moved files around

Bullet/CollisionDispatch/UnionFind.cpp

@@ -0,0 +1,100 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "UnionFind.h"
+#include <assert.h>
+
+
+int UnionFind::find(int x)
+{ 
+	assert(x < m_N);
+	assert(x >= 0);
+
+	while (x != m_id[x]) 
+	{
+		x = m_id[x];
+		assert(x < m_N);
+		assert(x >= 0);
+
+	}
+	return x; 
+}
+
+UnionFind::~UnionFind()
+{
+	Free();
+
+}
+
+UnionFind::UnionFind()
+:m_id(0),
+m_sz(0),
+m_N(0)
+{ 
+
+}
+
+void	UnionFind::Allocate(int N)
+{
+	if (m_N < N)
+	{
+		Free();
+
+		m_N = N;
+		m_id = new int[N]; 
+		m_sz = new int[N];
+	}
+}
+void	UnionFind::Free()
+{
+	if (m_N)
+	{
+		m_N=0;
+		delete m_id;
+		delete m_sz;
+	}
+}
+
+
+void	UnionFind::reset(int N)
+{
+	Allocate(N);
+
+	for (int i = 0; i < m_N; i++) 
+	{ 
+		m_id[i] = i; m_sz[i] = 1; 
+	} 
+}
+
+
+int UnionFind ::find(int p, int q)
+{ 
+	return (find(p) == find(q)); 
+}
+
+void UnionFind ::unite(int p, int q)
+{
+	int i = find(p), j = find(q);
+	if (i == j) 
+		return;
+	if (m_sz[i] < m_sz[j])
+	{ 
+		m_id[i] = j; m_sz[j] += m_sz[i]; 
+	}
+	else 
+	{ 
+		m_id[j] = i; m_sz[i] += m_sz[j]; 
+	}
+}