Added mathsym+tcc and boost against all advice

eo/contrib/mathsym/shared_ptr.h

@@ -0,0 +1,102 @@
+/*	    
+ *             Copyright (C) 2005 Maarten Keijzer
+ *
+ *          This program is free software; you can redistribute it and/or modify
+ *          it under the terms of version 2 of the GNU General Public License as 
+ *          published by the Free Software Foundation. 
+ *
+ *          This program 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 this program; if not, write to the Free Software
+ *          Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _SHARED_PTR_H
+#define _SHARED_PTR_H
+
+
+template <class T> class weak_ptr;
+    
+template <class T>
+class shared_ptr {
+    private:
+	T* ptr;
+	unsigned* count; //
+
+	/* special case, null pointer (nil-code) */
+	static unsigned* nil() { static unsigned nil_counter(1); return &nil_counter; }
+	
+	void decref() { if (--(*count) == 0) { delete ptr; delete count; }} 
+	void incref() { ++(*count); }
+	
+	friend class weak_ptr<T>;
+	
+    public:
+	
+	shared_ptr() : ptr(0), count(nil()) { incref(); }
+	~shared_ptr() { decref(); }
+	
+	shared_ptr(const shared_ptr<T>& o) : ptr(o.ptr), count(o.count) { incref(); }
+	shared_ptr(T* p) : ptr(p), count(new unsigned(1)) {}
+	explicit shared_ptr(const weak_ptr<T>& w) : ptr(w.ptr), count(w.count) { incref(); }
+	
+	shared_ptr<T>& operator=(const shared_ptr<T>& o) {
+	    if (ptr == o.ptr) return *this;
+	    decref();
+	    ptr = o.ptr;
+	    count = o.count;
+	    incref();
+	    return *this;
+	}
+	
+	T* get() { return ptr; }
+	T* operator->() { return ptr; }
+	T& operator*()  { return *ptr; }
+
+	const T* get() const { return ptr; }
+	const T* operator->() const { return ptr; }
+	const T& operator*() const { return *ptr; }
+
+	bool operator==(const shared_ptr<T>& o) const { return ptr == o.ptr; }
+	bool operator!=(const shared_ptr<T>& o) const { return ptr != o.ptr; }
+	bool operator<(const shared_ptr<T>& o) const { return ptr < o.ptr; }	
+
+	unsigned refcount() const { return *count; }
+};
+
+template <class T>
+class weak_ptr {
+	T* ptr;
+	unsigned* count;
+	
+	friend class shared_ptr<T>;
+	
+    public:
+	
+	weak_ptr() : ptr(0), count(shared_ptr<T>::nil()) {}
+	explicit weak_ptr( const shared_ptr<T>& s) : ptr(s.ptr), count(s.count) {}
+	
+	shared_ptr<T> lock() const { return shared_ptr<T>(*this); }
+
+	
+	T* get() { return ptr; }
+	T* operator->() { return ptr; }
+	T& operator*()  { return *ptr; }
+
+	const T* get() const { return ptr; }
+	const T* operator->() const { return ptr; }
+	const T& operator*() const { return *ptr; }
+
+	bool operator==(const shared_ptr<T>& o) const { return ptr == o.ptr; }
+	bool operator!=(const shared_ptr<T>& o) const { return ptr != o.ptr; }
+	bool operator<(const shared_ptr<T>& o) const { return ptr < o.ptr; }	
+	
+	unsigned refcount() const { return *count; }
+	
+};
+
+#endif