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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file smallmap_type.hpp Simple mapping class targeted for small sets of data. Stored data shall be POD ("Plain Old Data")! */
#ifndef SMALLMAP_TYPE_HPP
#define SMALLMAP_TYPE_HPP
#include "smallvec_type.hpp"
#include <utility>
/**
* Implementation of simple mapping class.
* It has inherited accessors from std::vector().
* @tparam T Key type.
* @tparam U Value type.
* @tparam S Unit of allocation.
*
* @see std::vector
*/
template <typename T, typename U>
struct SmallMap : std::vector<std::pair<T, U> > {
typedef std::pair<T, U> Pair;
typedef Pair *iterator;
typedef const Pair *const_iterator;
/** Creates new SmallMap. Data are initialized in std::vector constructor */
inline SmallMap() { }
/** Data are freed in std::vector destructor */
inline ~SmallMap() { }
/**
* Finds given key in this map
* @param key key to find
* @return &Pair(key, data) if found, this->End() if not
*/
inline typename std::vector<Pair>::const_iterator Find(const T &key) const
{
typename std::vector<Pair>::const_iterator it;
for (it = std::vector<Pair>::begin(); it != std::vector<Pair>::end(); it++) {
if (key == it->first) return it;
}
return it;
}
/**
* Finds given key in this map
* @param key key to find
* @return &Pair(key, data) if found, this->End() if not
*/
inline Pair *Find(const T &key)
{
for (uint i = 0; i < std::vector<Pair>::size(); i++) {
if (key == std::vector<Pair>::operator[](i).first) return &std::vector<Pair>::operator[](i);
}
return this->End();
}
inline const Pair *End() const
{
return std::vector<Pair>::data() + std::vector<Pair>::size();
}
inline Pair *End()
{
return std::vector<Pair>::data() + std::vector<Pair>::size();
}
/**
* Tests whether a key is assigned in this map.
* @param key key to test
* @return true iff the item is present
*/
inline bool Contains(const T &key) const
{
return this->Find(key) != std::vector<Pair>::end();
}
/**
* Tests whether a key is assigned in this map.
* @param key key to test
* @return true iff the item is present
*/
inline bool Contains(const T &key)
{
return this->Find(key) != this->End();
}
/**
* Removes given pair from this map
* @param pair pair to remove
* @note it has to be pointer to pair in this map. It is overwritten by the last item.
*/
inline void Erase(Pair *pair)
{
assert(pair >= std::vector<Pair>::data() && pair < this->End());
auto distance = pair - std::vector<Pair>::data();
std::vector<Pair>::erase(std::vector<Pair>::begin() + distance);
}
/**
* Removes given key from this map
* @param key key to remove
* @return true iff the key was found
* @note last item is moved to its place, so don't increase your iterator if true is returned!
*/
inline bool Erase(const T &key)
{
auto *pair = this->Find(key);
if (pair == this->End()) return false;
this->Erase(pair);
return true;
}
/**
* Adds new item to this map.
* @param key key
* @param data data
* @return true iff the key wasn't already present
*/
inline bool Insert(const T &key, const U &data)
{
if (this->Contains(key)) return false;
std::vector<Pair>::emplace_back(key, data);
return true;
}
/**
* Returns data belonging to this key
* @param key key
* @return data belonging to this key
* @note if this key wasn't present, new entry is created
*/
inline U &operator[](const T &key)
{
for (uint i = 0; i < std::vector<Pair>::size(); i++) {
if (key == std::vector<Pair>::operator[](i).first) return std::vector<Pair>::operator[](i).second;
}
Pair &n = std::vector<Pair>::emplace_back();
n.first = key;
return n.second;
}
};
#endif /* SMALLMAP_TYPE_HPP */
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