Bug 11796 – interface multiple inheritance not call methods

Created attachment 1302 [email protected](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

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 } -----

(In reply to comment #1) > 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) } -----

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.

(In reply to Andrej Mitrovic from comment #2) > sub.func1(); // triggers assertion (func2 called) It's translated to (cast(I1)sub).func1() and a dynamic cast from I4 to I1 occurs to take the vtbl of I1. Then the issue 2013 happens. *** This issue has been marked as a duplicate of issue 2013 ***