multiple-inheritance

I have tried to find a lot that what if only one class is made virtual in multiple inheritance ? The behaviour of constructor call is not clear to me in this case. Let say for example code- #include<iostream> using namespace std; class grand{ public: grand(){cout<<"grandfather"<<endl;} }; class parent1:virtual public grand{ //virtual used only here public: parent1(){cout<<"parent1 "<<endl;} }; class parent2: public grand{ public: parent2(){cout<<"parent2"<<endl;} }; class child:public parent1,public parent2{ public: child(){cout<<"child"<<endl;} }; int main() { child s; return 0; } The output

I'm not exactly sure the terminology to use, but here's my example: class Base { public: virtual void test() = 0; }; class Mixin { public: virtual void test() { } }; class Example : public Base, public Mixin { }; int main(int argc, char** argv) { Example example; example.test(); return 0; } I want my Mixin class to implement the pure virtual function Base::test , but when I compile this, it says: test.cpp: In function ‘int main(int, char**)’: test.cpp:15:13: error: cannot declare variable ‘example’ to be of abstract type ‘Example’ Example example; ^ test.cpp:11:7: note: because the following

As I am working as a C# developer, I know that we can implement multiple inheritance by use of Interface . Can anybody please provide me link OR code for how to achieve multiple inheritance with C# . I want code for how to achieve multiple inheritance in C# with the use of Interface . Thanks in advance. Here is a good example. http://blog.vuscode.com/malovicn/archive/2006/10/20/How-to-do-multiple-inheritance-in-C_2300_- 2D00 -Implementation-over-delegation-_2800_IOD_2900_.aspx A quick code preview: interface ICustomerCollection { void Add(string customerName); void Delete(string customerName);

I'm reading this article " Virtual method table " Example in the above article: class B1 { public: void f0() {} virtual void f1() {} int int_in_b1; }; class B2 { public: virtual void f2() {} int int_in_b2; }; class D : public B1, public B2 { public: void d() {} void f2() {} // override B2::f2() int int_in_d; }; B2 *b2 = new B2(); D *d = new D(); In the article, the author introduces that the memory layout of object d is like this: d: D* d--> +0: pointer to virtual method table of D (for B1) +4: value of int_in_b1 B2* b2--> +8: pointer to virtual method table of D (for B2) +12: value of int_in

This seems like a reasonable (and maybe simple?) scenario, but how would you do the following: Lets say I have 2 interfaces: Interface ISimpleInterface string ErrorMsg { get; } End Interface Interface IExtendedInterface string ErrorMsg { get; set; } string SomeOtherProperty { get; set; } End Interface I want a class to implement both interfaces: Public Class Foo Implements ISimpleInterface, IExtendedInterface How do I define the ErrorMsg property in the class given that each interface has a different access level? Here is my scenario in case you are wondering: I am writing a UserControl using

Consider the code below: trait A { def work = { "x" } } trait B { def work = { 1 } } class C extends A with B { override def work = super[A].work } Class C won't compile in scala 2.10, because of "overriding method work in trait A of type => String; method work has incompatible type". How to choose one specific method? I'm afraid there is no way to do that. The super[A].work way works only if A and B have the same return types. Consider this: class D extends B .... val test: List[B] = List(new C(), new D()) test.map(b => b.work) //oops - C returns a String, D returns an Int Scala simply

The following code: struct interface_base { virtual void foo() = 0; }; struct interface : public interface_base { virtual void bar() = 0; }; struct implementation_base : public interface_base { void foo(); }; struct implementation : public implementation_base, public interface { void bar(); }; int main() { implementation x; } fails to compile with the following errors: test.cpp: In function 'int main()': test.cpp:23:20: error: cannot declare variable 'x' to be of abstract type 'implementation' test.cpp:16:8: note: because the following virtual functions are pure within 'implementation': test