C / C++ / MFC

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Peter Weyzen<br />
Staff Engineer<br />
Santa Cruz Networks

<br />
// base class<br />
class A<br />
{<br />
private:<br />
    int n;<br />
public:<br />
    A();<br />
    int GetInt();<br />
};<br />
A::A()<br />
{ n = 1; }<br />
int A::GetInt()<br />
{ return n; }<br />
<br />
// derived class<br />
class B : public A<br />
{<br />
private:<br />
    double b;<br />
public:<br />
    B();<br />
    double GetDouble();<br />
}<br />
<br />
// You can call a inherited constructor in 2 ways:<br />
// 1) this method doesn't work with other functions, only the constructor!!<br />
B::B() : A()<br />
{<br />
  // The first thing that is done, is the call to A(), afterwards this code <br />
  // is executed<br />
  d = 1.1;  <br />
}<br />
<br />
// 2) this method works with all types of functions<br />
B::B()<br />
{<br />
   d = 1.1;<br />
   A::A(); // 'A::' is the C++ version of 'super'<br />
           // this is just a normal function call, and can be placed<br />
           // anywhere, where a statement would be legal!<br />
}<br />