transmission/gtk/Flags.h

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// This file Copyright © 2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <initializer_list>
#include <type_traits>
#define DEFINE_FLAGS_OPERATORS(FlagType) \
constexpr inline Flags<FlagType> operator|(FlagType lhs, FlagType rhs) noexcept \
{ \
return { lhs, rhs }; \
}
template<typename T>
class Flags
{
public:
using FlagType = T;
using ValueType = std::underlying_type_t<FlagType>;
static_assert(std::is_enum_v<FlagType> && !std::is_convertible_v<FlagType, ValueType>);
public:
constexpr Flags() noexcept = default;
constexpr Flags(FlagType flag) noexcept
{
set(flag);
}
constexpr Flags(std::initializer_list<FlagType> flags) noexcept
{
for (auto const flag : flags)
{
set(flag);
}
}
constexpr bool none() const noexcept
{
return value_ == 0;
}
constexpr bool any() const noexcept
{
return !none();
}
constexpr bool test(FlagType flag) const noexcept
{
return (value_ & get_mask(flag)) != 0;
}
constexpr bool test(Flags rhs) const noexcept
{
return (value_ & rhs.value_) != 0;
}
constexpr void set(FlagType flag) noexcept
{
value_ |= get_mask(flag);
}
constexpr Flags operator|(Flags rhs) noexcept
{
return Flags(value_ | rhs.value_);
}
constexpr Flags& operator|=(Flags rhs) noexcept
{
value_ |= rhs.value_;
return *this;
}
constexpr Flags operator~() const noexcept
{
return Flags(~value_);
}
private:
constexpr explicit Flags(ValueType value) noexcept
: value_(value)
{
}
static constexpr ValueType get_mask(FlagType flag) noexcept
{
return ValueType{ 1 } << static_cast<ValueType>(flag);
}
private:
ValueType value_ = {};
};