save some bytes per Q-Register creation on the undo stack

 * a table reference was stored in the UndoToken.
 * since there are only two tables at a given moment, this can
   be avoided by having two different undo tokens, one for globals
   and one for locals.
 * Practically, undo tokens for locals are only created for the
   top-level local Q-Reg table since macro calls with locals
   with set must_undo to false since the local table is destroyed
   with the macro return.

2 files changed, 47 insertions, 21 deletions

diff --git a/src/qregisters.cpp b/src/qregisters.cpp
index 19590c9..7d18910 100644
--- a/src/qregisters.cpp
+++ b/src/qregisters.cpp
@@ -697,6 +697,39 @@ QRegisterClipboard::undo_exchange_string(QRegisterData &reg)
 }
 
 void
+QRegisterTable::UndoTokenRemoveGlobal::run(void)
+{
+	delete (QRegister *)QRegisters::globals.remove(reg);
+}
+
+void
+QRegisterTable::UndoTokenRemoveLocal::run(void)
+{
+	/*
+	 * NOTE: QRegisters::locals should point
+	 * to the correct table when the token is
+	 * executed.
+	 */
+	delete (QRegister *)QRegisters::locals->remove(reg);
+}
+
+void
+QRegisterTable::undo_remove(QRegister *reg)
+{
+	if (!must_undo)
+		return;
+
+	/*
+	 * NOTE: Could also be solved using a virtual
+	 * method and subclasses...
+	 */
+	if (this == &QRegisters::globals)
+		undo.push<UndoTokenRemoveGlobal>(reg);
+	else
+		undo.push<UndoTokenRemoveLocal>(reg);
+}
+
+void
 QRegisterTable::insert_defaults(void)
 {
 	/* general purpose registers */
diff --git a/src/qregisters.h b/src/qregisters.h
index fc7a624..d40a19b 100644
--- a/src/qregisters.h
+++ b/src/qregisters.h
@@ -285,25 +285,23 @@ public:
 };
 
 class QRegisterTable : private RBTreeString, public Object {
-	class UndoTokenRemove : public UndoToken {
-		/*
-		 * NOTE: Storing the table here is only necessary since
-		 * we may have to remove from a global or local Q-Reg
-		 * table. This could be avoided using a separate
-		 * subclass for local registers.
-		 */
-		QRegisterTable *table;
+	class UndoTokenRemoveGlobal : public UndoToken {
+	protected:
 		QRegister *reg;
 
 	public:
-		UndoTokenRemove(QRegisterTable *_table, QRegister *_reg)
-			       : table(_table), reg(_reg) {}
+		UndoTokenRemoveGlobal(QRegister *_reg)
+			             : reg(_reg) {}
 
-		void
-		run(void)
-		{
-			delete (QRegister *)table->remove(reg);
-		}
+		void run(void);
+	};
+
+	class UndoTokenRemoveLocal : public UndoTokenRemoveGlobal {
+	public:
+		UndoTokenRemoveLocal(QRegister *reg)
+			            : UndoTokenRemoveGlobal(reg) {}
+
+		void run(void);
 	};
 
 	bool must_undo;
@@ -320,12 +318,7 @@ public:
 			delete (QRegister *)remove(cur);
 	}
 
-	inline void
-	undo_remove(QRegister *reg)
-	{
-		if (must_undo)
-			undo.push<UndoTokenRemove>(this, reg);
-	}
+	void undo_remove(QRegister *reg);
 
 	inline QRegister *
 	insert(QRegister *reg)