| // 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 |