http://d.puremagic.com/issues/show_bug.cgi?id=3508

           Summary: hasLength is broken for length defined as function
           Product: D
           Version: 2.036
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nob...@puremagic.com
        ReportedBy: k-fo...@onu.edu


--- Comment #0 from Kyle Foley <k-fo...@onu.edu> 2009-11-14 12:00:35 PST ---
import std.stdio;

struct Test1 { ulong length(); }
struct Test2 { ulong length; }
struct Test3 { string length; }

/* Definition from std.range

template hasLength(R)
{
    enum bool hasLength = is(typeof(R.init.length) : ulong);
}
*/

template hasLength(R)
{
    enum bool hasLength = is(typeof({
        auto r = R.init;
        auto l = r.length;
        static assert( is(typeof(l) : ulong) );
    }()));
}

int main(string[] args)
{
    writeln( std.range.hasLength!(Test1) ); // false
    writeln( std.range.hasLength!(Test2) ); // true
    writeln( std.range.hasLength!(Test3) ); // false

    writeln( test.hasLength!(Test1) ); // true
    writeln( test.hasLength!(Test2) ); // true
    writeln( test.hasLength!(Test3) ); // false

    return 0;
}

---

I included my proposed fix as test.hasLength.

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