--- parser3/src/include/pa_stack.h	2003/03/27 10:04:06	1.17.2.6.2.2
+++ parser3/src/include/pa_stack.h	2003/10/02 07:26:46	1.20
@@ -8,7 +8,7 @@
 #ifndef PA_STACK_H
 #define PA_STACK_H
 
-static const char* IDENT_STACK_H="$Date: 2003/03/27 10:04:06 $";
+static const char* IDENT_STACK_H="$Date: 2003/10/02 07:26:46 $";
 
 #include "pa_config_includes.h"
 #include "pa_array.h"
@@ -31,19 +31,23 @@ public:
 		return get(--ftop);
 	}
 
-	size_t top_index() { return ftop-1; }
-	void top_index(int top_index) { ftop=top_index+1; }
-	T top_value() { return get(top_index()); }
+	bool is_empty() { return ftop==0; }
+	size_t top_index() { return ftop; }
+	void set_top_index(size_t atop) { ftop=atop; }
+	T top_value() { 
+		assert(!is_empty());
+		return get(ftop-1); 
+	}
 
 	/// call this prior to collecting garbage [in unused part of stack there may be pointers(unused)]
 	void wipe_unused() {
-		if(!is_full())
-			memset(&felements[fused], 0, (fallocated-fused)*sizeof(T));
+		if(size_t above_top_size=fused-ftop)
+			memset(&felements[ftop], 0, above_top_size*sizeof(T));
 	}
 
-private:
+protected:
 
-	// deepest used index
+	// deepest used index+1
 	size_t ftop;
 };