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authorMichael Vogt <michael.vogt@ubuntu.com>2010-09-03 14:04:50 +0200
committerMichael Vogt <michael.vogt@ubuntu.com>2010-09-03 14:04:50 +0200
commit0205540433440a9ff4ad4ea4cce44c700a4b401c (patch)
tree97809e2e38482d3d7f124b30552a0936adf4d405 /apt-pkg/contrib/weakptr.h
parent24baab5c477bf1e57a0b169a7bac1d2e9ab0c974 (diff)
parent2c6baa5a1f935eb3b8d4eb9fdef62e696416e27a (diff)
merged from lp:~donkult/apt/sid
Diffstat (limited to 'apt-pkg/contrib/weakptr.h')
-rw-r--r--apt-pkg/contrib/weakptr.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/apt-pkg/contrib/weakptr.h b/apt-pkg/contrib/weakptr.h
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+/* weakptr.h - An object which supports weak pointers.
+ *
+ * Copyright (C) 2010 Julian Andres Klode <jak@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef WEAK_POINTER_H
+#define WEAK_POINTER_H
+
+#include <set>
+/**
+ * Class for objects providing support for weak pointers.
+ *
+ * This class allows for the registration of certain pointers as weak,
+ * which will cause them to be set to NULL when the destructor of the
+ * object is called.
+ */
+class WeakPointable {
+private:
+ std::set<WeakPointable**> pointers;
+
+public:
+
+ /**
+ * Add a new weak pointer.
+ */
+ inline void AddWeakPointer(WeakPointable** weakptr) {
+ pointers.insert(weakptr);
+ }
+
+ /**
+ * Remove the weak pointer from the list of weak pointers.
+ */
+ inline void RemoveWeakPointer(WeakPointable **weakptr) {
+ pointers.erase(weakptr);
+ }
+
+ /**
+ * Deconstruct the object, set all weak pointers to NULL.
+ */
+ ~WeakPointable() {
+ std::set<WeakPointable**>::iterator iter = pointers.begin();
+ while (iter != pointers.end())
+ **(iter++) = NULL;
+ }
+};
+
+#endif // WEAK_POINTER_H