• klickverbot (27/27) Oct 16 2010 As you might know from the main D NG, I have just started to solve a few...
• klickverbot (10/26) Oct 16 2010 Okay, after experimenting for a bit, I found that this works:
• klickverbot (2/2) Oct 16 2010 Forget it, I took this directly to bugzilla:

klickverbot <see klickverbot.at> writes:

As you might know from the main D NG, I have just started to solve a few 
little programming puzzles with D2/Phobos to test how well especially 
the algorithm/range stuff in Phobos works out in more-or-less real world 
use cases.

To solve a Caesar-cipher related challenge (from hacker.org, by the 
way), I wrote up the following simple program:

---
import std.algorithm;
import std.stdio;

enum INPUT = "cqrb lryqna rb fjh, fjh qjamna cqjw axc cqracnnw. qnan, 
hxd wnena twxf qxf oja cx bqroc! xq kh cqn fjh, cqn jwbfna rb 
mnjmvjwblqnbc.";

void main() {
    foreach ( offset; 0..25 ) {
       writeln( map!( ( dchar c ) {
          if ( c < 'a' ) return c;
          if ( 'z' < c ) return c;
          return cast( dchar )( ( ( ( c - 'a' ) + offset ) % 26 ) + 'a' );
       } )( INPUT ) );
    }
}
---

Seems reasonable, right? Using DMD 2.049, however, it segfaults in the 
delegate literal. Why this? Have I missed something obvious?

If you don't want to compile it yourself, I have posted the backtrace 
here: http://gist.github.com/630201

David

klickverbot <see klickverbot.at> writes:

On 10/16/10 10:13 PM, klickverbot wrote:
 ---
 import std.algorithm;
 import std.stdio;

 enum INPUT = "cqrb lryqna rb fjh, fjh qjamna cqjw axc cqracnnw. qnan,
 hxd wnena twxf qxf oja cx bqroc! xq kh cqn fjh, cqn jwbfna rb
 mnjmvjwblqnbc.";

 void main() {
 foreach ( offset; 0..25 ) {
 writeln( map!( ( dchar c ) {
 if ( c < 'a' ) return c;
 if ( 'z' < c ) return c;
 return cast( dchar )( ( ( ( c - 'a' ) + offset ) % 26 ) + 'a' );
 } )( INPUT ) );
 }
 }
 ---

Okay, after experimenting for a bit, I found that this works:

       writeln( map!( ( c ){
          return offset;
       } )( INPUT ) );

While this segfaults:

       writeln( map!( ( c ){
          return cast( dchar )( offset );
       } )( INPUT ) );

I guess this should go to bugzilla, right?

klickverbot <see klickverbot.at> writes:

Forget it, I took this directly to bugzilla:
http://d.puremagic.com/issues/show_bug.cgi?id=5064