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pointer_holder.cc

#include <qpdf/PointerHolder.hh>

#include <iostream>
#include <stdlib.h>
#include <list>

#include <qpdf/QUtil.hh>

class Object
{
  public:
    Object();
    ~Object();
    void hello();

  private:
    static int next_id;
    int id;
};


int Object::next_id = 0;

Object::Object()
{
    this->id = ++next_id;
    std::cout << "created Object, id " << this->id << std::endl;
}

Object::~Object()
{
    std::cout << "destroyed Object, id " << this->id << std::endl;
}

void
Object::hello()
{
    std::cout << "calling Object::hello for " << this->id << std::endl;
}

typedef PointerHolder<Object> ObjectHolder;

int main(int argc, char* argv[])
{
    std::list<ObjectHolder> ol1;

    ObjectHolder oh0;
    {
      std::cout << "hello" << std::endl;
      Object* o1 = new Object;
      ObjectHolder oh1(o1);
      ObjectHolder oh2(oh1);
      ObjectHolder oh3(new Object);
      ObjectHolder oh4;
      ObjectHolder oh5;
      if (oh4 == oh5)
      {
          std::cout << "nulls equal" << std::endl;
      }
      oh3 = oh1;
      oh4 = oh2;
      if (oh3 == oh4)
      {
          std::cout << "equal okay" << std::endl;
      }
      if ((! (oh3 < oh4)) && (! (oh4 < oh3)))
      {
          std::cout << "less than okay" << std::endl;
      }
      ol1.push_back(oh3);
      ol1.push_back(oh3);
      Object* o3 = new Object;
      oh0 = o3;
    }

    ol1.front().getPointer()->hello();
    ol1.pop_front();
    std::cout << "goodbye" << std::endl;
    return 0;
}

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