pointainer.h

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/*
 * pointainer - auto-cleaning container of pointers
 *
 * Example usage:
 * {
 *     pointainer< std::vector<int*> > v;
 *     // v can be manipulated like any std::vector<int*>.
 *
 *     v.push_back(new int(42));
 *     v.push_back(new int(17));
 *     // v now owns the allocated int-s
 *
 *     v.erase(v.begin());
 *     // frees the memory allocated for the int 42, and then removes the
 *     // first element of v.
 * }
 * // v's destructor is called, and it frees the memory allocated for
 * // the int 17.
 *
 * Notes:
 * 1. Assumes all elements are unique (you don't have two elements
 *    pointing to the same object, otherwise you might delete it twice).
 * 2. Not usable with pair associative containers (map and multimap).
 * 3. For ANSI-challenged compilers, you may want to #define
 *    NO_MEMBER_TEMPLATES.
 *
 * Written 10-Jan-1999 by Yonat Sharon <[e-mail]>
 * Last updated 07-Feb-1999
 */

#ifndef POINTAINER_H
#define POINTAINER_H

#ifdef NO_MEMBER_TEMPLATES
#include <functional> // for binder2nd
#endif

template <typename Cnt>
class pointainer : public Cnt
{
public:
    typedef typename Cnt::size_type size_type;
    typedef typename Cnt::difference_type difference_type;
    typedef typename Cnt::reference reference;
    typedef typename Cnt::const_reference const_reference;
    typedef typename Cnt::value_type value_type;
    typedef typename Cnt::iterator iterator;
    typedef typename Cnt::const_iterator const_iterator;
    typedef typename Cnt::reverse_iterator reverse_iterator;
    typedef typename Cnt::const_reverse_iterator const_reverse_iterator;
    typedef pointainer<Cnt> its_type;

    pointainer()                            {}
	pointainer(size_type n) : Cnt(n)   {}
    pointainer(const Cnt& c)                : Cnt(c) {}
    its_type& operator=(const Cnt& c)       {Cnt::operator=(c); return *this;}
    ~pointainer()                           {clean_all();}

    void clear()                            {clean_all(); Cnt::clear();}
    iterator erase(iterator i)              {clean(i); return Cnt::erase(i);}
    iterator erase(iterator f, iterator l)  {clean(f,l); return Cnt::erase(f,l);}

    // for associative containers: erase() a value
    size_type erase(const value_type& v)
    {
        iterator i = find(v);
        size_type found(i != end()); // can't have more than 1
        if (found)
            erase(i);
        return found;
    }

    // for sequence containers: pop_front(), pop_back(), resize() and assign()
    void pop_front()    {clean(begin()); Cnt::pop_front();}
    void pop_back()     {iterator i(end()); clean(--i); Cnt::pop_back();}
    void resize(size_type s, value_type c = value_type())
    {
        if (s < size())
            clean(begin()+s, end());
        Cnt::resize(s, c);
    }
#ifndef NO_MEMBER_TEMPLATES
    template <class InIter> void assign(InIter f, InIter l)
#else
    void assign(iterator f, iterator l)
#endif
    {
        clean_all();
        Cnt::assign(f,l);
    }
#ifndef NO_MEMBER_TEMPLATES
    template <class Size, class T> void assign(Size n, const T& t = T())
#else
    void assign(size_t n, const value_type& t = value_type())
#endif
    {
        clean_all();
        Cnt::assign(n,t);
    }
    
    // for std::list: remove() and remove_if()
    void remove(const value_type& v)
    {
        clean( std::find(begin(), end(), v) );
        Cnt::remove(v);
    }
#ifndef NO_MEMBER_TEMPLATES
    template <class Pred>
#else
    typedef std::binder2nd<std::not_equal_to<value_type> > Pred;
#endif
    void remove_if(Pred pr)
    {
        for (iterator i = begin(); i != end(); ++i)
            if (pr(*i))
                clean(i);
        Cnt::remove_if(pr);
    }

	void swap(its_type& other)
	{
		Cnt::swap(other);
	}

private:
    void clean(iterator i)                  
	{
		delete *i;
	}
    void clean(iterator f, iterator l)      {while (f != l) clean(f++);}
    void clean_all()                        {clean( begin(), end() );}

    // we can't have two pointainers own the same objects:
    pointainer(const its_type&) {}
    its_type& operator=(const its_type&) {}
};

#endif // POINTAINER_H