Shows that the order in which constructor of classes with multiple inheritance is defined by the declaration in the header file.

cpp_multiple_inheritance_constructor_order.cpp

#include <iostream>

using namespace std;

class BaseClass1
{
public:
    BaseClass1()
    {
        cout << "Base class 1 constructor" << endl;
    }

    BaseClass1(int param)
    {
        cout << "Base class 1 constructor with param" << endl;
    }
};

class BaseClass2
{
public:
    BaseClass2()
    {
        cout << "Base class 2 constructor" << endl;
    }
};

class DerivedClass : public BaseClass2, public BaseClass1
{
public:
    DerivedClass() :
        BaseClass1(10),
        BaseClass2()
    {
        cout << "Derived class constructor" << endl;
    }
};

int main()
{
    DerivedClass dc;
    return 0;
}