125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <mutex>
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#include <shared_mutex>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include "Common/CommonTypes.h"
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#include "Common/Config/Enums.h"
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namespace Config
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{
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namespace detail
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{
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// std::underlying_type may only be used with enum types, so make sure T is an enum type first.
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template <typename T>
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using UnderlyingType = typename std::enable_if_t<std::is_enum<T>{}, std::underlying_type<T>>::type;
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} // namespace detail
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struct Location
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{
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System system{};
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std::string section;
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std::string key;
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bool operator==(const Location& other) const;
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bool operator!=(const Location& other) const;
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bool operator<(const Location& other) const;
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};
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template <typename T>
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struct CachedValue
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{
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T value;
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u64 config_version;
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};
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template <typename T>
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class Info
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{
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public:
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constexpr Info(const Location& location, const T& default_value)
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: m_location{location}, m_default_value{default_value}, m_cached_value{default_value, 0}
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{
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}
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Info(const Info<T>& other) { *this = other; }
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// Not thread-safe
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Info(Info<T>&& other) { *this = std::move(other); }
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// Make it easy to convert Info<Enum> into Info<UnderlyingType<Enum>>
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// so that enum settings can still easily work with code that doesn't care about the enum values.
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template <typename Enum,
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std::enable_if_t<std::is_same<T, detail::UnderlyingType<Enum>>::value>* = nullptr>
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Info(const Info<Enum>& other)
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{
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*this = other;
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}
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Info<T>& operator=(const Info<T>& other)
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{
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m_location = other.GetLocation();
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m_default_value = other.GetDefaultValue();
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m_cached_value = other.GetCachedValue();
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return *this;
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}
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// Not thread-safe
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Info<T>& operator=(Info<T>&& other)
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{
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m_location = std::move(other.m_location);
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m_default_value = std::move(other.m_default_value);
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m_cached_value = std::move(other.m_cached_value);
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return *this;
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}
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// Make it easy to convert Info<Enum> into Info<UnderlyingType<Enum>>
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// so that enum settings can still easily work with code that doesn't care about the enum values.
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template <typename Enum,
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std::enable_if_t<std::is_same<T, detail::UnderlyingType<Enum>>::value>* = nullptr>
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Info<T>& operator=(const Info<Enum>& other)
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{
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m_location = other.GetLocation();
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m_default_value = static_cast<T>(other.GetDefaultValue());
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m_cached_value = other.template GetCachedValueCasted<T>();
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return *this;
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}
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constexpr const Location& GetLocation() const { return m_location; }
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constexpr const T& GetDefaultValue() const { return m_default_value; }
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CachedValue<T> GetCachedValue() const
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{
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std::shared_lock lock(m_cached_value_mutex);
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return m_cached_value;
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}
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template <typename U>
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CachedValue<U> GetCachedValueCasted() const
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{
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std::shared_lock lock(m_cached_value_mutex);
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return CachedValue<U>{static_cast<U>(m_cached_value.value), m_cached_value.config_version};
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}
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void SetCachedValue(const CachedValue<T>& cached_value) const
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{
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std::unique_lock lock(m_cached_value_mutex);
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if (m_cached_value.config_version < cached_value.config_version)
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m_cached_value = cached_value;
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}
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private:
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Location m_location;
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T m_default_value;
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mutable CachedValue<T> m_cached_value;
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mutable std::shared_mutex m_cached_value_mutex;
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};
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} // namespace Config
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