57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
// 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_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
|