From 71844dd2056e72bc1b82570e4754cbeeac4de344 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Thu, 26 Jul 2007 05:52:09 +0000
Subject: Added Raul::Table class (like an std::map but in an array, very fast
 to do a sorted iteration). Fixed unit test building.

git-svn-id: http://svn.drobilla.net/lad/raul@629 a436a847-0d15-0410-975c-d299462d15a1
---
 raul/TableImpl.hpp | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 raul/TableImpl.hpp

(limited to 'raul/TableImpl.hpp')

diff --git a/raul/TableImpl.hpp b/raul/TableImpl.hpp
new file mode 100644
index 0000000..bac948e
--- /dev/null
+++ b/raul/TableImpl.hpp
@@ -0,0 +1,166 @@
+/* This file is part of Raul.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Raul 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; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Raul 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <cassert>
+#include <stdexcept>
+#include <algorithm>
+#include <iostream>
+#include <raul/Table.hpp>
+
+namespace Raul {
+
+#ifndef NDEBUG
+template <typename K, typename T>
+bool
+Table<K,T>::is_sorted() const
+{
+	if (_size <= 1)
+		return true;
+	
+	K prev_key = _array[0].first;
+
+	for (size_t i=1; i < _size; ++i)
+		if (_array[i].first < prev_key)
+			return false;
+		else
+			prev_key = _array[i].first;
+	
+	return true;
+}
+#endif
+
+
+/** Binary search (O(log(n))) */
+template <typename K, typename T>
+typename Table<K,T>::iterator
+Table<K,T>::find(const K& key)
+{
+	if (_size == 0)
+		return end();
+
+	size_t lower = 0;
+	size_t upper = _size - 1;
+	size_t i;
+	
+	while (upper >= lower) {
+		i = lower + ((upper - lower) / 2);
+		Entry& elem = _array[i];
+
+		if (elem.first == key)
+			return iterator(*this, i);
+		else if (i < _size-1 && elem.first < key)
+			lower = i + 1;
+		else if (i > 0)
+			upper = i - 1;
+		else
+			break;
+	}
+	
+	return end();
+}
+
+
+template <typename K, typename T>
+void
+Table<K,T>::insert(K key, T value)
+{
+	Entry new_entry = make_pair(key, value);
+
+	if (_size == 0) {
+		_array = (std::pair<K, T>*)malloc(sizeof(Entry) * 2);
+		_array[0] = new_entry;
+		++_size;
+		return;
+	} else if (_size == 1) {
+		if (key > _array[0].first) {
+			_array[1] = new_entry;
+		} else {
+			_array[1] = _array[0];
+			_array[0] = new_entry;
+		}
+		++_size;
+		return;
+	}
+
+	size_t lower = 0;
+	size_t upper = _size - 1;
+	size_t i;
+	
+	// Find the earliest element > key
+	while (upper >= lower) {
+		i = lower + ((upper - lower) / 2);
+		assert(i >= lower);
+		assert(i <= upper);
+		assert(_array[lower].first <= _array[i].first);
+		assert(_array[i].first <= _array[upper].first);
+
+		assert(i < _size);
+		Entry& elem = _array[i];
+
+		if (elem.first == key) {
+			break;
+		} else if (elem.first > key) {
+			if (i == 0 || _array[i-1].first < key)
+				break;
+			upper = i - 1;
+		} else {
+			lower = i + 1;
+		}
+	}
+
+	// Lil' off by one touchup :)
+	if (i < _size && _array[i].first <= key)
+		++i;
+	
+	_array = (Entry*)realloc(_array, (_size + 1) * sizeof(Entry));
+	
+	// FIXME: This could be faster using memmove etc...
+	for (size_t j=_size; j > i; --j)
+		_array[j] = _array[j-1];
+
+	_array[i] = new_entry;
+
+	++_size;
+
+	assert(is_sorted());
+}
+
+
+template <typename K, typename T>
+void
+Table<K,T>::remove(K& key)
+{
+	iterator i = find(key);
+	if (i != _array.end())
+		remove(i);
+}
+
+
+template <typename K, typename T>
+void
+Table<K,T>::remove(iterator i)
+{
+	_array.erase(i);
+
+#ifndef NDEBUG
+	assert(_array.is_sorted());
+#endif
+}
+
+
+} // namespace Raul
+
-- 
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