74 lines
4.2 KiB
C++
74 lines
4.2 KiB
C++
/**************************************************************************/
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/* bit_field.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#pragma once
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#include "core/typedefs.h"
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#include <type_traits>
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// TODO: Replace `typename` with enum concept once C++20 concepts/constraints are allowed.
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template <typename T>
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class BitField {
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static_assert(std::is_enum_v<T>);
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uint64_t value;
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public:
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_ALWAYS_INLINE_ constexpr void set_flag(BitField p_flag) { value |= p_flag.value; }
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_ALWAYS_INLINE_ constexpr bool has_flag(BitField p_flag) const { return value & p_flag.value; }
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_ALWAYS_INLINE_ constexpr bool is_empty() const { return value == 0; }
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_ALWAYS_INLINE_ constexpr void clear_flag(BitField p_flag) { value &= ~p_flag.value; }
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_ALWAYS_INLINE_ constexpr void clear() { value = 0; }
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[[nodiscard]] _ALWAYS_INLINE_ constexpr BitField get_combined(BitField p_other) const { return BitField(value | p_other.value); }
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[[nodiscard]] _ALWAYS_INLINE_ constexpr BitField get_shared(BitField p_other) const { return BitField(value & p_other.value); }
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[[nodiscard]] _ALWAYS_INLINE_ constexpr BitField get_different(BitField p_other) const { return BitField(value ^ p_other.value); }
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_ALWAYS_INLINE_ constexpr BitField() = default;
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_ALWAYS_INLINE_ constexpr BitField(T p_value) :
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value(static_cast<uint64_t>(p_value)) {}
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_ALWAYS_INLINE_ constexpr operator T() const { return static_cast<T>(value); }
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// TODO: Unify as single constructor once C++20 `explicit` conditionals are allowed.
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template <typename V, std::enable_if_t<std::is_arithmetic_v<V> && std::is_convertible_v<T, int>, int> = 0>
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_ALWAYS_INLINE_ constexpr BitField(V p_value) :
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value(static_cast<uint64_t>(p_value)) {}
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template <typename V, std::enable_if_t<std::is_arithmetic_v<V> && !std::is_convertible_v<T, int>, int> = 0>
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_ALWAYS_INLINE_ constexpr explicit BitField(V p_value) :
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value(static_cast<uint64_t>(p_value)) {}
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template <typename V, std::enable_if_t<std::is_arithmetic_v<V>, int> = 0>
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_ALWAYS_INLINE_ constexpr explicit operator V() const { return static_cast<V>(value); }
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};
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// Implicitly zero-constructible as a trivially-constructible type.
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static_assert(is_zero_constructible_v<BitField<Error>>);
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