Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 21:35:18 UTC, visitor wrote:
On Monday, 25 December 2017 at 21:11:08 UTC, aliak wrote:
On Monday, 25 December 2017 at 17:59:54 UTC, visitor wrote:
On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote:
On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote:
probably better this way
int[2] tmp;
auto points = data.split(':')
.map!( (a) {
a.split(',').map!(to!int).enumerate()
.each!( (i, el) => tmp[i] = el );
return Point(tmp);
} );
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 21:11:08 UTC, aliak wrote:
On Monday, 25 December 2017 at 17:59:54 UTC, visitor wrote:
On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote:
On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote:
I was kind of hoping for some magical D variadic alias
template on Tuple or something that will just deconstruct the
arguments in to tuple components.
i don't think it's better but :
https://run.dlang.io/is/2rgOzh
Heh, no it's probably not, but interesting! So it does work
with a static array. Is it that .array on a range is not able
to infer a size and hence produce a static array for the given
situation? Is this a D limitation, a logical one or maybe just
not implemented yet?
Cheers!
i don't know the reason, and would be glad to be unlighted :)
There is a Tuple constructor which takes a static array as a
param :
https://dlang.org/phobos/std_typecons.html#.Tuple.this.2
i needed to iterate with an index when building the static array
later, so i transformed the range (a.split(',').map!(to!int))
into a dynamic array, to do so.
one could use std.range enumerate() instead:
auto points = data.split(':')
.map!( a => a.split(',').map!(to!int) )
.map!( (a) {
int[2] staticArray;
foreach (i, el; a.enumerate())
staticArray[i] = el;
return staticArray;
} )
.map!Point;
Cheers
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 17:59:54 UTC, visitor wrote:
On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote:
On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote:
I was kind of hoping for some magical D variadic alias
template on Tuple or something that will just deconstruct the
arguments in to tuple components.
i don't think it's better but :
https://run.dlang.io/is/2rgOzh
oops sorry, compile time ...
import std.stdio, std.string, std.algorithm, std.conv, std.range;
import std.typecons;
alias Point = Tuple!(int, "x", int, "y");
enum data = "1,2:8,9";
auto points = data.split(':')
.map!( a => a.split(',').map!(to!int).array )
.map!( (da) {
int[2] staticArray;
foreach (i, el; da)
staticArray[i] = el;
return staticArray;
} )
.map!Point ;
void main()
{
writefln("points : %s", points);
}
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 17:59:54 UTC, visitor wrote: On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote: On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote: I was kind of hoping for some magical D variadic alias template on Tuple or something that will just deconstruct the arguments in to tuple components. i don't think it's better but : https://run.dlang.io/is/2rgOzh Heh, no it's probably not, but interesting! So it does work with a static array. Is it that .array on a range is not able to infer a size and hence produce a static array for the given situation? Is this a D limitation, a logical one or maybe just not implemented yet? Cheers!
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 15:03:08 UTC, aliak wrote: On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote: I was kind of hoping for some magical D variadic alias template on Tuple or something that will just deconstruct the arguments in to tuple components. i don't think it's better but : https://run.dlang.io/is/2rgOzh
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 14:08:08 UTC, Mengu wrote: since Point is a Tuple and does not have a constructor that takes a list of integers (int[]), you should have a helper function. Aukay :( I was kind of hoping for some magical D variadic alias template on Tuple or something that will just deconstruct the arguments in to tuple components.
Re: Converting array in to aliased tuple type.
On Monday, 25 December 2017 at 12:03:32 UTC, aliak wrote:
Hi, been looking for a way to convert an array to a tuple, but
can't seem to find one. Is there one?
Looking for something like:
alias Point = Tuple!(int, "x", int, "y");
enum data = "1,2:8,9";
auto points = data
.split(':')
.map!(a => a
.split(',')
.map!(to!int)
)
.map!Point; // <-- this works if you do `.map!(a =>
Point(a[0], a[1]));` instead
Cheers!
hi aliak
since Point is a Tuple and does not have a constructor that takes
a list of integers (int[]), you should have a helper function.
import std.stdio: writeln;
import std.string: split;
import std.algorithm: map;
import std.typecons: Tuple;
import std.conv: to;
alias Point = Tuple!(int, "x", int, "y");
enum data = "1,2:8,9";
alias makePoint = (auto ref points) => Point(points[0],
points[1]);
alias convertToInt = (string parts) =>
parts.split(',').map!(to!int);
auto points =
data.split(':').map!(convertToInt).map!(makePoint);
writeln(points);
Converting array in to aliased tuple type.
Hi, been looking for a way to convert an array to a tuple, but
can't seem to find one. Is there one?
Looking for something like:
alias Point = Tuple!(int, "x", int, "y");
enum data = "1,2:8,9";
auto points = data
.split(':')
.map!(a => a
.split(',')
.map!(to!int)
)
.map!Point; // <-- this works if you do `.map!(a => Point(a[0],
a[1]));` instead
Cheers!
