http://d.puremagic.com/issues/show_bug.cgi?id=6453

           Summary: Allow multiple invariant per struct/class
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: simendsjo@gmail.com


--- Comment #0 from simendsjo <simendsjo@gmail.com> 2011-08-08 03:19:03 PDT ---
I would like to use a template mixin to add some fields to a struct, but I'd also like the template to add additional invariant checks without having to remember to add this for all struct/classes that mixes in this code.

class C {
    int a;
}

mixin template EmbedC() {
    C _c;

    // oops.. more than one invariant
    invariant() {
        assert(_c);
    }

    void close() {
        _c = null;
    }
}

struct S {
    int i = 10;
    invariant() {
        assert(i >= 10);
    }

    mixin EmbedC!();
}

void main() {
    S s;
    s.close();
    s._c.a = 10; // access violation, but I want assertion from invariant
}

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ddoc
                 CC|                            |yebblies@gmail.com
           Platform|Other                       |All
         AssignedTo|nobody@puremagic.com        |yebblies@gmail.com
         OS/Version|Windows                     |All
           Severity|normal                      |enhancement


--- Comment #1 from yebblies <yebblies@gmail.com> 2012-01-29 15:41:25 EST ---
The spec explicitly states that there can only be one invariant, so this is an enhancement.

On the other hand, this appears to be an arbitrary restriction.

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #2 from yebblies <yebblies@gmail.com> 2012-01-29 17:25:04 EST ---
https://github.com/D-Programming-Language/dmd/pull/653

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Alex Rønne Petersen <xtzgzorex@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xtzgzorex@gmail.com


--- Comment #3 from Alex Rønne Petersen <xtzgzorex@gmail.com> 2012-02-23 12:59:01 PST ---
I completely agree with this change; I ran into this exact limitation for the exact same scenario as well. It's rather crippling for template mixins.

While on this topic, see also bug #5038. It would be a natural extension of this enhancement IMHO.

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ah08010-d@yahoo.com


--- Comment #4 from yebblies <yebblies@gmail.com> 2013-01-17 01:28:15 EST ---
*** Issue 5038 has been marked as a duplicate of this issue. ***

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--- Comment #5 from github-bugzilla@puremagic.com 2013-05-12 19:17:40 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/ae70bfdeafd3a534e3f12747503bafa046be2f9d fix Issue 6453 - Allow multiple invariant per struct/class

https://github.com/D-Programming-Language/dmd/commit/081c92a115b3006871c5a516267417e06ceacbcf Merge pull request #1978 from 9rnsr/multi_inv

Issue 6453 - Allow multiple invariant per struct/class

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--- Comment #6 from github-bugzilla@puremagic.com 2013-05-12 21:34:21 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/ce58435fe322afd736504f804bdad6a9debb8c1d Fix up for issue 6453 change, allow shared/synchronized invariants

But mixing non-shared/shared/synchronized is currently rejected.

https://github.com/D-Programming-Language/dmd/commit/4fbc77fa504c2d8ee4c7ef10edc70221a74742c3 Merge pull request #2028 from 9rnsr/multi_inv

Fix up for issue 6453 change, allow shared/synchronized invariants

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

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


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