Re: I want Sublime 3 D auto import !
On Tuesday, 2 June 2020 at 20:08:09 UTC, bauss wrote:
What happens if you have the same symbol in multiple modules?
Ex. two libraries that implement symbols with same name.
First module will inserted.
Is there a way to be selective?
I want it too! :)
And what about keyboard shortcut?
A specially for you !
Sublime 3 / Preferences / Key bindings:
[
{ "keys": ["alt+a"], "command": "dlang_auto_import" },
]
Re: What's the best way to find out which exceptions may be thrown ?
On Wednesday, 27 May 2020 at 10:30:36 UTC, wjoe wrote: Could you please elaborate why checked exceptions are more annoying? Have like 3 functions : A calls B, B calls C . Imagine that now you need to throw a checked exception on C, that before wasn't necessary. You need to add the annoying "throws X" to A and B. And A and B could be on another module or on a different project. Perhaps, the guy that wrote B, was previsor, and putted "throws Exception" (or another generic Exception derived class) on B to avoid problems, but now you have loss the information about the specific Exception that C throws. So again, the compiler can't know what kind of exception could be throwed by A beyond of a generic "Exception" (or another generic exception class). Another workaround, could be wrapping the C throwed exception by a generic exception on B. I work daily with Java, and it's pretty annoying. That the IDE helps you auto putting the throws or suggesting a try/catch, helps. But we ended making some generic exceptions RuntimeExceptions to avoiding the noise and problems that could give checked exceptions.
Re: What's the best way to find out which exceptions may be thrown ?
On Tuesday, 2 June 2020 at 13:58:13 UTC, Bienlein wrote: On Wednesday, 27 May 2020 at 11:40:00 UTC, Mike Parker wrote: On Wednesday, 27 May 2020 at 10:30:36 UTC, wjoe wrote: [...] For me, it's because they require all functions that touch them to either try/catch or include an exception specification in its declaration. In my Java days, I ended up just doing what so many others do and adding `throws Exception` or `catch(Exception)` to avoid having to handle multiple exception types. Most of the time, I didn't care what specific sort of exception was thrown. Because of the problems with checked exceptions they were deliberately left out in C#. Here is an interview with Anders Hejlsberg, the creator of C# at MS, where he explains the reasons for this decision: https://www.artima.com/intv/handcuffs.html That was a good read. Thank you.
Re: Making alias of a struct field needs "this".
On Tuesday, 2 June 2020 at 20:38:40 UTC, Steven Schveighoffer
wrote:
On 6/2/20 10:51 AM, realhet wrote:
On Tuesday, 2 June 2020 at 13:10:55 UTC, Paul Backus wrote:
On Tuesday, 2 June 2020 at 09:28:01 UTC, realhet wrote:
A month ago I discovered that mixinDeclarations can be used for
types too:
mixin("int[", 2, "]") a = [5, 6];
Re: I want Sublime 3 D auto import !
On Monday, 1 June 2020 at 17:28:16 UTC, Johannes Loher wrote: On Monday, 1 June 2020 at 16:18:44 UTC, Виталий Фадеев wrote: [...] Demanding stuff usually doesn't work in this community. The usual answer is something like this: If you care about this, implement it yourself or pay somebody to do it. Depends on how you interpret it.
Re: How to make the compile time red color warning ?
On Wednesday, 3 June 2020 at 11:48:27 UTC, Виталий Фадеев wrote: Use case: I have class for Windows OS. I not implement class for Linux. I want message about it. When code compiled under Linux. You could use `static assert(false, "Message");` to make it an error.
Re: How to make the compile time red color warning ?
On Wednesday, 3 June 2020 at 11:56:26 UTC, MrSmith wrote: On Wednesday, 3 June 2020 at 11:48:27 UTC, Виталий Фадеев wrote: Use case: I have class for Windows OS. I not implement class for Linux. I want message about it. When code compiled under Linux. You could use `static assert(false, "Message");` to make it an error. That is true! I happy!
