www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 1625] New: cannot evaluate function compile-time when return type includes a union

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1625

           Summary: cannot evaluate function  compile-time when return type
                    includes a union
           Product: D
           Version: 2.006
          Platform: PC
               URL: http://paste.dprogramming.com/dpjhoxzy
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: spam extrawurst.org


dmd refuses to compile the following legal code:

[CODE]
struct Foo {

    union {
        struct {
            float x,y,z;
        }
        float[3] _v;
    }

    static Foo bar(){
        Foo f;
        return f;
    }
}

void main() {
    const Foo foo = Foo.bar();//Error: cannot evaluate bar() at compile time
}
[/CODE]

i hope i am right that it should work and is valid code.


--
Oct 29 2007
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1625






this examples seems to work now, was it intentionally fixed in 2.008? it's not
in the changelog.


--
Nov 28 2007
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1625


spam extrawurst.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |spam extrawurst.org





ok the above example works under dmd2.008 just cause of the changes in the
const thing, when involving static it isnt able to evaluate the union stuff
 compile time again:

[CODE]
struct Foo {

    union {
        struct {
            float x,y,z;
        }
        float[3] _v;
    }

    static Foo bar(){
        Foo f;
        return f;
    }
}

void main() {
    static Foo foo = Foo.bar();//Error: cannot evaluate bar() at compile time
}
[/CODE]


--
Nov 29 2007
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1625


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au
            Summary|cannot evaluate function    |CTFE: cannot evaluate
                   | compile-time when return   |function when return type
                   |type includes a union       |includes a union





Actually it cannot evaluate any function which involves reading the value of a
union. (It can WRITE to a union, though!)

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
Aug 26 2009