mirror of
https://github.com/matrix-construct/construct
synced 2024-11-05 05:18:54 +01:00
147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_ENUM_H
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namespace ircd::util {
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// For conforming enums include a _NUM_ as the last element,
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// then num_of<my_enum>() works
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template<class Enum>
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constexpr
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typename std::underlying_type<Enum>::type
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num_of()
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{
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return static_cast<typename std::underlying_type<Enum>::type>(Enum::_NUM_);
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}
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// Iteration of a num_of() conforming enum
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template<class Enum>
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typename std::enable_if<std::is_enum<Enum>::value, void>::type
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for_each(const std::function<void (const Enum &)> &func)
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{
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for(size_t i(0); i < num_of<Enum>(); ++i)
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func(static_cast<Enum>(i));
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}
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/**
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* flag-enum utilities
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*
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* This relaxes the strong typing of enums to allow bitflags with operations on the elements
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* with intuitive behavior.
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*
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* If the project desires absolute guarantees on the strong enum typing then this can be tucked
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* away in some namespace and imported into select scopes instead.
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*/
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
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operator~(const Enum &a)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(~static_cast<enum_t>(a));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, bool>::type
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operator!(const Enum &a)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return !static_cast<enum_t>(a);
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
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operator|(const Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<enum_t>(a) | static_cast<enum_t>(b));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
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operator&(const Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<enum_t>(a) & static_cast<enum_t>(b));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum>::type
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operator^(const Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return static_cast<Enum>(static_cast<enum_t>(a) ^ static_cast<enum_t>(b));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
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operator|=(Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return (a = (a | b));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
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operator&=(Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return (a = (a & b));
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}
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template<class Enum>
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constexpr
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typename std::enable_if<std::is_enum<Enum>::value, Enum &>::type
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operator^=(Enum &a, const Enum &b)
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{
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using enum_t = typename std::underlying_type<Enum>::type;
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return (a = (a ^ b));
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}
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template<class Enum,
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class it>
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typename std::enable_if<std::is_enum<Enum>::value, typename std::underlying_type<Enum>::type>::type
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combine_flags(const it &begin,
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const it &end)
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{
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using type = typename std::underlying_type<Enum>::type;
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return std::accumulate(begin, end, type(0), []
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(auto ret, const auto &val)
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{
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return ret |= type(val);
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});
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}
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template<class Enum>
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typename std::enable_if<std::is_enum<Enum>::value, typename std::underlying_type<Enum>::type>::type
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combine_flags(const std::initializer_list<Enum> &list)
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{
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return combine_flags<Enum>(begin(list), end(list));
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}
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} // namespace ircd::util
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