Fastest way to check using if identifier has already been defined, using static if or similar?
I'm generating some code. Some of the generated types need to be
overridden, so I define them manually at the top of the generated
file. Then I need to guard against redefining the identifier
(type/value/function) later on, in the generated code.
I'm currently using `static if (!__traits(compiles, thingy)) {`
to avoid redefining things twice.
Of course the proper fix is to not generate code for the
identifiers which are already manually defined, and not generate
any `static if`s at all, but until then, is there a faster way
than `static if (__traits(compiles, ...` to check if a
type/value/function has already been defined?
Re: Is there a list of things which are slow to compile?
On Wednesday, 3 June 2020 at 09:36:52 UTC, drathier wrote: Currently at ~1ksloc/s of d input without optimizing anything, which corresponds to 350ksloc/s if measuring by `-vcg-ast` output instead of d source input, while using the same time measurement from before, so the flag doesn't cost time. Sorry, that should read `44ksloc/s`, not `350ksloc/s`.
Re: What's the best way to find out which exceptions may be thrown ?
On Wednesday, 3 June 2020 at 07:19:45 UTC, Luis wrote: On Wednesday, 27 May 2020 at 10:30:36 UTC, wjoe wrote: Could you please elaborate why checked exceptions are more annoying? Have like 3 functions : A calls B, B calls C . [...] I work daily with Java, and it's pretty annoying. That the IDE helps you auto putting the throws or suggesting a try/catch, helps. But we ended making some generic exceptions RuntimeExceptions to avoiding the noise and problems that could give checked exceptions. I was thinking about IDE assistance, too, but after reading the interview with Anders Hejlsberg mentioning the ballooning problem - I can see how checked exceptions can get out of control.
How to make the compile time red color warning ?
Use case:
I have class for Windows OS.
I not implement class for Linux.
I want message about it. When code compiled under Linux.
Example:
version ( Windows )
{
public import ui.sys.windows.event.keyboardevent;
}
else
{
pragma( msg, "Unsupported OS" );
}
How to make red color message ?
pragma( msg, "Unsupported OS" );
Or may be call compiller warning_message() function ? Such exists
?
Thanks.
Re: Fastest way to check using if identifier has already been defined, using static if or similar?
On Wednesday, 3 June 2020 at 09:39:34 UTC, Basile B. wrote: You can use this template: enum Exists(alias T) = is(typeof(T)); I don't know if there's a faster way bu this technic is used, notatbly in phobos, to workaroud issues of double declaration in `static foreach` enum Exists(alias T) = is(typeof(T)); static assert(!Exists!bar); // undefined identifier bar -- Simen
Is there a list of things which are slow to compile?
I'm wondering if there's a place that lists things which are slower/faster to compile? DMD is pretty famed for compiling quickly, but I'm not seeing particularly high speed at all, and I want to fix that. Currently at ~1ksloc/s of d input without optimizing anything, which corresponds to 350ksloc/s if measuring by `-vcg-ast` output instead of d source input, while using the same time measurement from before, so the flag doesn't cost time. Here's my learnings so far: - CTFE is obviously unboundedly slow, since it runs arbitrary code - Template expansion is presumably O(n) in the size of the generated code, and the `-vcg-ast` flag helps a bit to see how much it's expanding. I'm not convinced it's the reason my code compiles slowly, though. - no idea how expensive static if's on traits are - std.regex compiles really slowly - CTFE always runs on all top-level value definitions (even if they contain things which cannot be executed at compile-time, and I hate this so so much) What other things are there? - identifier lengths? - comments? - aliases? - delegates? - Variants?
Re: Fastest way to check using if identifier has already been defined, using static if or similar?
On Wednesday, 3 June 2020 at 09:03:22 UTC, drathier wrote:
I'm generating some code. Some of the generated types need to
be overridden, so I define them manually at the top of the
generated file. Then I need to guard against redefining the
identifier (type/value/function) later on, in the generated
code.
I'm currently using `static if (!__traits(compiles, thingy)) {`
to avoid redefining things twice.
