www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 2608] New: int[] literal too polysemous

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2608

           Summary: int[] literal too polysemous
           Product: D
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: andrei metalanguage.com


The following code fails:

void next(T)(ref T[] a) { assert(a.length); a = a[1 .. $]; }

void main()
{
    auto a = [ 1, 2, 3 ];
    a.next;
    assert(a == [ 2, 3 ]);
}

If one replaces "auto" with "int[]", the code compiles and runs as expected. It
looks like auto with literals tries too hard to keep it around as an rvalue.

This seems to be related to issue 2606.


--
Jan 23 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2608






The problem is that an array literal has a static array type by default.
Wouldn't it be more user-friendly for it to be a dynamic array type?


--
Jan 23 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2608








 The problem is that an array literal has a static array type by default.
 Wouldn't it be more user-friendly for it to be a dynamic array type?


Oh, you are right. Walter did change the default type of literals to
dynamic-length, but apparently only for strings.


--
Jan 23 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2608


2korden gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |2.021





Could you please post generated error message, too, so that other don't have to
guess? :)

...
a.next; // Error: cast(int[])a is not an lvalue
...


--
Jan 23 2009
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2608


bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bearophile_hugs eml.cc
         Resolution|                            |FIXED



That code works with dmd 2.050.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
Oct 29 2010