Re: map on char[] converts to dchar?

[pineapple via Digitalmars-d-learn]

It is worth noting too that mach's map function will not behave 
this way; UTF encoding and decoding is instructed explicitly and 
is not done implicitly like in phobos.


https://github.com/pineapplemachine/mach.d

import mach.range : map, asarray;
import mach.text.ascii : toupper;

void main(){
char[] x = ['h', 'e', 'l', 'l', 'o'];
char[] y = x.map!toupper.asarray();
assert(y == "HELLO");
}

Re: map on char[] converts to dchar?

[Seb via Digitalmars-d-learn]

On Monday, 24 July 2017 at 09:05:43 UTC, Johan wrote:

Hi all,
  What am I doing wrong here?
```
import std.algorithm;
int foo(char c) {
return 123;
}
auto mapFoo(char[] chars) {
return chars.map!(a => a.foo);
}
```
errors with:
main.d(14): Error: function main.foo (char c) is not callable 
using argument types (dchar)

/Library/D/dmd/src/phobos/std/algorithm/iteration.d(492):
 instantiated from here: MapResult!(__lambda2, char[])
main.d(14):instantiated from here: map!(char[])

(Things work after changing foo to accept dchar, but I don't 
want that.)


Thanks,
  Johan


Have a look at https://tour.dlang.org/tour/en/gems/unicode

tl;dr: it's auto-decoding and you can avoid it with e.g. byChar

map on char[] converts to dchar?

[Johan via Digitalmars-d-learn]

Hi all,
  What am I doing wrong here?
```
import std.algorithm;
int foo(char c) {
return 123;
}
auto mapFoo(char[] chars) {
return chars.map!(a => a.foo);
}
```
errors with:
main.d(14): Error: function main.foo (char c) is not callable 
using argument types (dchar)
/Library/D/dmd/src/phobos/std/algorithm/iteration.d(492):
instantiated from here: MapResult!(__lambda2, char[])

main.d(14):instantiated from here: map!(char[])

(Things work after changing foo to accept dchar, but I don't want 
that.)


Thanks,
  Johan