Of course the proper fix is to not generate code for the
identifiers which are already manually defined, and not
generate any `static if`s at all, but until then, is there a
faster way than `static if (__traits(compiles, ...` to check if
a type/value/function has already been defined?
You can use this template:
enum Exists(alias T) = is(typeof(T));
I don't know if there's a faster way bu this technic is used,
notatbly in phobos, to workaroud issues of double declaration in
`static foreach`
Re: Making alias of a struct field needs "this".
On Wednesday, 3 June 2020 at 10:11:59 UTC, realhet wrote:
On Tuesday, 2 June 2020 at 20:38:40 UTC, Steven Schveighoffer
wrote:
On 6/2/20 10:51 AM, realhet wrote:
On Tuesday, 2 June 2020 at 13:10:55 UTC, Paul Backus wrote:
On Tuesday, 2 June 2020 at 09:28:01 UTC, realhet wrote:
mixin("int[", 2, "]") a = mixin([5]) ~ 6;
That's insane :D
writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
C:\Users\vaida\Desktop\Associative Array Sorting> rdmd
testingGround.d
0. The quick brown fox jumps over the lazy dog
nonononoahahahaha Sphinx of black quartz, judge my vow.
2. # How vexingly quick daft zebras jump!
3. # The five boxing wizards jump quickly
4. # Maecenas consectetur risus a lacus sodales iaculis.
5. # Morbi sed tortor sollicitudin, pharetra massa egestas,
congue massa.
6. # Sed sit amet nisi at ligula ultrices posuere quis nec est.
7. # Mauris vel purus viverra, pellentesque elit id, consequat
felis.
Here you can see ". hahahahahahaha" and "nononono" and even
lineNumber is being merged into the same position. Why is this
happening and can this be simply resolved?
testingGround.d
import std.stdio;
import std.algorithm;
int lineNumber;
void main(){
File exampleFile = File("exampleText.txt");
lineNumber = 0;
foreach(line; exampleFile.byLine){
if (line == " Sphinx of black quartz, judge my vow.\u000D"){
writeln(lineNumber, ". hahahahahahaha", line,
"nononono");
} else {
writeln( lineNumber, ". ", line);
}
lineNumber++;
}
}
exampleText.txt
The quick brown fox jumps over the lazy dog
Sphinx of black quartz, judge my vow.
# How vexingly quick daft zebras jump!
# The five boxing wizards jump quickly
# Maecenas consectetur risus a lacus sodales iaculis.
# Morbi sed tortor sollicitudin, pharetra massa egestas, congue
massa.
# Sed sit amet nisi at ligula ultrices posuere quis nec est.
# Mauris vel purus viverra, pellentesque elit id, consequat
felis.
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On Wednesday, 3 June 2020 at 18:23:51 UTC, BoQsc wrote: Here you can see ". hahahahahahaha" and "nononono" and even lineNumber is being merged into the same position. Why is this happening and can this be simply resolved? Your string in "line" has a carriage return character at the end, which moves the cursor to the beginning of the display row. If you remove this trailing carriage return character (0x0D) it will display correctly. With the carriage return character in place, everything written to your terminal after the carriage return starts at the beginning of the row.
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On 6/3/20 2:23 PM, BoQsc wrote:
C:\Users\vaida\Desktop\Associative Array Sorting> rdmd testingGround.d
0. The quick brown fox jumps over the lazy dog
nonononoahahahaha Sphinx of black quartz, judge my vow.
2. # How vexingly quick daft zebras jump!
3. # The five boxing wizards jump quickly
4. # Maecenas consectetur risus a lacus sodales iaculis.
5. # Morbi sed tortor sollicitudin, pharetra massa egestas, congue massa.
6. # Sed sit amet nisi at ligula ultrices posuere quis nec est.
7. # Mauris vel purus viverra, pellentesque elit id, consequat felis.
