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digitalmars.D.bugs - [Issue 7007] New: [] should have a type of its own

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7007

           Summary: [] should have a type of its own
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: timon.gehr gmx.ch


--- Comment #0 from timon.gehr gmx.ch 2011-11-25 13:20:47 PST ---
Now that null has an own type (issue 5416), typeof([]) == void[] is
inconsistent.

Consider:

void foo(int[] x){}

void bar(T)(T x){foo(x);}


void main(){
    foo(null); // ok
    foo([]);   // ok
    bar(null); // ok!
    bar([]);   // fail
}

This example should compile.

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next sibling parent d-bugmail puremagic.com writes:
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--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2011-11-26 00:43:39 PST ---
There are some implementation issues.

If you name an unspecified element type as 'Nothing',

auto a  = [];         // Nothing[]
auto b1 = [[]];       // Nothing[][]
auto b2 = [[], null]; // Nothing[][], but its runtime is different from b1

int[][] na1 = b1;     // may need runtime allocation and conversion
int[][] na2 = b2;     // may need runtime allocation and conversion

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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--- Comment #2 from timon.gehr gmx.ch 2011-11-26 07:25:17 PST ---
Nothing[][] is not a subtype of int[][]. The assignments should not even
compile.

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prev sibling parent d-bugmail puremagic.com writes:
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bearophile_hugs eml.cc changed:

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--- Comment #3 from bearophile_hugs eml.cc 2012-08-26 04:38:24 PDT ---
See also Issue 8589

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