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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 "sort_func.hpp"
/** Simple pair of data. Both types have to be POD ("Plain Old Data")! */
template <typename T, typename U>
struct SmallPair {
T first;
U second;
/** Initializes this Pair with data */
FORCEINLINE SmallPair(const T &first, const U &second) : first(first), second(second) { }
};
/** Implementation of simple mapping class. Both types have to be POD ("Plain Old Data")!
* It has inherited accessors from SmallVector().
* @see SmallVector
*/
template <typename T, typename U, uint S = 16>
struct SmallMap : SmallVector<SmallPair<T, U>, S> {
typedef ::SmallPair<T, U> Pair;
typedef Pair *iterator;
typedef const Pair *const_iterator;
/** Creates new SmallMap. Data are initialized in SmallVector constructor */
FORCEINLINE SmallMap() { }
/** Data are freed in SmallVector destructor */
FORCEINLINE ~SmallMap() { }
/** Finds given key in this map
* @param key key to find
* @return &Pair(key, data) if found, this->End() if not
*/
FORCEINLINE Pair *Find(const T &key)
{
for (uint i = 0; i < this->items; i++) {
if (key == this->data[i].first) return &this->data[i];
}
return 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.
*/
FORCEINLINE void Erase(Pair *pair)
{
assert(pair >= this->Begin() && pair < this->End());
*pair = this->data[--this->items];
}
/** 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!
*/
FORCEINLINE bool Erase(const T &key)
{
for (uint i = 0; i < this->items; i++) {
if (key == this->data[i].first) {
this->data[i] = this->data[--this->items];
return true;
}
}
return false;
}
/** Adds new item to this map.
* @param key key
* @param data data
* @return true iff the key wasn't already present
*/
FORCEINLINE bool Insert(const T &key, const U &data)
{
if (this->Find(key) != this->End()) return false;
new (this->Append()) Pair(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
*/
FORCEINLINE U &operator[](const T &key)
{
for (uint i = 0; i < this->items; i++) {
if (key == this->data[i].first) return this->data[i].second;
}
Pair *n = this->Append();
n->first = key;
return n->second;
}
FORCEINLINE void SortByKey()
{
QSortT(this->Begin(), this->items, KeySorter);
}
static int CDECL KeySorter(const Pair *a, const Pair *b)
{
return a->first - b->first;
}
};
#endif /* SMALLMAP_TYPE_HPP */
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