64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#ifndef flags_hh_INCLUDED
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#define flags_hh_INCLUDED
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#include <type_traits>
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namespace Kakoune
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{
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template<typename Flags>
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struct WithBitOps : std::false_type {};
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template<typename Flags>
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using UnderlyingType = typename std::underlying_type<Flags>::type;
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template<typename Flags, typename T = void>
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using EnableIfWithBitOps = typename std::enable_if<WithBitOps<Flags>::value, T>::type;
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template<typename Flags, typename T = void>
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using EnableIfWithoutBitOps = typename std::enable_if<not WithBitOps<Flags>::value, T>::type;
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template<typename Flags, typename = EnableIfWithBitOps<Flags>>
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constexpr Flags operator|(Flags lhs, Flags rhs)
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{
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return (Flags)((UnderlyingType<Flags>) lhs | (UnderlyingType<Flags>) rhs);
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}
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template<typename Flags, typename = EnableIfWithBitOps<Flags>>
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Flags& operator|=(Flags& lhs, Flags rhs)
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{
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(UnderlyingType<Flags>&) lhs |= (UnderlyingType<Flags>) rhs;
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return lhs;
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}
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template<typename Flags>
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struct TestableFlags
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{
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Flags value;
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constexpr operator bool() const { return (UnderlyingType<Flags>)value; }
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constexpr operator Flags() const { return value; }
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};
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template<typename Flags, typename = EnableIfWithBitOps<Flags>>
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constexpr TestableFlags<Flags> operator&(Flags lhs, Flags rhs)
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{
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return { (Flags)((UnderlyingType<Flags>) lhs & (UnderlyingType<Flags>) rhs) };
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}
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template<typename Flags, typename = EnableIfWithBitOps<Flags>>
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Flags& operator&=(Flags& lhs, Flags rhs)
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{
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(UnderlyingType<Flags>&) lhs &= (UnderlyingType<Flags>) rhs;
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return lhs;
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}
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template<typename Flags, typename = EnableIfWithBitOps<Flags>>
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constexpr Flags operator~(Flags lhs)
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{
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return (Flags)(~(UnderlyingType<Flags>)lhs);
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}
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}
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#endif // flags_hh_INCLUDED
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