// 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 |