• d-bugmail puremagic.com (58/58) Apr 08 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7866
• d-bugmail puremagic.com (13/13) May 29 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7866

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=7866

           Summary: Type printing too for single nulls
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc


--- Comment #0 from bearophile_hugs eml.cc 2012-04-08 17:23:23 PDT ---
D2 code:

import std.stdio;
class Foo {}
void main() {
    Foo[] bar = [null, new Foo];
    foreach (f; bar)
        writeln(f);
}


Output, DMD 2.059beta3:

null
test.Foo


But the first null is a Foo class empty reference, it's not just a null. So I'd
like writeln to print more information about the type of the null, with an
output like this:

cast(Foo)null
test.Foo

Or:

cast(test.Foo)null
test.Foo


If you want similar output is useful for structs too:

import std.stdio;
struct Foo {}
void main() {
    Foo* f;
    writeln(f);
}


Currently prints:

null


But a better and more informative output may be:

cast(Foo*)null

Or:

cast(test.Foo*)null


Inside collections probably "null" is enough still, to avoid a too much long
output:

import std.stdio;
struct Foo {}
void main() {
    Foo*[] a = [null, null];
    writeln(a);
}


Current output, acceptable:

[null, null]

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=7866


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2012-05-29 00:55:57 PDT ---
See my comment in here:
http://d.puremagic.com/issues/show_bug.cgi?id=8040#c3

*** This issue has been marked as a duplicate of issue 8040 ***

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