Re: countUntil with negated pre-defined predicate?
On Saturday, 2 May 2020 at 18:23:30 UTC, Robert M. Münch wrote:
Or is there an even better way to search for all "drawable
unicode characters"?
This depends on what you classify as drawable, and what you
consider to be a character (the joys of Unicode), and why you
want to search for them anyway.
One way (I haven't verified this) could be to check if any of the
code-points within a grapheme are graphical[1], and not
white-space (and are not any other code-point you consider
non-drawable).
Which could look like so:
import std.algorithm;
import std.range;
import std.uni;
size_t drawableCharacterCount (CodePoints) (auto ref CodePoints
codePoints)
if (isInputRange!CodePoints && is(ElementType!CodePoints :
dchar))
{
bool isDrawableCodePoint (dchar c)
{
return c.isGraphical() && !c.isWhite();
}
return codePoints.byGrapheme().count!(
g => g[].any!isDrawableCodePoint
);
}
[1]:
https://www.unicode.org/versions/Unicode13.0.0/ch02.pdf#G286941
---
The source-code in this reply is available for use under the
terms of Creative Commons CC0 1.0 Universal.
Re: How can I open a Binary EXE with Hexadecimal?
On Saturday, 2 May 2020 at 21:05:32 UTC, Baby Beaker wrote: save as "rb" again. This will not work. To be able to write to a binary file, you will have to use "wb".
Re: How can I open a Binary EXE with Hexadecimal?
On Saturday, 2 May 2020 at 21:05:32 UTC, Baby Beaker wrote:
I need open a Binary EXE, it can be using "rb" mode and convert
it to Hexadecimal for me make some changes and save as "rb"
again. How can I make it? Thank you.
You dont convert binary data to hexadecimal. You display it as
hexadecimal. If you want to print file contents to console in hex
do something like this.
import std.stdio;
import std.algorithm;
auto fd = File("filename", "r"); //open file for reading
ubyte[] data; //a GC allocated buffer for data
fd.rawRead(data); //read the data
data[0..50].each!(n => stdout.writef("%X ",n));
/*take 50 elements from array and for each of them call lambda
that converts ubyte to string in hex format and prints to the
stdout*/
if you want to assign to this data you can do something like this
data[0] = Oxff;
And then write to file
How can I open a Binary EXE with Hexadecimal?
I need open a Binary EXE, it can be using "rb" mode and convert it to Hexadecimal for me make some changes and save as "rb" again. How can I make it? Thank you.
Re: Idomatic way to guarantee to run destructor?
On 5/2/20 3:08 PM, Robert M. Münch wrote: On 2020-05-02 18:18:44 +, Steven Schveighoffer said: On 5/2/20 4:44 AM, Robert M. Münch wrote: How would that help, because the class instance is now unusable anyway. So I have it around like a zombie and others might think: "Hey you look normal, let's get in contact" and then you are doomed... The difference is that if you use it, you get an error and a crash. If you clean up the memory, that memory could be reallocated to something else with a completely different type, and now you have memory corruption. I didn't thought about the "memory is re-used" case here... And how is the instance made unusable so that a crash happens (which I prefer too!)? Does .destroy zero the memory? Just curious how the crash situation is detected. destroy sets all the values to the .init value. And it nulls the vtable pointer. So any virtual calls will crash with a segfault. non-virtual calls won't crash immediately, but generally there are few class calls that have all final calls. And even if they do go through, the .init value should be harmless in terms of memory safety. For reference, destroy calls this function on class instances (Same as GC cleanup) where p is really the class reference: https://github.com/dlang/druntime/blob/999367be8fa5d13a718d951d67c3d580ca13aef1/src/rt/lifetime.d#L1414 You can see in the finally clause, the vptr is set to null. -Steve
Re: Idomatic way to guarantee to run destructor?
On 2020-05-02 18:18:44 +, Steven Schveighoffer said: On 5/2/20 4:44 AM, Robert M. Münch wrote: How would that help, because the class instance is now unusable anyway. So I have it around like a zombie and others might think: "Hey you look normal, let's get in contact" and then you are doomed... The difference is that if you use it, you get an error and a crash. If you clean up the memory, that memory could be reallocated to something else with a completely different type, and now you have memory corruption. I didn't thought about the "memory is re-used" case here... And how is the instance made unusable so that a crash happens (which I prefer too!)? Does .destroy zero the memory? Just curious how the crash situation is detected. -- Robert M. Münch http://www.saphirion.com smarter | better | faster
Re: countUntil with negated pre-defined predicate?
