• d-bugmail puremagic.com (29/37) Mar 08 2010 http://d.puremagic.com/issues/show_bug.cgi?id=3894

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=3894

           Summary: std.range.Stride!R requires R.front() and R.back() to
                    return by reference
           Product: D
           Version: 2.041
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bugzilla kyllingen.net



03:58:32 PST ---
Quoting Mihail Strashun on the digitalmars.D.learn newsgroup:
---
Following simple program fails to compile with latest DMD 2.041 (In fact it
fails to compile with any dmd2 version i have tried):

"test.d"
 import std.stdio;
 import std.range;
 import std.algorithm;

 int main()
 {
   auto test = stride( iota(0,10,1) , 2 );
   return 0;
 }

Output:
[mist mistwork d]$ dmd -run test.d
/usr/include/d/std/range.d(716): Error: this._input.front() is not an lvalue
/usr/include/d/std/range.d(724): Error: this._input.back() is not an lvalue
---

The problem is that Stride.front() and Stride.back() are defined to return by
reference, which is not the case for all ranges.

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