[Issue 6617] New: Two problems using enum lenghs

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6617

           Summary: Two problems using enum lenghs
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          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 2011-09-07 02:10:03 PDT ---
This is a bug report. I have found two different problems while creating a
fixed-sized array as long as the number members of an enum (DMD 2.055beta3):


import std.traits: EnumMembers;
enum Foo : size_t { A = 0, B = 1, C = 2 }
void main() {
    int[(EnumMembers!(Foo)).length] bar1; // Error: EnumMembers!(Foo) is used
as a type
    enum size_t nmembers0 = (EnumMembers!(Foo)).length; // Error:
EnumMembers!(Foo) is used as a type
    alias EnumMembers!(Foo) members;
    int[members.length] bar2; // Error: identifier 'length' of 'members.length'
is not defined
    enum size_t nmembers = members.length;
    int[nmembers] bar3; // OK
}


---------------

In practice I think a length attribute for enums is handy to have (this is a
low-priority enhacement request):


enum Foo : size_t { A = 0, B = 1, C = 2 }
void main() {
    int[Foo.length] bar;
}

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