Here you can see ". hahahahahahaha" and "nononono" and even lineNumber
is being merged into the same position. Why is this happening and can
this be simply resolved?
testingGround.d
import std.stdio;
import std.algorithm;
int lineNumber;
void main(){
File exampleFile = File("exampleText.txt");
lineNumber = 0;
foreach(line; exampleFile.byLine){
if (line == " Sphinx of black quartz, judge my vow.\u000D"){
writeln(lineNumber, ". hahahahahahaha", line, "nononono");
} else {
writeln( lineNumber, ". ", line);
}
lineNumber++;
}
}
exampleText.txt
The quick brown fox jumps over the lazy dog
Sphinx of black quartz, judge my vow.
# How vexingly quick daft zebras jump!
# The five boxing wizards jump quickly
# Maecenas consectetur risus a lacus sodales iaculis.
# Morbi sed tortor sollicitudin, pharetra massa egestas, congue massa.
# Sed sit amet nisi at ligula ultrices posuere quis nec est.
# Mauris vel purus viverra, pellentesque elit id, consequat felis.
\u000D is a carriage return, which means that the terminal moves the
insertion point to the front of the line, and writes "nononono" over the
original text there. (BTW, you can just do \r instead)
How do you fix it? I don't know what your requirements are. I don't know
what you are expecting.
-Steve
Re: Fastest way to check using if identifier has already been defined, using static if or similar?
On Wednesday, 3 June 2020 at 09:39:34 UTC, Basile B. wrote: On Wednesday, 3 June 2020 at 09:03:22 UTC, drathier wrote: [...] You can use this template: enum Exists(alias T) = is(typeof(T)); I don't know if there's a faster way bu this technic is used, notatbly in phobos, to workaroud issues of double declaration in `static foreach` Please don't promote templates like this as long as they are not really zero-cost. They don't add much to compile time granted. But Barnacles.
Re: Is there a list of things which are slow to compile?
On Wed, Jun 03, 2020 at 09:36:52AM +, drathier via Digitalmars-d-learn wrote: > I'm wondering if there's a place that lists things which are > slower/faster to compile? DMD is pretty famed for compiling quickly, > but I'm not seeing particularly high speed at all, and I want to fix > that. The two usual culprits are: - Recursive/chained templates - Excessive CTFE Note that while the current CTFE engine is slow, it's still reasonably fast for short computations. Just don't write nested loops or loops with a huge number of iterations inside your CTFE code, and you should be fine. And on that note, even running std.format with all of its complexity inside CTFE is reasonably fast, as long as you don't do it too often; so generally you won't see a problem here unless you have loop with too many iterations or too deeply-nested loops running in CTFE. Templates are generally reasonably OK, until you use too many recursive templates. Or if you chain too many of them together, like if you have excessively long UFCS chains with Phobos algorithms. Short chains are generally OK, but once they start getting long they will generate large symbols and large numbers of instantiations. Large symbols used to be a big problem, but ever since Rainer's fix they have generally been a lot tamer. But still, it's something to avoid unless you can't help it. Recursive templates are generally bad because they tend to produce a super-linear number of instantiations, which consume lots of compiler memory and also slow things down. Use too many of them, and things will quickly slow to a crawl. Worst is if you combine both deeply-nested templates and CTFE, like std.regex does. Similarly, std.format (which includes writefln & co) tends to add 1-2 seconds to compile time. Another is if you have an excessively long function body, IIRC there are some O(n^2) algorithms in the compiler w.r.t. the length of the function body. But I don't expect normal code to reach the point where this begins to matter; generally you won't run into this unless your code is *really* poorly written (like the entire application inside main()), or you're using excessive code generation (like the mixin of a huge procedurally generated string). Identifier lengths are generally no problem unless you're talking about 100KB-long identifiers, which used to be a problem until Rainer implemented backreferences in the mangling. But I don't expect normal code to generate symbols of this order of magnitude unless you're using excessively-long UFCS chains with nested templates. Identifier length generally doesn't even register on the radar unless they're ridiculously long, like tens or hundreds of KB long -- not something a human would type. What humans would consider a long identifier, like Java-style names that span 50 characters, are mere round-off error and probably don't even make a measurable difference. The problem really only begins to surface when you have 10,000 characters in your identifier or larger. Comments are not even a blip on the radar: lexing is the fastest part of the compilation process. Similarly, aliases are extremely cheap, it's not even on the radar. Delegates have only a runtime cost; they are similarly unnoticeably cheap during compilation. As are Variants, unless you're running Variants inside CTFE (which I don't think even works). T -- Why waste time reinventing the wheel, when you could be reinventing the engine? -- Damian Conway
Re: Fastest way to check using if identifier has already been defined, using static if or similar?
