57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
// scoped_enum_emulation.hpp ---------------------------------------------------------//
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// Copyright Beman Dawes, 2009
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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// Generates C++0x scoped enums if the feature is present, otherwise emulates C++0x
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// scoped enums with C++03 namespaces and enums. The Boost.Config BOOST_NO_SCOPED_ENUMS
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// macro is used to detect feature support.
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//
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// See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf for a
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// description of the scoped enum feature. Note that the committee changed the name
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// from strongly typed enum to scoped enum.
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//
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// Caution: only the syntax is emulated; the semantics are not emulated and
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// the syntax emulation doesn't include being able to specify the underlying
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// representation type.
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//
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// The emulation is via struct rather than namespace to allow use within classes.
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// Thanks to Andrey Semashev for pointing that out.
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//
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// Helpful comments and suggestions were also made by Kjell Elster, Phil Endecott,
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// Joel Falcou, Mathias Gaunard, Felipe Magno de Almeida, Matt Calabrese, Vincente
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// Botet, and Daniel James.
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//
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// Sample usage:
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//
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// BOOST_SCOPED_ENUM_START(algae) { green, red, cyan }; BOOST_SCOPED_ENUM_END
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// ...
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// BOOST_SCOPED_ENUM(algae) sample( algae::red );
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// void foo( BOOST_SCOPED_ENUM(algae) color );
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// ...
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// sample = algae::green;
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// foo( algae::cyan );
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#ifndef BOOST_SCOPED_ENUM_EMULATION_HPP
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#define BOOST_SCOPED_ENUM_EMULATION_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_NO_SCOPED_ENUMS
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# define BOOST_SCOPED_ENUM_START(name) struct name { enum enum_type
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# define BOOST_SCOPED_ENUM_END };
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# define BOOST_SCOPED_ENUM(name) name::enum_type
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#else
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# define BOOST_SCOPED_ENUM_START(name) enum class name
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# define BOOST_SCOPED_ENUM_END
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# define BOOST_SCOPED_ENUM(name) name
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#endif
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#endif // BOOST_SCOPED_ENUM_EMULATION_HPP
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