Continue C++ rewrite.

killring.h

@@ -0,0 +1,44 @@
+#ifndef KILLRING_HPP
+#define KILLRING_HPP
+
+#include <cstdint>
+
+// Forward declarations
+struct editor_t;
+
+namespace ke {
+
+/**
+ * Killring class for cut/paste (kill/yank) operations.
+ */
+class Killring {
+public:
+    Killring() = default;
+    ~Killring() = default;
+    
+    // Deleted copy constructor and assignment
+    Killring(const Killring&) = delete;
+    Killring& operator=(const Killring&) = delete;
+    
+    // Killring operations
+    static void flush(editor_t* editor);
+    static void yank(editor_t* editor);
+    static void start_with_char(editor_t* editor, unsigned char ch);
+    static void append_char(editor_t* editor, unsigned char ch);
+    static void prepend_char(editor_t* editor, unsigned char ch);
+    
+    // Mark operations
+    static void toggle_markset(editor_t* editor);
+    static int cursor_after_mark(editor_t* editor);
+    
+    // Region operations
+    static void kill_region(editor_t* editor);
+    static void delete_region(editor_t* editor);
+    
+private:
+    static int count_chars_from_cursor_to_mark(editor_t* editor);
+};
+
+} // namespace ke
+
+#endif // KILLRING_HPP