1 files changed, 147 insertions, 0 deletions

diff --git a/src/stable/atom.h b/src/stable/atom.h
new file mode 100644
index 0000000..fd88f2d
--- /dev/null
+++ b/src/stable/atom.h
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
+ *
+ * This file is part of the libbu++ library and is released under the
+ * terms of the license contained in the file LICENSE.
+ */
+
+#ifndef BU_ATOM_H
+#define BU_ATOM_H
+
+#include <stdint.h>
+#include <memory>
+#include "bu/config.h"
+#include "bu/exceptionbase.h"
+
+namespace Bu
+{
+        /**
+         *
+         *@ingroup Containers
+         */
+        template <typename t, typename talloc=std::allocator<t> >
+        class Atom
+        {
+        private:
+                typedef struct Atom<t, talloc> MyType;
+
+        public:
+                Atom() :
+                        pData( NULL )
+                {
+                }
+
+                Atom( const MyType &oth ) :
+                        pData( NULL )
+                {
+                        if( oth.pData )
+                                set( *oth.pData );
+                }
+
+                Atom( const t &oth ) :
+                        pData( NULL )
+                {
+                        set( oth );
+                }
+
+                virtual ~Atom()
+                {
+                        clear();
+                }
+
+                bool has() const
+                {
+                        return (pData != NULL);
+                }
+
+                void set( const t &val )
+                {
+                        clear();
+                        pData = ta.allocate( 1 );
+                        ta.construct( pData, val );
+                }
+
+                t &get()
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return *pData;
+                }
+
+                const t &get() const
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return *pData;
+                }
+
+                void clear()
+                {
+                        if( pData )
+                        {
+                                ta.destroy( pData );
+                                ta.deallocate( pData, 1 );
+                                pData = NULL;
+                        }
+                }
+
+                operator const t &() const
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return *pData;
+                }
+                
+                operator t &()
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return *pData;
+                }
+
+                MyType &operator =( const t &oth )
+                {
+                        set( oth );
+
+                        return *this;
+                }
+                
+                MyType &operator =( const MyType &oth )
+                {
+                        if( oth.pData )
+                                set( *oth.pData );
+
+                        return *this;
+                }
+                
+                bool operator ==( const MyType &oth )
+                {
+                        return (*pData) == (*oth.pData);
+                }
+
+                bool operator ==( const t &oth )
+                {
+                        return (*pData) == oth;
+                }
+
+                t *operator ->()
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return pData;
+                }
+
+                t &operator *()
+                {
+                        if( !pData )
+                                throw Bu::ExceptionBase("Not set");
+                        return *pData;
+                }
+
+        private:
+                t *pData;
+                talloc ta;
+        };
+}
+
+#endif