Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtinfo/dtinfogen/infolib/etc/Stack.h

@@ -0,0 +1,58 @@
+/* $XConsortium: Stack.h /main/2 1996/07/18 16:49:58 drk $ */
+
+#ifndef STACK_HEADRER
+#define STACK_HEADER
+
+//-----------------------------------------------------------------------
+class Element{
+
+friend class Stack;
+friend class SearchEngine;  
+  
+protected:
+  int name;
+  Element *next;
+  Element( int aName, Element *v=0) { name = aName; next = v; }
+  int GetName() const { return name; }
+  
+};
+
+class Stack {
+private:
+  Element *currentToken;
+  
+public:
+  void push( Element *tok ) { tok->next = currentToken; currentToken = tok; }
+  
+  Element *pop()  {
+    Element *ptr;
+  
+    if ( currentToken ) {
+      ptr = currentToken;
+      currentToken = ptr->next;
+      return ( ptr );
+    }
+    else {
+      return ( NULL );
+    }
+  }
+
+  Element *GetTopToken() { return ( currentToken ); }
+
+  Stack() { currentToken = NULL; }
+  ~Stack();
+    
+};
+
+inline
+Stack::~Stack()
+{
+  Element *pt = currentToken;
+  while ( pt ) {
+    Element *tmp = pt;
+    pt = pt->next;
+    delete tmp;
+  }
+}
+    
+#endif