Added the parts of boost which we need to access shared_ptr and weak_ptr. This will allow for improved memory management of large volumes.

library/include/boost/detail/shared_ptr_nmt.hpp

@@ -0,0 +1,182 @@
+#ifndef BOOST_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED
+#define BOOST_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED
+
+//
+//  detail/shared_ptr_nmt.hpp - shared_ptr.hpp without member templates
+//
+//  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
+//  Copyright (c) 2001, 2002 Peter Dimov
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//  See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
+//
+
+#include <boost/assert.hpp>
+#include <boost/checked_delete.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/detail/atomic_count.hpp>
+
+#ifndef BOOST_NO_AUTO_PTR
+# include <memory>          // for std::auto_ptr
+#endif
+
+#include <algorithm>        // for std::swap
+#include <functional>       // for std::less
+#include <new>              // for std::bad_alloc
+
+namespace boost
+{
+
+template<class T> class shared_ptr
+{
+private:
+
+    typedef detail::atomic_count count_type;
+
+public:
+
+    typedef T element_type;
+    typedef T value_type;
+
+    explicit shared_ptr(T * p = 0): px(p)
+    {
+#ifndef BOOST_NO_EXCEPTIONS
+
+        try  // prevent leak if new throws
+        {
+            pn = new count_type(1);
+        }
+        catch(...)
+        {
+            boost::checked_delete(p);
+            throw;
+        }
+
+#else
+
+        pn = new count_type(1);
+
+        if(pn == 0)
+        {
+            boost::checked_delete(p);
+            boost::throw_exception(std::bad_alloc());
+        }
+
+#endif
+    }
+
+    ~shared_ptr()
+    {
+        if(--*pn == 0)
+        {
+            boost::checked_delete(px);
+            delete pn;
+        }
+    }
+
+    shared_ptr(shared_ptr const & r): px(r.px)  // never throws
+    {
+        pn = r.pn;
+        ++*pn;
+    }
+
+    shared_ptr & operator=(shared_ptr const & r)
+    {
+        shared_ptr(r).swap(*this);
+        return *this;
+    }
+
+#ifndef BOOST_NO_AUTO_PTR
+
+    explicit shared_ptr(std::auto_ptr<T> & r)
+    { 
+        pn = new count_type(1); // may throw
+        px = r.release(); // fix: moved here to stop leak if new throws
+    } 
+
+    shared_ptr & operator=(std::auto_ptr<T> & r)
+    {
+        shared_ptr(r).swap(*this);
+        return *this;
+    }
+
+#endif
+
+    void reset(T * p = 0)
+    {
+        BOOST_ASSERT(p == 0 || p != px);
+        shared_ptr(p).swap(*this);
+    }
+
+    T & operator*() const  // never throws
+    {
+        BOOST_ASSERT(px != 0);
+        return *px;
+    }
+
+    T * operator->() const  // never throws
+    {
+        BOOST_ASSERT(px != 0);
+        return px;
+    }
+
+    T * get() const  // never throws
+    {
+        return px;
+    }
+
+    long use_count() const  // never throws
+    {
+        return *pn;
+    }
+
+    bool unique() const  // never throws
+    {
+        return *pn == 1;
+    }
+    
+    void swap(shared_ptr<T> & other)  // never throws
+    {
+        std::swap(px, other.px);
+        std::swap(pn, other.pn);
+    }
+
+private:
+
+    T * px;            // contained pointer
+    count_type * pn;   // ptr to reference counter
+};
+
+template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b)
+{
+    return a.get() == b.get();
+}
+
+template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b)
+{
+    return a.get() != b.get();
+}
+
+template<class T> inline bool operator<(shared_ptr<T> const & a, shared_ptr<T> const & b)
+{
+    return std::less<T*>()(a.get(), b.get());
+}
+
+template<class T> void swap(shared_ptr<T> & a, shared_ptr<T> & b)
+{
+    a.swap(b);
+}
+
+// get_pointer() enables boost::mem_fn to recognize shared_ptr
+
+template<class T> inline T * get_pointer(shared_ptr<T> const & p)
+{
+    return p.get();
+}
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED