enum tuple subscript as template parameter => Tuple(A(0)) must be an array or pointer type, not Tuple!(A)
Hi,
I'm having a bit of an issue here and the compiler is not really
explicit.
Here's the code:
import std.typecons;
struct A { int i; }
void main()
{
enum t = tuple(A());
f!(t[0].i); //Error: Tuple(A(0)) must be an array or pointer
type, not Tuple!(A)
f!(([0]).i) //Ok
enum v = t[0];
f!(v.i); //Error: template instance f!(i) does not match
template declaration f(int T)()
f!((v.i)); //Ok
}
void f(int T)() {}
Re: Looking for an equivalent to C++ std::getline in D
On Sunday, 7 May 2017 at 13:16:16 UTC, bachmeier wrote: On Sunday, 7 May 2017 at 10:33:25 UTC, k-five wrote: Although I found D for being more better, nicer,and fun than C++ is, but there is a few questions on Stack-Over-Flow, videos on Youtube, and some other forums in my country. So, why D is not popular? If by popular you mean C++ or Java levels of usage, that's a pretty high standard. While D is not among the most used languages in large enterprises, it is definitely not an obscure language. For example, just a few days ago I was reading about the new Scala Native project. Among the motivations for that project is "Scala Native provides an interop layer that makes it easy to interact with foreign native code. This includes C and other languages that can expose APIs via C ABI (e.g. C++, D, Rust etc.)" [0] You have to be careful about using stackoverflow as a measure of language popularity. Most activity takes place on this mailing list, which was going long before stackoverflow, and there was little motivation to move there (Google searches will bring you here). One of the few quantitative measures (and even that's of limited use) is DMD downloads from this site. Most recently they have been at about 50,000 per month.[1] [0] http://www.scala-native.org/en/latest/user/interop.html [1] http://erdani.com/d/downloads.daily.png If you look on TIOBE [1] newest stats, D does not look so bad after all. It's ranked 23 with a 1.38% share. The so fashionable and noisy Rust is only ranked 40 with 0.41% of share and classics like COBOL, FORTRAN, Lisp, Scala, Ada, bash are all behind. So it's not yet in the top 20 but I think that it will continue growing, slowly and steadily. [1]: https://www.tiobe.com/tiobe-index/
Re: Looking for an equivalent to C++ std::getline in D
On Sunday, 7 May 2017 at 12:29:20 UTC, Stanislav Blinov wrote: On Sunday, 7 May 2017 at 10:33:25 UTC, k-five wrote: [...] Because everyone is asking this question instead of actually doing something about it :) To be fair, D has a good amount of usage even today, it's just not being screamed about ecstatically. [...] Today is the last day of the D Conference 2017, last three days it was livestreaming. There were quite a bit of talks on current developments and future progress. The videos from those streams should appear at https://www.youtube.com/user/sociomantic/videos hopefully early next week. They also have previous conference videos out there. Some of them have started to appear already 3 hours ago.
Re: File Input
On Sunday, 7 May 2017 at 15:59:25 UTC, JV wrote:
On Sunday, 7 May 2017 at 15:16:58 UTC, k-five wrote:
On Sunday, 7 May 2017 at 13:57:47 UTC, JV wrote:
I'm kinda getting it but how do i write the stored user
input(string) varaible into a .txt??im getting confused since D
has so many read and write
->sample below
string num;
auto attendance= File("studAttendance.txt","a+");
writeln("Add Student Attendance");
readf("%s ",);//im not sure if this is correct but
assuming it works
//how do i write what is stored in
num in the studAttendance.txt
//file??
attendance.close();
--
You have the right for confusing :) there is many read and write
names. But I assumed you are familiar with [Type] and [Object]
concept.
in:
auto output_file_stream = File( "file.txt", "w" );
auto = File == A type
File( "file.txt", "w" ); == Constructor
So this type has its own property, like read for "r" mode and
write for "w" mode.
