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digitalmars.D.bugs - [Issue 7110] New: static opSlice & opIndex functions don't work as template arguments

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7110

           Summary: static opSlice & opIndex functions don't work as
                    template arguments
           Product: D
           Version: D1 & D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: verylonglogin.reg gmail.com


--- Comment #0 from Denis <verylonglogin.reg gmail.com> 2011-12-14 16:29:58 MSK
---
---
struct S { }

struct Call
{
    static S opSlice() { return S(); }
    static S opIndex(size_t) { return S(); }
}


template Template(Args...)
{
    static assert(is(typeof(Args[0]) == S));
}

alias Template!(S()) A0; // passes
alias Template!(Call.opSlice())  A1; // passes
alias Template!(Call.opIndex(0)) A2; // passes
alias Template!(Call[])  A3; // failes
alias Template!(Call[0]) A4; // failes
---

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7110


Robert Clipsham <robert octarineparrot.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |robert octarineparrot.com


--- Comment #1 from Robert Clipsham <robert octarineparrot.com> 2011-12-14
13:54:49 GMT ---
I believe this is invalid - here Call[] is a dynamic array of Call, and Call[0]
is a static array of Call, length zero. You can work around this using:
----
alias Template!({ return Call[]; }())  A3;
alias Template!({ return Call[0]; }()) A4;
----

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Denis <verylonglogin.reg gmail.com> changed:

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


--- Comment #2 from Denis <verylonglogin.reg gmail.com> 2011-12-14 17:05:10 MSK
---
Thanks! I'm completely wrong here.

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Denis <verylonglogin.reg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |
            Summary|static opSlice & opIndex    |opSlice() & opIndex
                   |functions don't work as     |functions works unstable as
                   |template arguments          |template arguments


--- Comment #3 from Denis <verylonglogin.reg gmail.com> 2011-12-14 18:06:17 MSK
---
And an easier workaround:
---
alias Template!((Call[]))  A3; // passes
alias Template!((Call[0])) A4; // passes
---
But isn't it strange? Looks like this workaround is a bug. It leads to things
like this:
---
struct S
{
    int opSlice(int, int) const { return 0; }
    int opSlice()         const { return 0; }
    int opIndex(int, int) const { return 0; }
    int opIndex(int)      const { return 0; }
}

enum e = S();

template T(alias a) { } // or T(a...)

alias T!( S ) T0; // passes
alias T!((S)) T1; // passes

alias T!( S()[0..0] )  A0; // passes
alias T!( (e[0..0]) )  A1; // passes
alias T!(  e[0..0]  )  A2; // passes

alias T!( S()[0, 0]  ) B0; // passes
alias T!( (e[0, 0])  ) B1; // passes
alias T!(  e[0, 0]   ) B2; // passes


alias T!( S()[]  ) C0; // passes
alias T!( (e[])  ) C1; // passes
alias T!(  e[]   ) C2; // fails: e is used as a type

alias T!( S()[0] ) D0; // passes
alias T!( (e[0]) ) D1; // passes
alias T!(  e[0]  ) D2; // fails: e must be an array or pointer type, not S
---
And the last error message looks wrong.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid


--- Comment #4 from Kenji Hara <k.hara.pg gmail.com> 2012-03-04 05:00:31 PST ---
https://github.com/D-Programming-Language/dmd/pull/784

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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--- Comment #5 from github-bugzilla puremagic.com 2012-03-09 22:22:48 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/28edc2597a9f1e802e3a2e18353b3038a5307ac5
Merge pull request #784 from 9rnsr/fix7110

Issue 7110 - opSlice() & opIndex functions works unstable as template arguments

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prev sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED


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