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boost::none - simpler and works with MSVC

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This commit is contained in:
Andrzej Krzemienski
2015-10-01 15:26:15 +02:00
parent 593710e961
commit 9f8dd57386
8 changed files with 66 additions and 18 deletions
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12
include/boost/none.hpp
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@ -22,8 +22,10 @@
namespace boost {
#ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE
none_t const none = (static_cast<none_t>(0)) ;
#else
#elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE
namespace detail { namespace optional_detail {
@ -45,9 +47,13 @@ namespace {
const none_t& none = detail::optional_detail::none_instance<none_t>::instance;
}
#endif
#else
const none_t none ((none_t::init_tag()));
#endif // older definitions
} // namespace boost
#endif
#endif // header guard