to stdout in a somewhat idiomatic fashion. Now, d is quite elegant while maintaining high performance compared to both c and c++, but I, as a complete beginner, can't identify where the 10x memory usage (~300mb, see results below) is coming from. Unicode overhead? Internal buffer? Is something slurping the whole file? Assoc array allocations? Couldn't find huge allocs with dmd -vgc and -profile=gc either. What did I do wrong? Not exactly the same problem, but there is relevant discussion in the blog post I wrote a while ago: https://dlang.org/blog/2017/05/24/faster-command-line-tools-in-d/ See in particular the section on Associate Array lookup optimization. This takes advantage of the fact that it's only necessary to create the immutable string the first time a key is entered into the hash. Subsequent occurrences do not need to take this step. As creating allocates new memory, even if only used temporarily, this is a meaningful savings. There have been additional APIs added to the AA interface since I wrote the blog post, I believe it is now possible to accomplish the same thing with more succinct code. Other optimization possibilities: * Avoid auto-decode: Not sure if your code is hitting this, but if so it's a significant performance hit. Unfortunately, it's not always obvious when this is happening. The task your are performing doesn't need auto-decode because it is splitting on single-byte utf-8 char boundaries (newline and space). * LTO on druntime/phobos: This is easy and will have a material speedup. Simply add '-defaultlib=phobos2-ldc-lto,druntime-ldc-lto' to the 'ldc2' build line, after the '-flto=full' entry. This will be a win because it will enable a number of optimizations in the internal loop. * Reading the whole file vs line by line - 'byLine' is really fast. It's also nice and general, as it allows reading arbitrary size files or standard input without changes to the code. However, it's not as fast as reading the file in a single shot. * std.algorithm.joiner - Has improved dramatically, but is still slower than a foreach loop. See: https://github.com/dlang/phobos/pull/6492 --Jon
Accessing LPARAM param from SendMessage acts weird.
Another Windows challenge:
I'm trying to get the title of the active window even if it is
from an external application. This is what I've come up with so
far:
import std.stdio;
import core.sys.windows.windows;
extern (Windows)
void main()
{
HWND foreground = GetForegroundWindow();
const(wchar) title;
int length = SendMessage(foreground, WM_GETTEXTLENGTH, 0, 0);
SendMessage(foreground, WM_GETTEXT, length,
LPARAM(title)); //LPARAM is a Long Pointer
writeln(length);
writeln(title);
}
Outputs :
27
´┐┐
So the lengt of the foreground windows title should be 27 chars
long, but the title is only 3 chars (and kinda funny ones too:-(
Anyone ideas?
Re: d word counting approach performs well but has higher mem usage
Assoc array allocations? Yup. AAs do keep their memory around (supposedly for reuse). [...] Why it consumes so much is a question to the implementation. [...] I guess built-in AAs just love to hoard. What a darn shame. This way I'm missing out on all those slick internet benchmark points. :) Guess I have to find a workaround then, since it's swapping memory like crazy on larger real-world inputs on my fairly low-end machine. What did I do wrong? Well, you didn't actually put the keys into the AA ;) I'm guessing you didn't look closely at the output, otherwise you would've noticed that something was wrong. [...] ``` Error: associative arrays can only be assigned values with immutable keys, not char[] ``` [...] But when you iterate later, pretty much every key is in fact a reference to some older memory, which is still somewhere on the GC heap; you don't get a segfault, but neither do you get correct "words". You are absolutely right, I dismissed the aforementioned error without a second thought as soon as the compiler stopped complaining by throwing a const declaration at it. Oh well, should have read the assoc array spec page more thoroughly since it contains this very snippet here: ``` auto word = line[wordStart .. wordEnd]; ++dictionary[word.idup]; // increment count for word ``` And yes, using more irregular log files as input instead of the concatenated uniform dict reveals quite a bit of nonsense that is being printed to stdout. Thank you, Stanislav, for taking the time to explain all this.
Re: Overriding behaviour of `is` for small-sized-optimized strings
On Sunday, 4 November 2018 at 13:19:45 UTC, Jacob Carlborg wrote: You cannot overload the the "is" operator. Use "==" if you want to overload it. Ok, thanks.
Re: Overriding behaviour of `is` for small-sized-optimized strings
On 2018-11-04 12:49, Per Nordlöw wrote: At https://github.com/nordlow/phobos-next/blob/master/src/sso_string.d I would like to override the behaviour of `x is y` for `x` and `y` being instances of `SSOString`. to always mean `x[] is y[]` How do I do this? Is this the recommended behaviour in D for small-size-optimized strings? You cannot overload the the "is" operator. Use "==" if you want to overload it. -- /Jacob Carlborg
Overriding behaviour of `is` for small-sized-optimized strings
At https://github.com/nordlow/phobos-next/blob/master/src/sso_string.d I would like to override the behaviour of `x is y` for `x` and `y` being instances of `SSOString`. to always mean `x[] is y[]` How do I do this? Is this the recommended behaviour in D for small-size-optimized strings?
Re: Need help with calling a list of functions
On Sunday, 4 November 2018 at 01:17:01 UTC, Luigi wrote: I need to call a function that can create a function from an array of functions and calls them in reverse order. I am learning D any help would be That sounds a lot like std.functional.compose