So you should use output_file_stream.write(), not readf or so on.
Still I am very new in D, but this is the same concept in other
language like C++
in C++:
#include
#include
#include
int main(int argc, char **argv)
{
std::ofstream ofs( "file.txt" );
std::string line = "This is the first line";
// write is a method in class ofstream
ofs.write( &*line.begin(), line.length() );
ofs.close();
}
Re: File Input
On Sunday, 7 May 2017 at 15:16:58 UTC, k-five wrote:
On Sunday, 7 May 2017 at 13:57:47 UTC, JV wrote:
Hi guys
I'd like to know how to get an input from the user to be
stored in a .txt file using import std.file and is it possible
to directly write in a .txt file without using a variable to
store the user input?
Thanks for the answer in advance my mind is kinda jumbled
about this since im new to this language.
First of all see here:
https://dlang.org/phobos/std_stdio.html#.File
also:
import std.stdio; // for File
void main(){
// an output file with name file.txt
// w for writing
auto ofs = File( "file.txt", "w" );
// output file stream:
ofs.write( stdin.readln() ); // get a line from console
ofs.close();
}
cat file.txt:
This is the first line.
and for std.file:
https://dlang.org/phobos/std_file.html
I'm kinda getting it but how do i write the stored user
input(string) varaible into a .txt??im getting confused since D
has so many read and write
->sample below
string num;
auto attendance= File("studAttendance.txt","a+");
writeln("Add Student Attendance");
readf("%s ",);//im not sure if this is correct but
assuming it works
//how do i write what is stored in num
in the studAttendance.txt
//file??
attendance.close();
Re: File Input
On Sunday, 7 May 2017 at 13:57:47 UTC, JV wrote: Hi guys I'd like to know how to get an input from the user to be stored in a .txt file using import std.file and is it possible to directly write in a .txt file without using a variable to store the user input? Thanks for the answer in advance my mind is kinda jumbled about this since im new to this language. http://nomad.so/2015/09/working-with-files-in-the-d-programming-language/
Deprecation: foo.bar is not visible from module traits
I'm reworking my code to use UDAs, and I'm running into a wall of
text of deprecation warnings when compiling.
import std.traits;
private:
struct SomeUDA {}
@SomeUDA
void foo() {}
@SomeUDA
void bar() {}
@SomeUDA
void etc() {}
public:
void main()
{
mixin("static import thisModule = " ~ __MODULE__ ~ ";");
foreach (symbol; getSymbolsByUDA!(thisModule, SomeUDA))
{
static if (isSomeFunction!symbol)
{
pragma(msg, symbol.stringof);
}
}
}
See https://wandbox.org/permlink/6Z01koyGGRxjsNWG for the output
it gives. In the real code it's unmanageably many lines.
Is there any way to get rid of these warnings except by making
everything public? Ideally I wouldn't want to copy the source of
getSymbolsByUDA into each file doing this either.
Re: File Input
On Sunday, 7 May 2017 at 13:57:47 UTC, JV wrote:
Hi guys
I'd like to know how to get an input from the user to be stored
in a .txt file using import std.file and is it possible to
directly write in a .txt file without using a variable to store
the user input?
Thanks for the answer in advance my mind is kinda jumbled about
this since im new to this language.
First of all see here:
https://dlang.org/phobos/std_stdio.html#.File
also:
import std.stdio; // for File
void main(){
// an output file with name file.txt
// w for writing
auto ofs = File( "file.txt", "w" );
// output file stream:
ofs.write( stdin.readln() ); // get a line from console
ofs.close();
}
cat file.txt:
This is the first line.
and for std.file:
https://dlang.org/phobos/std_file.html
Error writing file a *.obj
Hi :)
- OS: Winodws 10 Pro KN
- DMD: 2.073.2(ofcourse, i tried dmd of 2.074.x version. but
same result)
When i build some application with dub, i got this error:
--
dub build
xx ~master: building configuration "application"...
