new header to define some class partially noncopyable

src/lib/iter-stack.hpp

@@ -50,6 +50,7 @@
 
 #include "lib/error.hpp"
 #include "lib/iter-adapter.hpp"
+#include "lib/nocopy.hpp"
 #include "lib/util.hpp"
 
 #include <deque>
@@ -57,7 +58,6 @@
 
 namespace lib {
   
-  
   namespace { 
     using util::unConst;
     

src/lib/nocopy.hpp

@@ -0,0 +1,59 @@
+/*
+  NOCOPY.hpp  -  some flavours of non-copyable entities
+
+  Copyright (C)         Lumiera.org
+    2012,               Hermann Vosseler <Ichthyostega@web.de>
+
+  This program 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.
+
+  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+
+#ifndef LIB_NOCOPY_H
+#define LIB_NOCOPY_H
+
+#include <boost/noncopyable.hpp>
+
+
+
+namespace util {
+  
+  /**
+   * any copy and copy construction prohibited
+   */
+  class no_copy
+    : boost::noncopyable
+    { };
+  
+  /**
+   * classes inheriting from this mixin
+   * may be created by copy-construction,
+   * but any copy-assignment is prohibited.
+   * @note especially this allows returning
+   *       by-value from a builder function,
+   *       while prohibiting any further copy
+   */
+  class no_copy_by_client
+    {
+     protected:
+       ~no_copy_by_client() {}
+        no_copy_by_client() {}
+        no_copy_by_client (no_copy_by_client const&) {}
+        no_copy_by_client const&
+        operator=(no_copy_by_client const&) { return *this; }
+    };
+  
+} // namespace util
+#endif /*LIB_NOCOPY_H*/

src/proc/mobject/session/query-resolver.hpp

@@ -29,6 +29,7 @@
 #include "lib/bool-checkable.hpp"
 #include "lib/typed-counter.hpp"
 #include "lib/iter-adapter.hpp"
+#include "lib/nocopy.hpp"
 #include "lib/util.hpp"
 
 #include <boost/noncopyable.hpp>
@@ -52,15 +53,6 @@ namespace session {
   using std::tr1::function;
   using std::string;
   
-  class no_copy_by_client
-    {
-     protected:
-       ~no_copy_by_client() {}
-        no_copy_by_client() {}
-        no_copy_by_client (no_copy_by_client const&) {}
-        no_copy_by_client const&
-        operator=(no_copy_by_client const&) { return *this; }
-    };
   
   class Goal;
   class Resolution;
@@ -77,7 +69,7 @@ namespace session {
    * Query ABC
    */
   class Goal
-    : no_copy_by_client
+    : util::no_copy_by_client
     {
     public:
       virtual ~Goal() ;