I like it, iff you change the implementation from #ifndef BOOST_NO_SCOPED_ENUMS ... to #ifdef BOOST_NO_SCOPED_ENUMS I do have a hard time with double negations. Kjell E
Date: Thu, 5 Mar 2009 10:37:12 -0500 From: bdawes@acm.org To: boost@lists.boost.org Subject: [boost] [C++0x] Emulation of scoped enums
The improved type safety of the C++0x scoped enum feature is attractive, so I'd like to start using it as it becomes available in compilers.
See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf for a description. Note that the committee changed the name from strongly typed enums to scoped enums.
See the attached for a boost/detail header that provides macro wrappers that use scoped enums if available, otherwise fall back on C++03 namespaces and unscoped enums. It lets a library write:
BOOST_SCOPED_ENUM_START(algae) { green, red, cyan }; BOOST_SCOPED_ENUM_END ... BOOST_SCOPED_ENUM(algae) sample( algae::red ); void func(BOOST_SCOPED_ENUM(algae));
and then a user can write:
sample = algae::green; func( algae::cyan );
Comments or suggestions appreciated,
--Beman
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