Error: Error writing file
'.dub\build\application-debug-windows-x86-dmd_2073-FEC52DAD217DFEA46ECF98CA4240FA06\xx.obj'
dmd failed with exit code 1
--
What's mean? my dub.json here:
--
{
"name": "xx",
"authors": [
"dummy"
],
"description": "A minimal D application.",
"copyright": "Copyright © 2017, dummy",
"license": "proprietary",
"dependencies": {
"requests": "~>0.4.1"
},
"subConfigurations": {
"requests": "vibed"
}
}
--
app.d is default file, so i didn't modify it.
File Input
Hi guys I'd like to know how to get an input from the user to be stored in a .txt file using import std.file and is it possible to directly write in a .txt file without using a variable to store the user input? Thanks for the answer in advance my mind is kinda jumbled about this since im new to this language.
Re: How can I pass an argument to rdmd --evel=
On Sunday, 7 May 2017 at 11:29:30 UTC, k-five wrote: It should be possible! rdmd --eval=, without accepting argument is useless. FWIW, you can still pass input through stdin.
Re: Looking for an equivalent to C++ std::getline in D
On Sunday, 7 May 2017 at 10:33:25 UTC, k-five wrote: Although I found D for being more better, nicer,and fun than C++ is, but there is a few questions on Stack-Over-Flow, videos on Youtube, and some other forums in my country. So, why D is not popular? If by popular you mean C++ or Java levels of usage, that's a pretty high standard. While D is not among the most used languages in large enterprises, it is definitely not an obscure language. For example, just a few days ago I was reading about the new Scala Native project. Among the motivations for that project is "Scala Native provides an interop layer that makes it easy to interact with foreign native code. This includes C and other languages that can expose APIs via C ABI (e.g. C++, D, Rust etc.)" [0] You have to be careful about using stackoverflow as a measure of language popularity. Most activity takes place on this mailing list, which was going long before stackoverflow, and there was little motivation to move there (Google searches will bring you here). One of the few quantitative measures (and even that's of limited use) is DMD downloads from this site. Most recently they have been at about 50,000 per month.[1] [0] http://www.scala-native.org/en/latest/user/interop.html [1] http://erdani.com/d/downloads.daily.png
Re: Looking for an equivalent to C++ std::getline in D
On Sunday, 7 May 2017 at 10:33:25 UTC, k-five wrote: On Sunday, 7 May 2017 at 09:46:22 UTC, Patrick Schluter wrote: On Saturday, 6 May 2017 at 10:15:03 UTC, k-five wrote: If you want to learn the basis of the range concept and their link to C++ Iterators, you should definitively read Andrei's article on them in the InformIT magazine. Here is the link http://www.informit.com/articles/printerfriendly/1407357 required read for every aspiring D programmer ;-) --- Thanks for the article. Although I found D for being more better, nicer,and fun than C++ is, but there is a few questions on Stack-Over-Flow, videos on Youtube, and some other forums in my country. So, why D is not popular? Because everyone is asking this question instead of actually doing something about it :) To be fair, D has a good amount of usage even today, it's just not being screamed about ecstatically. I am a big fan of Perl-one-liner and after seeing rdmd --evel='one-line-code' I gasped! Oh, really? a one-liner with D! Or even Unix Command Line, that D has Uniform Function Call Syntax. line.sort.uniq.writeln(); It may you know about the future of D or may introduce some other articles about the future of D to me. Since after learning C++ I am not very comfortable with. Today is the last day of the D Conference 2017, last three days it was livestreaming. There were quite a bit of talks on current developments and future progress. The videos from those streams should appear at https://www.youtube.com/user/sociomantic/videos hopefully early next week. They also have previous conference videos out there.
