// 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. // // Helpful comments and suggestions were also made by Kjell Elster, Phil Endecott, // Joel Falcou, Mathias Gaunard, Felipe Magno de Almeida, Matt Calabrese, Vincente // Botet, and Daniel James. // // 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_type # define BOOST_SCOPED_ENUM_END }; # define BOOST_SCOPED_ENUM(name) name::enum_type #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