On Wednesday, 3 June 2020 at 13:24:17 UTC, Basile B. wrote:
This is because the template parameter must be resolved to a
valid symbol or type.
This version other version bypass the problem:
---
enum Exists(string s) = is(typeof(mixin(s)));
void main()
{
static if (!Exists!"foo")
int foo;
foo = 42;
}
---
Fails if the symbol in question is the name of a type.
struct Foo {}
enum Exists(string s) = is(typeof(mixin(s)));
static assert(Exists!"Foo"); // false
What you actually want is something like this:
enum Exists(string s) = __traits(compiles, { mixin("alias _ =
", s, ";"); });
Re: Fastest way to check using if identifier has already been defined, using static if or similar?
On Wednesday, 3 June 2020 at 10:24:44 UTC, Simen Kjærås wrote:
On Wednesday, 3 June 2020 at 09:39:34 UTC, Basile B. wrote:
You can use this template:
enum Exists(alias T) = is(typeof(T));
I don't know if there's a faster way bu this technic is used,
notatbly in phobos, to workaroud issues of double declaration
in `static foreach`
enum Exists(alias T) = is(typeof(T));
static assert(!Exists!bar); // undefined identifier bar
--
Simen
This is because the template parameter must be resolved to a
valid symbol or type.
This version other version bypass the problem:
---
enum Exists(string s) = is(typeof(mixin(s)));
void main()
{
static if (!Exists!"foo")
int foo;
foo = 42;
}
---
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
Removing the last element of the string got it resolved.
Might not be the best way and adding additional check for
carriage return before removing the element would be better, so
this is only initial proof.
Improved example with the above comments resolved.
testingGround.d
import std.stdio;
import std.algorithm;
int lineNumber;
void main(){
File exampleFile = File("exampleText.txt");
lineNumber = 0;
foreach(line; exampleFile.byLine){
if (line == " Sphinx of black quartz, judge my vow.\u000D"){
if (line[line.length -1] == '\u000D'){
line = line.remove(line.length - 1);
}
writeln(lineNumber, ". hahahahahahaha", line, "
nononono");
} else {
writeln( lineNumber, ". ", line[line.length -1]);
}
lineNumber++;
}
}
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On Wednesday, 3 June 2020 at 19:53:03 UTC, BoQsc wrote: Removing the last element of the string got it resolved. Might not be the best way and adding additional check for carriage return before removing the element would be better, so this is only initial proof. Improved example with the above comments resolved. That works, but consider using chomp() instead. https://dlang.org/phobos/std_string.html#.chomp
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On Wednesday, 3 June 2020 at 20:05:52 UTC, ttk wrote:
On Wednesday, 3 June 2020 at 19:53:03 UTC, BoQsc wrote:
Removing the last element of the string got it resolved.
Might not be the best way and adding additional check for
carriage return before removing the element would be better,
so this is only initial proof.
Improved example with the above comments resolved.
That works, but consider using chomp() instead.
https://dlang.org/phobos/std_string.html#.chomp
Chomp sounds kind of funny hahaha.
Who came up with these function names? Walter Bright?
