From 2e2086f3f884487b4f456bd4b4c1e21f96987b59 Mon Sep 17 00:00:00 2001
From: smatz <smatz@openttd.org>
Date: Fri, 26 Dec 2008 13:50:46 +0000
Subject: (svn r14742) -Codechange: use SmallMap in two cases to reduce
 compilation time and binary size

---
 src/core/smallmap_type.hpp | 101 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/core/smallmap_type.hpp

(limited to 'src/core')

diff --git a/src/core/smallmap_type.hpp b/src/core/smallmap_type.hpp
new file mode 100644
index 000000000..681cacdff
--- /dev/null
+++ b/src/core/smallmap_type.hpp
@@ -0,0 +1,101 @@
+/* $Id$ */
+
+/** @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"
+
+/** 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;
+
+	/** 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
+	 * @return true iff key was found
+	 * @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 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 kay 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;
+	}
+};
+
+#endif /* SMALLMAP_TYPE_HPP */
-- 
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