[Boost-commit] svn:boost r51715 - trunk/boost/detail

Subject: [Boost-commit] svn:boost r51715 - trunk/boost/detail
From: bdawes_at_[hidden]
Date: 2009-03-11 16:19:28

Author: bemandawes
Date: 2009-03-11 16:19:27 EDT (Wed, 11 Mar 2009)
New Revision: 51715
URL: http://svn.boost.org/trac/boost/changeset/51715

Log:
Initial commit.
Added:
   trunk/boost/detail/scoped_enum_emulation.hpp   (contents, props changed)

Added: trunk/boost/detail/scoped_enum_emulation.hpp
==============================================================================
--- (empty file)
+++ trunk/boost/detail/scoped_enum_emulation.hpp	2009-03-11 16:19:27 EDT (Wed, 11 Mar 2009)
@@ -0,0 +1,52 @@
+//  scoped_enum_emulation.hpp  ---------------------------------------------------------//
+
+//  Copyright Beman Dawes, 2009
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+//  Generates C++0x scoped enums if the feature is present, otherwise emulates C++0x
+//  scoped enums with C++03 namespaces and enums. The Boost.Config BOOST_NO_SCOPED_ENUMS
+//  macro is used to detect feature support.
+//
+//  See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf for a
+//  description of the scoped enum feature. Note that the committee changed the name
+//  from strongly typed enum to scoped enum.  
+//
+//  Caution: only the syntax is emulated; the semantics are not emulated and
+//  the syntax emulation doesn't include being able to specify the underlying
+//  representation type.
+//
+//  The emulation is via struct rather than namespace to allow use within classes.
+//  Thanks to Andrey Semashev for pointing that out.
+//
+//  Sample usage:
+//
+//     BOOST_SCOPED_ENUM_START(algae) { green, red, cyan }; BOOST_SCOPED_ENUM_END
+//     ...
+//     BOOST_SCOPED_ENUM(algae) sample( algae::red );
+//     void foo( BOOST_SCOPED_ENUM(algae) color );
+//     ...
+//     sample = algae::green;
+//     foo( algae::cyan );
+
+#ifndef BOOST_SCOPED_ENUM_EMULATION_HPP
+#define BOOST_SCOPED_ENUM_EMULATION_HPP
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_NO_SCOPED_ENUMS
+
+# define BOOST_SCOPED_ENUM_START(name) struct name { enum enum_t
+# define BOOST_SCOPED_ENUM_END };
+# define BOOST_SCOPED_ENUM(name) name::enum_t
+
+#else
+
+# define BOOST_SCOPED_ENUM_START(name) enum class name
+# define BOOST_SCOPED_ENUM_END
+# define BOOST_SCOPED_ENUM(name) name
+
+#endif
+
+#endif  // BOOST_SCOPED_ENUM_EMULATION_HPP