Re: Inconsistent chain (implicitly converts to int)
On Saturday, 6 April 2024 at 09:21:34 UTC, rkompass wrote:
I checked:
```d
import std.stdio,
std.range,
std.algorithm;
struct N(T)
{
T last, step, first;
bool empty() => first >= last;
T front() => first;
auto popFront() => first += step;
}
void main() {
auto r1 = N!size_t(10, 1, 1);
auto r2 = N!real(15, .5, 10);
```
and it seems to work as I said.
Thank you for checking again, but it is important to be solution
oriented. How about Tuple?
Yes, it might be wise to use a tuple in this case:
```d
//...
auto tuple = a.zip(b);
tuple.writeln;
// [Tuple!(int, dchar)(97, 'd'), Tuple!(int, dchar)(98, 'e'),
Tuple!(int, dchar)(99, 'f')]
tuple.map!(num => num[0].to!dchar).write;
tuple.map!"a[1]".writeln; // abcdef
}
```
SDB@79
Re: Inconsistent chain (implicitly converts to int)
On Friday, 5 April 2024 at 21:26:10 UTC, Salih Dincer wrote:
On Friday, 5 April 2024 at 21:16:42 UTC, rkompass wrote:
In the first example the int's are converted to doubles (also
common type).
But they appear as int's because writeln does not write a
trailing .0.
But it doesn't work as you say! I even tried it on an older
version and got the same result.
SDB@79
I checked:
```d
import std.stdio,
std.range,
std.algorithm;
struct N(T)
{
T last, step, first;
bool empty() => first >= last;
T front() => first;
auto popFront() => first += step;
}
void main() {
auto r1 = N!size_t(10, 1, 1);
auto r2 = N!real(15, .5, 10);
// r1.chain(r2).writeln;
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10.5, 11, 11.5, 12, 12.5,
13, 13.5, 14, 14.5]
r1.chain(r2).map!(x => typeid(x)).writeln;
// [real, real, . . . , real]
}
```
and it seems to work as I said.
Re: Inconsistent chain (implicitly converts to int)
On Friday, 5 April 2024 at 21:16:42 UTC, rkompass wrote: In the first example the int's are converted to doubles (also common type). But they appear as int's because writeln does not write a trailing .0. But it doesn't work as you say! I even tried it on an older version and got the same result. SDB@79
Re: Inconsistent chain (implicitly converts to int)
On Friday, 5 April 2024 at 16:05:20 UTC, H. S. Teoh wrote: On Fri, Apr 05, 2024 at 03:18:09PM +, Salih Dincer via Digitalmars-d-learn wrote: Hi everyone, Technically r1 and r2 are different types of range. Isn't it inconsistent to chain both? If not, why is the char type converted to int? [...] It's not inconsistent if there exists a common type that both range element types implicit convert to. The real problem is the implicit conversion of char to int, which I have been against for a long time. Walter, however, disagrees. T ```d auto a = [97, 98, 99]; auto b = ['d', 'e', 'f']; a.chain(b).map!(chr => chr.to!char).writeln; // abcdef ``` Nice, there is a solution that requires memory allocation, but it still makes you think! However, they can fix this in Phobos3 because now we have this too: https://dlang.org/changelog/2.108.0.html#range_predicate_element PS. I think I unintentionally made a chain by repeating the source code above, sorry :) SDB@79
Re: Inconsistent chain (implicitly converts to int)
On Friday, 5 April 2024 at 16:05:20 UTC, H. S. Teoh wrote: On Fri, Apr 05, 2024 at 03:18:09PM +, Salih Dincer via Digitalmars-d-learn wrote: Hi everyone, Technically r1 and r2 are different types of range. Isn't it inconsistent to chain both? If not, why is the char type converted to int? [...] It's not inconsistent if there exists a common type that both range element types implicit convert to. In the first example the int's are converted to doubles (also common type). But they appear as int's because writeln does not write a trailing .0.
Re: Inconsistent chain (implicitly converts to int)
On Fri, Apr 05, 2024 at 03:18:09PM +, Salih Dincer via Digitalmars-d-learn wrote: > Hi everyone, > > Technically r1 and r2 are different types of range. Isn't it > inconsistent to chain both? If not, why is the char type converted to > int? [...] It's not inconsistent if there exists a common type that both range element types implicit convert to. The real problem is the implicit conversion of char to int, which I have been against for a long time. Walter, however, disagrees. T -- What's worse than raining cats and dogs? Hailing taxis!
