Interface Inheritance with C++ Headers

[quic-dperezzo]

When using inheritance in an IDL, idlc produces incorrect C++ headers for chained inheritance. Please see the below example.

// example/example.idl
interface A {
};

interface B: A {
};

interface C: B {
};

The compiled idl results in this class for interface C:

class IA {}; // base class
class IB : public IA {}; // B inherits from A
class IC : public IB IA {}; // C inherits from B(which inherits A) and A without a comma?

This gives the compiler error:

In file included from main.cpp:2:
./example.hpp:54:21: error: expected '{' after base class list
class IC : public IB IA {
                    ^

The compiled idl should return this instead.

class IA {}; // base class
class IB : public IA {}; // B inherits from A
class IC : public IB {}; // C inherits from B(which inherits A)

See this example:
inheritance.zip