settings: Move some simple data to BasicSetting

Reduces the need for the compiler to duplicate this code, by about
100KB executable size.

src/common/settings_common.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 #pragma once
 
 #include <forward_list>
@@ -40,31 +43,7 @@ enum class Category : u32 {
     MaxEnum,
 };
 
-class BasicSetting {
-protected:
-    explicit BasicSetting() = default;
-
-public:
-    virtual ~BasicSetting() = default;
-
-    virtual Category Category() const = 0;
-    virtual constexpr bool Switchable() const = 0;
-    virtual std::string ToString() const = 0;
-    virtual std::string ToStringGlobal() const;
-    virtual void LoadString(const std::string& load) = 0;
-    virtual std::string Canonicalize() const = 0;
-    virtual const std::string& GetLabel() const = 0;
-    virtual std::string DefaultToString() const = 0;
-    virtual bool Save() const = 0;
-    virtual std::type_index TypeId() const = 0;
-    virtual constexpr bool IsEnum() const = 0;
-    virtual bool RuntimeModfiable() const = 0;
-    virtual void SetGlobal(bool global) {}
-    virtual constexpr u32 Id() const = 0;
-    virtual std::string MinVal() const = 0;
-    virtual std::string MaxVal() const = 0;
-    virtual bool UsingGlobal() const;
-};
+class BasicSetting;
 
 class Linkage {
 public:
@@ -75,4 +54,71 @@ public:
     u32 count;
 };
 
+class BasicSetting {
+protected:
+    explicit BasicSetting(Linkage& linkage, const std::string& name, enum Category category_,
+                          bool save_, bool runtime_modifiable_);
+
+public:
+    virtual ~BasicSetting();
+
+    /* Data retrieval */
+
+    [[nodiscard]] virtual std::string ToString() const = 0;
+    [[nodiscard]] virtual std::string ToStringGlobal() const;
+    [[nodiscard]] virtual std::string DefaultToString() const = 0;
+    [[nodiscard]] virtual std::string MinVal() const = 0;
+    [[nodiscard]] virtual std::string MaxVal() const = 0;
+    virtual void LoadString(const std::string& load) = 0;
+    [[nodiscard]] virtual std::string Canonicalize() const = 0;
+
+    /* Identification */
+
+    [[nodiscard]] virtual std::type_index TypeId() const = 0;
+    [[nodiscard]] virtual constexpr bool IsEnum() const = 0;
+    /**
+     * Returns whether the current setting is Switchable.
+     *
+     * @returns If the setting is a SwitchableSetting
+     */
+    [[nodiscard]] virtual constexpr bool Switchable() const {
+        return false;
+    }
+    /**
+     * Returns the save preference of the setting i.e. when saving or reading the setting from a
+     * frontend, whether this setting should be skipped.
+     *
+     * @returns The save preference
+     */
+    [[nodiscard]] bool Save() const;
+    [[nodiscard]] bool RuntimeModfiable() const;
+    [[nodiscard]] constexpr u32 Id() const {
+        return id;
+    }
+    /**
+     * Returns the setting's category AKA INI group.
+     *
+     * @returns The setting's category
+     */
+    [[nodiscard]] Category Category() const;
+    /**
+     * Returns the label this setting was created with.
+     *
+     * @returns A reference to the label
+     */
+    [[nodiscard]] const std::string& GetLabel() const;
+
+    /* Switchable settings */
+
+    virtual void SetGlobal(bool global);
+    [[nodiscard]] virtual bool UsingGlobal() const;
+
+private:
+    const std::string label;      ///< The setting's label
+    const enum Category category; ///< The setting's category AKA INI group
+    const u32 id;
+    const bool save;
+    const bool runtime_modifiable;
+};
+
 } // namespace Settings