feat(tree): add node bit flags support

src/tree/balancing.c

@@ -0,0 +1,3 @@
+#include "balancing.h"
+
+void vieter_tree_node_balance_after_insert(vieter_tree_node *node) {}

src/tree/balancing.h

@@ -0,0 +1,8 @@
+#ifndef VIETER_TREE_BALANCING
+#define VIETER_TREE_BALANCING
+
+#include "node.h"
+
+void vieter_tree_node_balance_after_insert(vieter_tree_node *node);
+
+#endif

src/tree/node.c

@@ -158,3 +158,15 @@ vieter_tree_error vieter_tree_node_remove(void **out, vieter_tree_node *root,
 
   return vieter_tree_ok;
 }
+
+void vieter_tree_node_set(vieter_tree_node *node, vieter_node_flag flag) {
+  node->flags |= flag;
+}
+
+void vieter_tree_node_unset(vieter_tree_node *node, vieter_node_flag flag) {
+  node->flags &= ~flag;
+}
+
+bool vieter_tree_node_get(vieter_tree_node *node, vieter_node_flag flag) {
+  return (node->flags & flag) != 0;
+}

src/tree/node.h

@@ -3,6 +3,13 @@
 
 #include "vieter_tree.h"
 #include <stdint.h>
+#include <stdbool.h>
+
+#define VIETER_NODE_BLACK ((uint8_t)1)
+
+typedef enum vieter_node_flag {
+    vieter_node_black = ((uint8_t)1) << 0
+} vieter_node_flag;
 
 typedef struct vieter_tree_node {
     uint64_t key;
@@ -10,6 +17,7 @@ typedef struct vieter_tree_node {
     struct vieter_tree_node *parent;
     struct vieter_tree_node *left;
     struct vieter_tree_node *right;
+    uint8_t flags;
 } vieter_tree_node;
 
 vieter_tree_node *vieter_tree_node_init();
@@ -25,4 +33,8 @@ vieter_tree_error vieter_tree_node_remove(void **out, vieter_tree_node *root, ui
 
 void vieter_tree_node_replace(vieter_tree_node *to_replace, vieter_tree_node *replacement);
 
+void vieter_tree_node_set(vieter_tree_node *node, vieter_node_flag flag);
+void vieter_tree_node_unset(vieter_tree_node *node, vieter_node_flag flag);
+bool vieter_tree_node_get(vieter_tree_node *node, vieter_node_flag flag);
+
 #endif