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class noncopyable
{
protected:
    noncopyable() {};
    ~noncopyable() {};
private:
    noncopyable (const noncopyable&);
    const noncopyable& operator= (const noncopyable&);
};
 
class Root
{
};
 
class Fixture
:
    public noncopyable
{
public:
    Fixture (Root& root)
    :
        mRoot (root)
    {
    }
private:
    Root& mRoot;
};
 
class Branch
:
    public Root,
    public Fixture
{
public:
    Branch()
    :
        Fixture (*this)
    {
    }
};
 
int main()
{
    Branch branch;
}

prog.cpp: In constructor ‘Branch::Branch()’:
prog.cpp:37:23: error: call of overloaded ‘Fixture(Branch&)’ is ambiguous
prog.cpp:37:23: note: candidates are:
prog.cpp:20:5: note: Fixture::Fixture(Root&)
prog.cpp:15:7: note: Fixture::Fixture(const Fixture&)

Standard output is empty