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

cde/programs/nsgmls/IQueue.h

@@ -0,0 +1,66 @@
+/* $XConsortium: IQueue.h /main/1 1996/07/29 16:53:51 cde-hp $ */
+// Copyright (c) 1994 James Clark
+// See the file COPYING for copying permission.
+
+#ifndef IQueue_INCLUDED
+#define IQueue_INCLUDED 1
+
+#include "Boolean.h"
+#include "Link.h"
+
+#ifdef SP_NAMESPACE
+namespace SP_NAMESPACE {
+#endif
+
+class IQueueBase {
+public:
+  IQueueBase() : last_(0) { }
+  ~IQueueBase() { }
+  Boolean empty() const { return last_ == 0; }
+  Link *get() {
+    Link *tem = last_->next_;
+    if (tem == last_)
+      last_ = 0;
+    else
+      last_->next_ = tem->next_;
+    return tem;
+  }
+  void append(Link *p) {
+    if (last_) {
+      p->next_ = last_->next_;
+      last_ = last_->next_ = p;
+    }
+    else
+      last_ = p->next_ = p;
+  }
+  void swap(IQueueBase &with) {
+    Link *tem = last_;
+    last_ = with.last_;
+    with.last_ = tem;
+  }
+private:
+  Link *last_;
+
+};
+
+template<class T>
+class IQueue : private IQueueBase {
+public:
+  IQueue() { }
+  ~IQueue() { clear(); }
+  void clear();
+  T *get() { return (T *)IQueueBase::get(); }
+  void append(T *p) { IQueueBase::append(p); }
+  Boolean empty() const { return IQueueBase::empty(); }
+  void swap(IQueue<T> &to) { IQueueBase::swap(to); }
+};
+
+#ifdef SP_NAMESPACE
+}
+#endif
+
+#endif /* not IQueue_INCLUDED */
+
+#ifdef SP_DEFINE_TEMPLATES
+#include "IQueue.C"
+#endif