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Bug 10221 – foreach(char c; 0..256) doesn't work even though the upper bound is 255

Status: RESOLVED
Resolution: FIXED
Severity: normal
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2013-05-31T16:32:00Z
Last change time: 2014-02-08T09:22:18Z
Keywords: pull, rejects-valid
Assigned to: nobody
Creator: thelastmammoth

Comments

Comment #0 by thelastmammoth — 2013-05-31T16:32:55Z

foreach(char c; 0..256) doesn't work even though the upper bound is 255: Error: cannot implicitly convert expression (256) of type int to char Maybe instead disallow: foreach(char c; 0..257) ? Is that a bug, or how would we achieve iterating over all chars without resorting to : foreach(c_; 0..256){ char c=c_.to!char; }

Comment #1 by andrej.mitrovich — 2013-05-31T18:39:10Z

This is similar to what I've ran into 2 years ago: http://www.digitalmars.com/d/archives/digitalmars/D/learn/Foreach_with_byte_problems_24997.html

Comment #2 by yebblies — 2013-11-21T07:13:18Z

void test10221() { foreach(char c; 0..256) { } } https://github.com/D-Programming-Language/dmd/pull/2847

Comment #3 by github-bugzilla — 2014-02-08T08:31:18Z

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/ce5cffc4493db9e9fba57476e564fb7a4a9553eb Fix Issue 10221 - foreach(char c; 0..256) doesn't work even though the upper bound is 255 https://github.com/D-Programming-Language/dmd/commit/d3ea1fb833ca49d56df23a400e4e93e50b5eac2b Merge pull request #2847 from yebblies/issue10221 Issue 10221 - foreach(char c; 0..256) doesn't work even though the upper bound is 255

Comment #4 by bearophile_hugs — 2014-02-08T09:22:18Z

This is a small but quite useful improvement of the D type system.