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POdiamond shaped multiple inheritance pattern
 

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    <p>Below is a diamond problem faced in multiple inheritance, </p> <pre><code>class Base { public: Base() { cout &lt;&lt; "Empty Base constructor " &lt;&lt; endl; } Base(const string &amp; strVar) { m_strVar = strVar; cout &lt;&lt; m_strVar &lt;&lt; endl; } virtual ~Base() { cout &lt;&lt; "Empty Base destructor " &lt;&lt; endl; } virtual const string &amp; strVar() const { return m_strVar; } string m_strVar; }; class Derived1: public virtual Base { public: Derived1() { cout &lt;&lt; "Empty Derived1 constructor " &lt;&lt; endl; } Derived1(const string &amp; strVar) : Base(strVar) { cout &lt;&lt; " Derived1 one arg constructor" &lt;&lt; endl; } ~Derived1() { cout &lt;&lt; "Empty Derived1 destructor " &lt;&lt; endl; } }; class Derived2: public virtual Base { public: Derived2() { cout &lt;&lt; "Empty Derived2 constructor " &lt;&lt; endl; } Derived2(const string &amp; strVar) : Base(strVar) { cout &lt;&lt; "Derived2 one arg constructor" &lt;&lt; endl; } ~Derived2() { cout &lt;&lt; "Empty Derived2 destructor " &lt;&lt; endl; } }; class Derived: public Derived1, public Derived2 { public: Derived(const string &amp; strVar) : Derived1(strVar), Derived2(strVar) { cout &lt;&lt; "Derived Constructor " &lt;&lt; endl; } ~Derived() { cout &lt;&lt; "Empty Derived destructor " &lt;&lt; endl; } }; int main() { Derived derObj ("Print this if you can ! "); } </code></pre> <p>the output i get is </p> <ol> <li>Empty Base constructor</li> <li>Derived2 one arg constructor</li> <li>Derived1 one arg constructor</li> <li>Derived Constructor</li> <li>Empty Derived destructor</li> <li>Empty Derived2 destructor</li> <li>Empty Derived1 destructor</li> <li>Empty Base destructor</li> </ol> <p>i wonder why my derObj parameter i.e "Print this if you can" is not printed and output is not like</p> <ol> <li>Empty Base constructor</li> <li>Derived2 one arg constructor</li> <li>Print this if you can!</li> <li>Derived1 one arg constructor</li> <li>Derived Constructor</li> <li>Empty Derived destructor</li> <li>Empty Derived2 destructor</li> <li>Empty Derived1 destructor</li> <li>Empty Base destructor</li> </ol>
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