common/tree: Convert defines over to templates

Reworks the tree header to operate off of templates as opposed to a
series of defines.

This allows all tree facilities to obey namespacing rules, and also
allows this code to be used within modules once compiler support is in
place.

This also gets rid to use a macro to define functions and structs for
necessary data types. With templates, these will be generated when
they're actually used, eliminating the need for the separate
declaration.

src/common/intrusive_red_black_tree.h

@@ -16,17 +16,30 @@ class IntrusiveRedBlackTreeImpl;
 }
 
 struct IntrusiveRedBlackTreeNode {
+public:
+    using EntryType = RBEntry<IntrusiveRedBlackTreeNode>;
+
+    constexpr IntrusiveRedBlackTreeNode() = default;
+
+    void SetEntry(const EntryType& new_entry) {
+        entry = new_entry;
+    }
+
+    [[nodiscard]] EntryType& GetEntry() {
+        return entry;
+    }
+
+    [[nodiscard]] const EntryType& GetEntry() const {
+        return entry;
+    }
 
 private:
-    RB_ENTRY(IntrusiveRedBlackTreeNode) entry{};
+    EntryType entry{};
 
     friend class impl::IntrusiveRedBlackTreeImpl;
 
     template <class, class, class>
     friend class IntrusiveRedBlackTree;
-
-public:
-    constexpr IntrusiveRedBlackTreeNode() = default;
 };
 
 template <class T, class Traits, class Comparator>
@@ -35,17 +48,12 @@ class IntrusiveRedBlackTree;
 namespace impl {
 
 class IntrusiveRedBlackTreeImpl {
-
 private:
     template <class, class, class>
     friend class ::Common::IntrusiveRedBlackTree;
 
-private:
-    RB_HEAD(IntrusiveRedBlackTreeRoot, IntrusiveRedBlackTreeNode);
-    using RootType = IntrusiveRedBlackTreeRoot;
-
-private:
-    IntrusiveRedBlackTreeRoot root;
+    using RootType = RBHead<IntrusiveRedBlackTreeNode>;
+    RootType root;
 
 public:
     template <bool Const>
@@ -121,57 +129,45 @@ public:
         }
     };
 
-protected:
-    // Generate static implementations for non-comparison operations for IntrusiveRedBlackTreeRoot.
-    RB_GENERATE_WITHOUT_COMPARE_STATIC(IntrusiveRedBlackTreeRoot, IntrusiveRedBlackTreeNode, entry);
-
 private:
     // Define accessors using RB_* functions.
-    constexpr void InitializeImpl() {
-        RB_INIT(&this->root);
-    }
-
     bool EmptyImpl() const {
-        return RB_EMPTY(&this->root);
+        return root.IsEmpty();
     }
 
     IntrusiveRedBlackTreeNode* GetMinImpl() const {
-        return RB_MIN(IntrusiveRedBlackTreeRoot,
-                      const_cast<IntrusiveRedBlackTreeRoot*>(&this->root));
+        return RB_MIN(const_cast<RootType*>(&root));
     }
 
     IntrusiveRedBlackTreeNode* GetMaxImpl() const {
-        return RB_MAX(IntrusiveRedBlackTreeRoot,
-                      const_cast<IntrusiveRedBlackTreeRoot*>(&this->root));
+        return RB_MAX(const_cast<RootType*>(&root));
     }
 
     IntrusiveRedBlackTreeNode* RemoveImpl(IntrusiveRedBlackTreeNode* node) {
-        return RB_REMOVE(IntrusiveRedBlackTreeRoot, &this->root, node);
+        return RB_REMOVE(&root, node);
     }
 
 public:
     static IntrusiveRedBlackTreeNode* GetNext(IntrusiveRedBlackTreeNode* node) {
-        return RB_NEXT(IntrusiveRedBlackTreeRoot, nullptr, node);
+        return RB_NEXT(node);
     }
 
     static IntrusiveRedBlackTreeNode* GetPrev(IntrusiveRedBlackTreeNode* node) {
-        return RB_PREV(IntrusiveRedBlackTreeRoot, nullptr, node);
+        return RB_PREV(node);
     }
 