On Saturday, 2 May 2020 at 18:23:30 UTC, Robert M. Münch wrote:
This works:
countUntil!(std.uni.isWhite)("hello world"))
How can I switch this to (not working);
countUntil!(!std.uni.isWhite)("hello world"))
without having to write my own predicate?
Or is there an even better way to search for all "drawable
unicode characters"?
std.functional.not can do this:
https://dlang.org/phobos/std_functional.html#not
Re: countUntil with negated pre-defined predicate?
On 5/2/20 2:23 PM, Robert M. Münch wrote:
This works:
countUntil!(std.uni.isWhite)("hello world"))
How can I switch this to (not working);
countUntil!(!std.uni.isWhite)("hello world"))
without having to write my own predicate?
Or is there an even better way to search for all "drawable unicode
characters"?
Write your own predicate, it's not much different:
countUntil!(c => !std.uni.isWhite(c))("hello world")
-Steve
countUntil with negated pre-defined predicate?
This works:
countUntil!(std.uni.isWhite)("hello world"))
How can I switch this to (not working);
countUntil!(!std.uni.isWhite)("hello world"))
without having to write my own predicate?
Or is there an even better way to search for all "drawable unicode characters"?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
Re: Idomatic way to guarantee to run destructor?
On 5/2/20 4:44 AM, Robert M. Münch wrote: On 2020-04-30 17:45:24 +, Steven Schveighoffer said: You can use scope instead of auto, and it will then allocate the class on the stack, and destroy it as Ben Jones said. There is danger there, however, as it's very easy to store a class reference elsewhere, and then you have a dangling pointer. Ok. Can't this be combined with some "don't let the refrence escape my function" feature of D? I don't know. perhaps dip1000 helps here. A safer thing to do is: auto X = new MyClass(); scope(exit) destroy(X); This runs the destructor and makes the class instance unusable, but does not free the memory (so any remaining references, if used, will not corrupt memory). How would that help, because the class instance is now unusable anyway. So I have it around like a zombie and others might think: "Hey you look normal, let's get in contact" and then you are doomed... The difference is that if you use it, you get an error and a crash. If you clean up the memory, that memory could be reallocated to something else with a completely different type, and now you have memory corruption. -Steve
Re: sort a string
On Friday, 1 May 2020 at 19:25:43 UTC, Steven Schveighoffer wrote: Nice! Yeah, I was sloppy in my newsgroup coding, sorry. One minor nit here, the to!(dchar[])(word.dup), the dup is not necessary, you are going to end up allocating a temporary array and throwing it away. Just do word.to!(dchar[]). `to` takes care of all the formalities. -Steve THANK YOU for all the great hints and explanations here and in general in this NG, Steve! No blaming for the "sloopy code" at all. I should have seen the missing [] by myself, but... _AND_ btw. your hint with the "release" was key to the discussion / solution anyhow! :)
Re: a function like writeln that returns a string rather than writes to a file
On Saturday, 2 May 2020 at 10:36:47 UTC, Ali Çehreli wrote:
On 5/1/20 7:40 PM, dan wrote:> On Saturday, 2 May 2020 at
02:29:43 UTC, H. S. Teoh wrote:
>> On Sat, May 02, 2020 at 02:22:42AM +, dan via
Digitalmars-d-learn
>> wrote:
>>> I'm looking for a function something like writeln or write,
but
>>> instead of writing to stdout, it writes to a string and
returns the
>>> string.
>> [...]
>>
>> import std.format : format;
>> string str = format("%s %s %s", obj1, obj2, obj3);
>>
>>
>> T
>
> Thanks HS!
>
> That looks like a good move, if format will do the string
conversion for
> me.
>
> But one thing that would be troublesome is that i would have
to make
> sure to count up the %s so that they match the number of
arguments. I
> would like to do without that, just like writeln does.
If you can live with a mildly awkward way of passing it,
format() can take the format string at compile time as well:
string str = format!"%s %s %s"(obj1, obj2, obj3);
You get a compilation error if format specifications don't
match the arguments. (There are bug reports about that check
but it mostly works great.)
Ali
Thanks Ali.
That's also a good point, and would remove one of my qualms about
all of the %s reps.
So if for any reason i cannot use the text function (or if i want
to double check on the types of the objects) this would be a good
thing to use.
dan
Re: Hided Subprocess in Dlang
On Saturday, 2 May 2020 at 15:42:20 UTC, Adam D. Ruppe wrote:
On Saturday, 2 May 2020 at 15:37:09 UTC, Baby Beaker wrote:
Error: none of the overloads of `spawnProcess` are callable
using argument types `(string, File, File, File, Config)`,
candidates are:
The example is prolly out of date
try
spawnProcess(program, null, Config.suppressConsole)
Working very well! Thank you!
