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56 lines
1.9 KiB
56 lines
1.9 KiB
// 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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