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boost::none - simpler and works with MSVC
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@ -16,13 +16,25 @@
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namespace boost {
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#ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE
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namespace detail { struct none_helper{}; }
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typedef int detail::none_helper::*none_t ;
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#else
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#elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE
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class none_t {};
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#endif
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#else
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struct none_t
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{
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struct init_tag{};
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explicit none_t(init_tag){} // to prevent default constructor
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};
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#endif // old implementation workarounds
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} // namespace boost
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#endif
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#endif // header guard
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