Hello,
I am new with D and want to convert a c program for a csv file
manipulation with exhaustive dynamic memory mechanics to D .
When reading a CSV-file line by line I would like to create an
associative array to get the row values by the value in the
second column.
Although I save the row
Thank you T for your hint. This worked perfectly
On Saturday, 20 January 2024 at 14:44:49 UTC, H. S. Teoh wrote:
Because .byLine reuses its line buffer. You want .byLineCopy
instead.
The section looks now simpler although I guess that there are
more appropriate mechanisms available (csvreader
Hello,
D-Language allows for anonymous functions.
Is there a way of elegant partial function application such as in
other (functional) languages?
A function "doemar" accepts a function with one parameter,
Another function g defined within mail accepts two parameters and
should be applied parti
On Saturday, 20 January 2024 at 17:45:36 UTC, Christian Köstlin
wrote:
Would
https://dlang.org/library/std/functional/curry.html
help you?
kind regards,
Christian
Hello Christian,
thank for the link. I looks good however in my installation (gdc
8.4.0) it says:
```d
curry.d:1:8: error: modul
On Saturday, 20 January 2024 at 17:47:29 UTC, Richard (Rikki)
Andrew Cattermole wrote:
Not really any other way to do it, create context (i.e. struct,
or stack) and have a delegate point to both it and a patch
function.
It'll be how partial is implemented.
https://dlang.org/phobos/std_functio
On Saturday, 20 January 2024 at 20:58:49 UTC, Richard (Rikki)
Andrew Cattermole wrote:
On 21/01/2024 9:55 AM, atzensepp wrote:
import std.stdio; // Overloads are resolved when the partially
applied function is called // with the remaining arguments.
struct S { static char fun(int i, string s) {
On Sunday, 21 January 2024 at 03:54:35 UTC, zjh wrote:
On Thursday, 18 January 2024 at 03:07:13 UTC, zjh wrote:
```d
void toV(string a,ref vector!string b){
auto f=File(a,"r");
while(!f.eof()){
string l=strip(f.readln());push(b,l);
}
Qwk(b);
}//
```
There is an issue wi
On Sunday, 21 January 2024 at 20:13:38 UTC, An Pham wrote:
On Saturday, 20 January 2024 at 15:59:59 UTC, Anonymouse wrote:
I remember reading this was an issue and now I ran into it
myself.
```d
import std.stdio;
void main()
{
auto names = [ "foo", "bar", "baz" ];
void delegate()[] dg
In Ocaml this would look as:
```d
let names =["foo";"bar";"baz"] in
let funmap = List.map ( fun name -> ( fun () -> print_endline
name)) names in
List.iter ( fun f -> f () ) funmap
;;
~
```
I think in the D-example it is basically one function and not 3.
Dear D-gurus,
being new to D I am trying my first steps and the language is
quite intuitive and appealing.
When reading a file and creating a hash for the reocrds I want to
get only the most recent ones. For this I need to convert
Date/Time-Strings to comparable DateTime-Objects.
The code belo
How is it possible to compose functions?
I came up with following solution that is not satisfactory
for two reasons:
1. the compose function should be argument agnostic
here it is explicitly coded for (int) -> (int)
2. the composition itself requires additional lambda
exp
Some progress: compose function needs to know type but templates
help to create for different types.
```d
import std.stdio;
import std.container.array;
// Function composition:
int f(int x) { return x*2;} ;
int g(int x) { return x+2;} ;
double ff(double x) { return x*x;} ;
double gg(double x
On Wednesday, 24 January 2024 at 21:34:26 UTC, user1234 wrote:
On Wednesday, 24 January 2024 at 21:30:23 UTC, user1234 wrote:
On Wednesday, 24 January 2024 at 21:12:20 UTC, atzensepp wrote:
[...]
what a bummer!
Have you tried
https://dlang.org/phobos/std_functional.html#compose ?
Well this
On Thursday, 25 January 2024 at 12:19:47 UTC, Paul Backus wrote:
On Thursday, 25 January 2024 at 08:25:02 UTC, atzensepp wrote:
```d
int function(int) t = compose!(f,g,g,f,g,g,f,g,g,f);
```
This leads to:
```
gdc lambda4.d
lambda4.d:28:25: error: template compose(E)(E a) has no value
int f
On Monday, 29 January 2024 at 19:24:51 UTC, Inkrementator wrote:
On Thursday, 25 January 2024 at 18:44:26 UTC, atzensepp wrote:
However this works:
```d
int delegate (int) td = (x) =>
compose!(f,g,g,f,g,g,f,g,g,f)(x);
```
While not a real function pointer, this might already fit your
nee
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