The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include "geogroup.hpp"
#include <algorithm>
namespace Geo {
/* add
* - insert element
*/
void GeoGroup::add(GeoObj& obj)
{
// keep address of the passed geometric object
elems.push_back(&obj);
}
/* draw
* - draw all elements, taking the reference points into account
*/
void GeoGroup::draw() const
{
for (unsigned i=0; i<elems.size(); ++i) {
elems[i]->move(refpoint); // add offset for the reference point
elems[i]->draw(); // draw element
elems[i]->move(-refpoint); // subtract offset
}
}
/* remove
* - delete element
*/
bool GeoGroup::remove(GeoObj& obj)
{
// find first element with this address and remove it
// return whether an object was found and removed
std::vector<GeoObj*>::iterator pos;
pos = std::find(elems.begin(),elems.end(),&obj);
if (pos != elems.end()) {
elems.erase(pos);
return true;
}
else {
return false;
}
}
} // namespace Geo