这些名称冲突如何在C ++中解决？

/
  +-- conflicttest
  |     +-- A.cpp
  |     +-- A.h
  |     +-- main.cpp
  +-- libconflict
  |     +-- conflict
  |     |     +-- A.h
  |     |     +-- B.h
  |     +-- A.cpp
  |     +-- B.cpp

// libconflict B.h
class B
{
public:
    void bar();
protected:
    int j_;
};

// libconflict B.cpp
#include \"conflict/B.h\"

void B::bar()
{
    std::cout << \"B::bar\" << std::endl;
}

// libconflict A.h
# include \"conflict/B.h\"

class A : public B
{
public:
    A();
private:
    int i_;
};

#include \"conflict/A.h\"

A::A()
{
    std::cout << \"libconflict A is alive\" << std::endl;
    i_ = 51; // some random fields and values... I should admit I am lost
    j_ = 47;
}

// conflicttest A.h
class A
{
public:
    A();
    void foo();
};

// conflicttest A.cpp
#include \"A.h\"

A::A()
{
    std::cout << \"A is alive\" << std::endl;
}

void A::foo()
{
    std::cout << \"A::foo\" << std::endl;
}

main.cpp

// main.cpp in conflicttest
#include \"conflict/A.h\"

int main()
{
    B* b = new A;
    b->bar();
return 0;
}

conflicttest

libconflict

A is alive
B::bar

A

B::bar()