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#include <map>
#include <algorithm>
#include <functional>
#include <iterator>
/*
// SF:
// template <typename Key, typename Value>
// class Dictionary;
//
// template <typename Key, typename Value>
// Dictionary<Key, Value>
// subset(Key const &key, Dictionary<Key, Value> const &dict);
//FUNCTION
template <typename Key, typename Value>
class Dictionary
{
friend Dictionary<Key, Value>
subset<Key, Value>(Key const &key,
Dictionary<Key, Value> const &dict);
std::map<Key, Value> d_dict;
public:
Dictionary();
};
template <typename Key, typename Value>
Dictionary<Key, Value>
subset(Key const &key, Dictionary<Key, Value> const &dict)
{
Dictionary<Key, Value> ret;
std::remove_copy_if(dict.d_dict.begin(), dict.d_dict.end(),
std::inserter(ret.d_dict, ret.d_dict.begin()),
std::bind2nd(std::equal_to<Key>(), key));
return ret;
}
//=
*/
//CLASS1
template <typename Key, typename Value>
class Iterator;
template <typename Key, typename Value>
class Dictionary
{
friend class Iterator<Key, Value>;
//=
std::map<Key, Value> d_dict;
public:
Dictionary();
// uses the friend's constructor
template <typename Key2, typename Value2>
Iterator<Key2, Value2> begin();
template <typename Key2, typename Value2>
Iterator<Key2, Value2> // uses a member function
subset(Key const &key);
};
//CLASS2
template <typename Key, typename Value>
template <typename Key2, typename Value2>
Iterator<Key2, Value2> Dictionary<Key, Value>::begin()
{
return Iterator<Key, Value>(*this);
}
template <typename Key, typename Value>
template <typename Key2, typename Value2>
Iterator<Key2, Value2> Dictionary<Key, Value>::subset(Key const &key)
{
return Iterator<Key, Value>(*this).subset(key);
}
//=
/*
//CLASS3
template <typename Key, typename Value>
class Iterator
{
std::map<Key, Value> &d_dict;
public:
Iterator(Dictionary<Key, Value> &dict)
:
d_dict(dict.d_dict)
{}
//=
*/
//CLASS3a
template <typename Key, typename Value>
class Iterator
{
friend Dictionary<Key, Value>::Dictionary();
std::map<Key, Value> &d_dict;
Iterator(Dictionary<Key, Value> &dict);
public:
//=
typename std::map<Key, Value>::iterator begin();
typename std::map<Key, Value>::iterator subset(Key const &key);
};
//CLASS4
template <typename Key, typename Value>
typename std::map<Key, Value>::iterator Iterator<Key, Value>::begin()
{
return d_dict.begin();
}
//=
template <typename Key, typename Value>
Iterator<Key, Value>::Iterator(Dictionary<Key, Value> &dict)
:
d_dict(dict.d_dict)
{}
template <typename Key, typename Value>
typename std::map<Key, Value>::iterator
Iterator<Key, Value>::subset(Key const &key)
{
return d_dict.begin();
}
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