Possible Duplicate:
How do you declare an interface in C++?
Somebody asked me a qustion: "In C++ there are no interfaces like in java. But event then you could realize them in c++, how would you do that?"
How? I would make a class with virtual methods. That would be look like an interface as in java or?
Thank you
You can create interfaces in C++ using multiple inheritance.
You create a base class which is pure virtual (all functions =0) and then your classes inherit from this.
Multiple inheritance means you can inherit from as many of these as you like.
// Interface definition
class ISomethingable
{
public:
virtual ~ISomethingable() {}
virtual void DoSomething() = 0;
}
// Your code
class MyClass : public ISomethingable
{
public:
void DoSomething()
{
// Do something concrete.
}
}
See also: How do you declare an interface in C++?
Yeah, just make a class with no member variables and pure virtual functions.
An interface in C++ would be an abstract base class -- one that can't be instantiated from. Unlike java interfaces, they can actually have partial implementation and member variables.
