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digitalmars.D.bugs - [Issue 11796] New: interface multiple inheritance not call methods

reply d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11796

           Summary: interface multiple inheritance not call methods
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: code.viator gmail.com



Created an attachment (id=1302)
core.exception.AssertError bug2.d(38): funcA not called

In situation with multiple inheritance in realization, like in attachment,
there is a problem: functions (funcA) of the first interface (IFaceA) isn't
callable, of which inherited the intermediate interface (IFaceA1)

compiler: DMD64 D Compiler v2.064-devel-37e15ab
OS: Linux 3.11.6-200.fc19.x86_64

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Dec 21 2013
next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11796


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich gmail.com



01:12:16 PST ---
Reduced:

-----
interface I1 { void func1(); }
interface I2 { void func2(); }

interface I3 : I1 { }
interface I4 : I2, I3 { }

class Test : I4
{
    void func1() { check = true; }
    void func2() { }
    bool check;
}

void main()
{
    I4 sub = new Test;
    sub.func1();
    assert((cast(Test)sub).check);  // fails
}
-----

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Dec 22 2013
prev sibling next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11796




01:13:38 PST ---


 Reduced:


What's worrying is that func2() ends up being called:

-----
interface I1 { void func1(); }
interface I2 { void func2(); }

interface I3 : I1 { }
interface I4 : I2, I3 { }

import std.stdio;

class Test : I4
{
    void func1() { check = true; }
    void func2() { assert(0); }
    bool check;
}

void main()
{
    I4 sub = new Test;
    sub.func1();  // triggers assertion (func2 called)
}
-----

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Dec 22 2013
prev sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11796


Maxim Fomin <maxim maxim-fomin.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |maxim maxim-fomin.ru



---
Note, if order of interfaces in derivative list is changed, program runs fine.

interface I4 : I2, I3 { } => interface I4 : I3, I2 { }

Perhaps compiler puts func2() before func1() in vitrual table, after reading
Test class definition assumes that func1() is placed before func2(), so the
second function is called.

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