Anyways, Chomp's way looks way more simple. Thanks.
import std.stdio;
import std.algorithm;
import std.string;
import std.uni : lineSep;
int lineNumber;
void main(){
File exampleFile = File("exampleText.txt");
lineNumber = 0;
foreach(line; exampleFile.byLine){
if (line == " Sphinx of black quartz, judge my vow.\u000D"){
writeln(lineNumber, ". hahahahahahaha", chomp(line, "\r"), "
nononono");
} else {
writeln( lineNumber, ". ", line);
}
lineNumber++;
}
}
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On Wed, Jun 03, 2020 at 08:43:43PM +, BoQsc via Digitalmars-d-learn wrote: > On Wednesday, 3 June 2020 at 20:05:52 UTC, ttk wrote: [...] > > That works, but consider using chomp() instead. > > > > https://dlang.org/phobos/std_string.html#.chomp > > Chomp sounds kind of funny hahaha. > Who came up with these function names? Walter Bright? > Anyways, Chomp's way looks way more simple. Thanks. Chomp comes from Perl. T -- For every argument for something, there is always an equal and opposite argument against it. Debates don't give answers, only wounded or inflated egos.
Re: writeln Function while reading a Text File is printing appending text "before text" and "after text" at the same position
On Wednesday, 3 June 2020 at 18:49:38 UTC, ttk wrote:
On Wednesday, 3 June 2020 at 18:23:51 UTC, BoQsc wrote:
Here you can see ". hahahahahahaha" and "nononono" and even
lineNumber is being merged into the same position. Why is this
happening and can this be simply resolved?
Your string in "line" has a carriage return character at the
end, which moves the cursor to the beginning of the display row.
If you remove this trailing carriage return character (0x0D) it
will display correctly.
With the carriage return character in place, everything written
to your terminal after the carriage return starts at the
beginning of the row.
It seems to be correct.
Removing the last element of the string got it resolved.
Might not be the best way and adding additional check for
carriage return before removing the element would be better, so
this is only initial proof.
Command Prompt Output
C:\Users\vaida\Desktop\Associative Array Sorting> rdmd
associativeArraySorting.d
0. The quick brown fox jumps over the lazy dog
1. hahahahahahaha Sphinx of black quartz, judge my vow.nononono
2. # How vexingly quick daft zebras jump!
3. # The five boxing wizards jump quickly
4. # Maecenas consectetur risus a lacus sodales iaculis.
5. # Morbi sed tortor sollicitudin, pharetra massa egestas,
congue massa.
6. # Sed sit amet nisi at ligula ultrices posuere quis nec est.
7. # Mauris vel purus viverra, pellentesque elit id, consequat
felis.
testingGround.d
import std.stdio;
import std.algorithm;
int lineNumber;
void main(){
File exampleFile = File("exampleText.txt");
lineNumber = 0;
foreach(line; exampleFile.byLine){
if (line == " Sphinx of black quartz, judge my vow.\u000D"){
writeln(lineNumber, ". hahahahahahaha",
line.remove(line.length - 1), " nononono");
} else {
writeln( lineNumber, ". ", line);
}
lineNumber++;
}
}
Re: I want Sublime 3 D auto import !
On Wednesday, 3 June 2020 at 11:54:57 UTC, Виталий Фадеев wrote:
On Tuesday, 2 June 2020 at 20:08:09 UTC, bauss wrote:
What happens if you have the same symbol in multiple modules?
Ex. two libraries that implement symbols with same name.
First module will inserted.
Is there a way to be selective?
I want it too! :)
And what about keyboard shortcut?
A specially for you !
Sublime 3 / Preferences / Key bindings:
[
{ "keys": ["alt+a"], "command": "dlang_auto_import" },
]
Thanks, that's great!
Re: What's the best way to find out which exceptions may be thrown ?
On Tuesday, 2 June 2020 at 13:58:13 UTC, Bienlein wrote: Because of the problems with checked exceptions they were deliberately left out in C#. Here is an interview with Anders Hejlsberg, the creator of C# at MS, where he explains the reasons for this decision: https://www.artima.com/intv/handcuffs.html This wouldn't seem to apply if checked exceptions were inferred by default, right? And the issues with Java generics don't apply to D, because our metaprogramming infers attributes anyways.
