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// shapeList.h
// Definition of classes ShapePtr and ShapePtrList
// inhomogeneous list for Shape-Objects
#ifndef SHAPELIST_H
#define SHAPELIST_H
#include <iostream>
using std::cerr;
using std::left;
#include <cstdlib> // exit()
#include <list> // class-Template list< T >
// T is type of list elements
#include "shape.h"
class ShapePtr
{
private:
Shape* ptr;
public:
ShapePtr( Shape* p = NULL ) : ptr( p ) { } // constructors
ShapePtr( const ShapePtr& sp ) { ptr = sp->clone(); }
~ShapePtr() { delete ptr; } // destructor
ShapePtr& operator=( Shape* p ) // assignments
{
delete ptr;
ptr = p->clone();
return *this;
}
ShapePtr& operator=( ShapePtr& a )
{
delete ptr;
ptr = a->clone();
return *this;
}
Shape& operator*() const // dereferencing
{
if( !ptr ) {
cerr << "ShapePtr::operator* : Kein Objekt!" << endl;
exit( 100 );
}
return *ptr;
}
Shape* operator->() const // member selection via pointer
{
if( !ptr ) {
cerr << "ShapePtr::operator-> : Kein Objekt!" << endl;
exit( 101 );
}
return ptr;
}
operator Shape*() const { return ptr; } // cast
};
class ShapePtrList : public std::list< ShapePtr >
{
public:
void scale( double scalingFactor )
{
ShapePtrList::iterator pos;
for( pos = begin(); pos != end(); ++pos )
( *pos )->scale( scalingFactor );
}
string toString() const
{
stringstream sstream;
if( empty() )
sstream << "Die Liste ist leer!";
else {
ShapePtrList::const_iterator pos;
for( pos = begin(); pos != end(); ++pos ) {
sstream.width( 20 );
sstream << left << typeid( **pos ).name();
sstream << ( *pos )->toString() << endl;
}
}
return sstream.str();
}
};
#endif
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