namespace designpattern_composite
{
class component
{
public:
virtual void operation() = 0 ;
virtual void add(component*) {}
} ;

class abstractcomponent1 : virtual public component {} ;

class abstractleaf1 : virtual public abstractcomponent1 {} ;

class composite1 : public abstractcomponent1
{
public:
virtual void operation() { /* do operation */ }
virtual void add(component*) ;
} ;
void composite1::add(component *p)
{
abstractcomponent1 *pc1 = dynamic_cast＜abstractcomponent1*＞(p) ;
if (pc1 == null) return ;
// do add operation
}

class abstractcomponent2 : virtual public component {} ;

class abstractleaf2 : virtual public abstractcomponent2 {} ;

class composite2 : public abstractcomponent2
{
public:
virtual void operation() { /* do operation */ }
virtual void add(component*) ;
} ;
void composite2::add(component *p)
{
abstractcomponent2 *pc2 = dynamic_cast＜abstractcomponent2*>(p) ;
if (pc2 == null) return ;
// do add operation
}

class concreteleaf1 : public abstractleaf1
{
public:
virtual void operation() { /* do operation */ }
} ;

class concreteleaf2 : public abstractleaf1, public abstractleaf2
{
public:
virtual void operation() { /* do operation */ }
} ;
}

客户端代码：
｛
using namespace designpattern_composite ;

component *pc1 = new concreteleaf1() ;
component *pc2 = new concreteleaf2() ;
component *pc3 = new composite1() ;
component *pc4 = new composite2() ;
pc3->add(pc1) ; // ok
pc3->add(pc2) ; // ok
pc3->add(pc3) ; // ok
pc3->add(pc4) ; // fail
pc4->add(pc1) ; // fail
pc4->add(pc2) ; // ok
pc4->add(pc3) ; // fail
pc4->add(pc4) ; // ok
}

namespace designpattern_composite
{
// class component
class component
{
public:
virtual void operation() = 0 ;
virtual void add(component*) {}
} ;

// class leaf
class leaf : public component
{
public:
virtual void operation() {}
} ;

// class composite
class composite : public component
{
public:
virtual void add(component *p) { _list.push_back(p) ; }
virtual void operation()
{
vector< component* >::const_iterator it ;
for (it = _list.begin(); it != _list.end(); it++)
(*it)->operation() ;
}
private:
vector< component* > _list ;
} ;
}