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

cde/programs/nsgmls/Owner.h

@@ -0,0 +1,61 @@
+/* $XConsortium: Owner.h /main/3 1996/08/13 14:30:51 mgreess $ */
+// Copyright (c) 1994 James Clark
+// See the file COPYING for copying permission.
+
+#ifndef Owner_INCLUDED
+#define Owner_INCLUDED 1
+
+// A pointer that owns the object pointed to.
+// T must be of class type.
+// This is coded so that T need not yet have been defined.
+
+#ifdef SP_NAMESPACE
+namespace SP_NAMESPACE {
+#endif
+
+template<class T>
+class Owner {
+public:
+  Owner() : p_(0) { }
+  Owner(T *p) : p_(p) { }
+  ~Owner();
+  void operator=(T *p) {
+    if (p_) del();
+    p_ = p;
+  }
+  operator int() const { return p_ != 0; }
+  T *pointer() const { return p_; }
+  T *operator->() const { return p_; }
+  T &operator*() const { return *p_; }
+  void swap(Owner<T> &x) {
+    T *tem = p_;
+    p_ = x.p_;
+    x.p_ = tem;
+  }
+  T *extract() {
+    T *tem = p_;
+    p_ = 0;
+    return tem;
+  }
+  void clear() {
+    if (p_) {
+      del();
+      p_ = 0;
+    }
+  }
+private:
+  Owner(const Owner<T> &) {}
+  void operator=(const Owner<T> &) {}
+  void del();
+  T *p_;
+};
+
+#ifdef SP_NAMESPACE
+}
+#endif
+
+#endif /* not Owner_INCLUDED */
+
+#ifdef SP_DEFINE_TEMPLATES
+#include "Owner.C"
+#endif