Re: How can I pass an argument to rdmd --evel=
On Sunday, 7 May 2017 at 11:11:05 UTC, Vladimir Panteleev wrote:
On Sunday, 7 May 2017 at 10:49:25 UTC, k-five wrote:
After reading about rdmd and --eval, I tried this:
rdmd --eval='auto f=File("ddoc.html");foreach(line;f.byLine)
if(line.length<10) writeln(line);f.close'
and worked!
Now I am wonder if there is a way to pass "ddoc.html" to this
one-liner? that can work with --loop.
I mean:
// --loop by default has foreach(line ...
// like perl -n
rdmd --loop='if( line.length < 10 ) writeln( line );' ddoc.html
but it is an error in syntax and rdmd says:
Cannot have both --eval and a program file ('ddoc.html')
Currently it's not possible:
It should be possible!
rdmd --eval=, without accepting argument is useless.
Re: How can I pass an argument to rdmd --evel=
On Sunday, 7 May 2017 at 11:11:05 UTC, Vladimir Panteleev wrote: Currently it's not possible: https://issues.dlang.org/show_bug.cgi?id=13345
Re: How can I pass an argument to rdmd --evel=
On Sunday, 7 May 2017 at 10:49:25 UTC, k-five wrote:
After reading about rdmd and --eval, I tried this:
rdmd --eval='auto f=File("ddoc.html");foreach(line;f.byLine)
if(line.length<10) writeln(line);f.close'
and worked!
Now I am wonder if there is a way to pass "ddoc.html" to this
one-liner? that can work with --loop.
I mean:
// --loop by default has foreach(line ...
// like perl -n
rdmd --loop='if( line.length < 10 ) writeln( line );' ddoc.html
but it is an error in syntax and rdmd says:
Cannot have both --eval and a program file ('ddoc.html')
Currently it's not possible:
How can I pass an argument to rdmd --evel=
After reading about rdmd and --eval, I tried this:
rdmd --eval='auto f=File("ddoc.html");foreach(line;f.byLine)
if(line.length<10) writeln(line);f.close'
and worked!
Now I am wonder if there is a way to pass "ddoc.html" to this
one-liner? that can work with --loop.
I mean:
// --loop by default has foreach(line ...
// like perl -n
rdmd --loop='if( line.length < 10 ) writeln( line );' ddoc.html
but it is an error in syntax and rdmd says:
Cannot have both --eval and a program file ('ddoc.html')
Re: Looking for an equivalent to C++ std::getline in D
On Sunday, 7 May 2017 at 09:46:22 UTC, Patrick Schluter wrote: On Saturday, 6 May 2017 at 10:15:03 UTC, k-five wrote: If you want to learn the basis of the range concept and their link to C++ Iterators, you should definitively read Andrei's article on them in the InformIT magazine. Here is the link http://www.informit.com/articles/printerfriendly/1407357 required read for every aspiring D programmer ;-) --- Thanks for the article. Although I found D for being more better, nicer,and fun than C++ is, but there is a few questions on Stack-Over-Flow, videos on Youtube, and some other forums in my country. So, why D is not popular? I am a big fan of Perl-one-liner and after seeing rdmd --evel='one-line-code' I gasped! Oh, really? a one-liner with D! Or even Unix Command Line, that D has Uniform Function Call Syntax. line.sort.uniq.writeln(); It may you know about the future of D or may introduce some other articles about the future of D to me. Since after learning C++ I am not very comfortable with.
Re: Looking for an equivalent to C++ std::getline in D
On Saturday, 6 May 2017 at 10:15:03 UTC, k-five wrote: Although I am not sure but it may Range in D, has the same concept that C++ has on iterator, like InputIterator or OutputIterator, since I realized that the output of [ filter ] does not have RandomAccessRange so I can not use input[ 0 ]. But I can use input.front(). If you want to learn the basis of the range concept and their link to C++ Iterators, you should definitively read Andrei's article on them in the InformIT magazine. Here is the link http://www.informit.com/articles/printerfriendly/1407357 required read for every aspiring D programmer ;-)
