On 05/03/2018 07:56 AM, rikki cattermole wrote:
``` import std.stdio; import std.range : enumerate;void main() { char[] s = ['a','b','c']; char[3] x; auto i = 0; foreach(c; s) { x[i] = c; i++; } writeln(x); } ``` Above works without cast. ''' import std.stdio; import std.range : enumerate; void main() { char[] s = ['a','b','c']; char[3] x; foreach(i, c; enumerate(s)) { x[i] = c; i++; } writeln(x); } ```
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The first example uses auto-decoding (UTF-8 codepoints into a single UTF-32 one). This is considered a bad thing. But the compiler can disable it and leave it as UTF-8 code point upon request.
The first example (foreach over a char[]) doesn't do any decoding. UTF-8 stays UTF-8.
Also, a `char` is a UTF-8 code *unit*, not a code *point*.
The second example returns a Voldemort type (means no-name) which happens to be an input range. Where it can't disable anything and has been told that it is returning a dchar. See[0] as to where this gets decoded.
This is auto decoding.
Writing two small functions to replace it (and popFront), will override this behavior.
This sounds like you can disable auto decoding by providing your own range primitives in your own module. That doesn't work, because Phobos would still use the ones from std.range.primitives.
[0] https://dlang.org/phobos/std_range_primitives.html#.front
