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