A simple example using spawnShell just open notepad.exe without
console.
spawnShell("notepad.exe", null, Config.suppressConsole);
Re: Hided Subprocess in Dlang
On Saturday, 2 May 2020 at 15:37:09 UTC, Baby Beaker wrote: Error: none of the overloads of `spawnProcess` are callable using argument types `(string, File, File, File, Config)`, candidates are: The example is prolly out of date try spawnProcess(program, null, Config.suppressConsole)
Re: Hided Subprocess in Dlang
On Saturday, 2 May 2020 at 15:20:36 UTC, Adam D. Ruppe wrote: On Saturday, 2 May 2020 at 14:06:55 UTC, Baby Beaker wrote: open the command prompt console running this other process. when calling the functions pass Config.suppressConsole to it. like in the doc example here http://dpldocs.info/experimental-docs/std.process.Config.html#suppressConsole Error: none of the overloads of `spawnProcess` are callable using argument types `(string, File, File, File, Config)`, candidates are:
Re: Hided Subprocess in Dlang
On Saturday, 2 May 2020 at 14:06:55 UTC, Baby Beaker wrote: open the command prompt console running this other process. when calling the functions pass Config.suppressConsole to it. like in the doc example here http://dpldocs.info/experimental-docs/std.process.Config.html#suppressConsole
Hided Subprocess in Dlang
I am creating a program in Dlang with graphical user interface. I want this program to run a hidden sub-process in the background. But when I click the program to run this process using spamShell or executeShell, open the command prompt console running this other process. Please help me.
Re: a function like writeln that returns a string rather than writes to a file
On 5/1/20 7:40 PM, dan wrote:> On Saturday, 2 May 2020 at 02:29:43 UTC,
H. S. Teoh wrote:
>> On Sat, May 02, 2020 at 02:22:42AM +, dan via Digitalmars-d-learn
>> wrote:
>>> I'm looking for a function something like writeln or write, but
>>> instead of writing to stdout, it writes to a string and returns the
>>> string.
>> [...]
>>
>> import std.format : format;
>> string str = format("%s %s %s", obj1, obj2, obj3);
>>
>>
>> T
>
> Thanks HS!
>
> That looks like a good move, if format will do the string conversion for
> me.
>
> But one thing that would be troublesome is that i would have to make
> sure to count up the %s so that they match the number of arguments. I
> would like to do without that, just like writeln does.
If you can live with a mildly awkward way of passing it, format() can
take the format string at compile time as well:
string str = format!"%s %s %s"(obj1, obj2, obj3);
You get a compilation error if format specifications don't match the
arguments. (There are bug reports about that check but it mostly works
great.)
Ali
Re: Idomatic way to guarantee to run destructor?
On 2020-04-30 17:45:24 +, Steven Schveighoffer said: No, auto is declaring that there's about to be a variable here. In actuality, auto does nothing in the first case, it just means local variable. But without the type name, the type is inferred (i.e. your second example). This does not do any automatic destruction of your class, it's still left to the GC. Ok, that was my understand too. As said, I found some older posts and was a bit confused... You can use scope instead of auto, and it will then allocate the class on the stack, and destroy it as Ben Jones said. There is danger there, however, as it's very easy to store a class reference elsewhere, and then you have a dangling pointer. Ok. Can't this be combined with some "don't let the refrence escape my function" feature of D? A safer thing to do is: auto X = new MyClass(); scope(exit) destroy(X); This runs the destructor and makes the class instance unusable, but does not free the memory (so any remaining references, if used, will not corrupt memory). How would that help, because the class instance is now unusable anyway. So I have it around like a zombie and others might think: "Hey you look normal, let's get in contact" and then you are doomed... If your concern is guaranteeing destructors are run, that's what I would pick. If in addition you want guaranteed memory cleanup, then use scope (and be careful). Ok, thanks. -- Robert M. Münch http://www.saphirion.com smarter | better | faster
Re: Idomatic way to guarantee to run destructor?
On 2020-04-30 17:04:43 +, Ben Jones said: I think you want to use scope rather than auto which will put the class on the stack and call its destructor: https://dlang.org/spec/attribute.html#scope Yes, thanks. -- Robert M. Münch http://www.saphirion.com smarter | better | faster