-    static IntrusiveRedBlackTreeNode const* GetNext(const IntrusiveRedBlackTreeNode* node) {
+    static const IntrusiveRedBlackTreeNode* GetNext(const IntrusiveRedBlackTreeNode* node) {
         return static_cast<const IntrusiveRedBlackTreeNode*>(
             GetNext(const_cast<IntrusiveRedBlackTreeNode*>(node)));
     }
 
-    static IntrusiveRedBlackTreeNode const* GetPrev(const IntrusiveRedBlackTreeNode* node) {
+    static const IntrusiveRedBlackTreeNode* GetPrev(const IntrusiveRedBlackTreeNode* node) {
         return static_cast<const IntrusiveRedBlackTreeNode*>(
             GetPrev(const_cast<IntrusiveRedBlackTreeNode*>(node)));
     }
 
 public:
-    constexpr IntrusiveRedBlackTreeImpl() : root() {
-        this->InitializeImpl();
-    }
+    constexpr IntrusiveRedBlackTreeImpl() {}
 
     // Iterator accessors.
     iterator begin() {
@@ -269,8 +265,6 @@ private:
     ImplType impl{};
 
 public:
-    struct IntrusiveRedBlackTreeRootWithCompare : ImplType::IntrusiveRedBlackTreeRoot {};
-
     template <bool Const>
     class Iterator;
 
@@ -362,11 +356,6 @@ public:
         }
     };
 
-private:
-    // Generate static implementations for comparison operations for IntrusiveRedBlackTreeRoot.
-    RB_GENERATE_WITH_COMPARE_STATIC(IntrusiveRedBlackTreeRootWithCompare, IntrusiveRedBlackTreeNode,
-                                    entry, CompareImpl, LightCompareImpl);
-
 private:
     static int CompareImpl(const IntrusiveRedBlackTreeNode* lhs,
                            const IntrusiveRedBlackTreeNode* rhs) {
@@ -379,41 +368,27 @@ private:
 
     // Define accessors using RB_* functions.
     IntrusiveRedBlackTreeNode* InsertImpl(IntrusiveRedBlackTreeNode* node) {
-        return RB_INSERT(IntrusiveRedBlackTreeRootWithCompare,
-                         static_cast<IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root),
-                         node);
+        return RB_INSERT(&impl.root, node, CompareImpl);
     }
 
     IntrusiveRedBlackTreeNode* FindImpl(const IntrusiveRedBlackTreeNode* node) const {
-        return RB_FIND(
-            IntrusiveRedBlackTreeRootWithCompare,
-            const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
-                static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
-            const_cast<IntrusiveRedBlackTreeNode*>(node));
+        return RB_FIND(const_cast<ImplType::RootType*>(&impl.root),
+                       const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl);
     }
 
     IntrusiveRedBlackTreeNode* NFindImpl(const IntrusiveRedBlackTreeNode* node) const {
-        return RB_NFIND(
-            IntrusiveRedBlackTreeRootWithCompare,
-            const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
-                static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
-            const_cast<IntrusiveRedBlackTreeNode*>(node));
+        return RB_NFIND(const_cast<ImplType::RootType*>(&impl.root),
+                        const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl);
     }
 
     IntrusiveRedBlackTreeNode* FindLightImpl(const_light_pointer lelm) const {
-        return RB_FIND_LIGHT(
-            IntrusiveRedBlackTreeRootWithCompare,
-            const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
-                static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
-            static_cast<const void*>(lelm));
+        return RB_FIND_LIGHT(const_cast<ImplType::RootType*>(&impl.root),
+                             static_cast<const void*>(lelm), LightCompareImpl);
     }
 
     IntrusiveRedBlackTreeNode* NFindLightImpl(const_light_pointer lelm) const {
-        return RB_NFIND_LIGHT(
-            IntrusiveRedBlackTreeRootWithCompare,
-            const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
-                static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
-            static_cast<const void*>(lelm));
+        return RB_NFIND_LIGHT(const_cast<ImplType::RootType*>(&impl.root),
+                              static_cast<const void*>(lelm), LightCompareImpl);
     }
 
 public: