[Issue 4111] New: Foreach ranges accept floating-point extrema

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4111

           Summary: Foreach ranges accept floating-point extrema
           Product: D
           Version: future
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2010-04-21 14:01:40 PDT ---
This D2 code works with dmd 2.043, it shows that foreach accepts floating point
extrema too.

But I think it's safer/tidier to accept only ranges with integral extrema (in
Python too the range/xrange expects integers). FP approximations can cause
problems here.


import std.stdio;
import std.math: nextUp;
void main() {
    foreach(i; 2.1 .. 4.10001) {
        writeln(typeid(typeof(i))); // Output: double
        break;
    }
    foreach(i; 2.1 .. nextUp(4.1))
        write(i, " "); // Output: 2.1 3.1 4.1
}

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