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Add MSVC workaround for monospace constexpr (refs #25)

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Peter Dimov
2021-03-08 03:26:40 +02:00
parent 8ec0bf448a
commit fb3ce863ff
1 changed files with 13 additions and 0 deletions
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13
include/boost/variant2/variant.hpp
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@ -81,6 +81,8 @@ struct monostate
{ {
}; };
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1940)
constexpr bool operator<(monostate, monostate) noexcept { return false; } constexpr bool operator<(monostate, monostate) noexcept { return false; }
constexpr bool operator>(monostate, monostate) noexcept { return false; } constexpr bool operator>(monostate, monostate) noexcept { return false; }
constexpr bool operator<=(monostate, monostate) noexcept { return true; } constexpr bool operator<=(monostate, monostate) noexcept { return true; }
@ -88,6 +90,17 @@ constexpr bool operator>=(monostate, monostate) noexcept { return true; }
constexpr bool operator==(monostate, monostate) noexcept { return true; } constexpr bool operator==(monostate, monostate) noexcept { return true; }
constexpr bool operator!=(monostate, monostate) noexcept { return false; } constexpr bool operator!=(monostate, monostate) noexcept { return false; }
#else
constexpr bool operator<(monostate const&, monostate const&) noexcept { return false; }
constexpr bool operator>(monostate const&, monostate const&) noexcept { return false; }
constexpr bool operator<=(monostate const&, monostate const&) noexcept { return true; }
constexpr bool operator>=(monostate const&, monostate const&) noexcept { return true; }
constexpr bool operator==(monostate const&, monostate const&) noexcept { return true; }
constexpr bool operator!=(monostate const&, monostate const&) noexcept { return false; }
#endif
// variant forward declaration // variant forward declaration
template<class... T> class variant; template<class... T> class variant;