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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 12:34:54 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 12:34:54 +0000
commit0915b3ef56dfac3113cce55a59a5765dc94976be (patch)
treea8fea11d50b4f083e1bf0f90025ece7f0824784a /lib/base/shared-object.hpp
parentInitial commit. (diff)
downloadicinga2-0915b3ef56dfac3113cce55a59a5765dc94976be.tar.xz
icinga2-0915b3ef56dfac3113cce55a59a5765dc94976be.zip
Adding upstream version 2.13.6.upstream/2.13.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--lib/base/shared-object.hpp73
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/base/shared-object.hpp b/lib/base/shared-object.hpp
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+/* Icinga 2 | (c) 2019 Icinga GmbH | GPLv2+ */
+
+#ifndef SHARED_OBJECT_H
+#define SHARED_OBJECT_H
+
+#include "base/atomic.hpp"
+#include "base/object.hpp"
+#include <cstdint>
+
+namespace icinga
+{
+
+class SharedObject;
+
+inline void intrusive_ptr_add_ref(SharedObject *object);
+inline void intrusive_ptr_release(SharedObject *object);
+
+/**
+ * Seamless and polymorphistic base for any class to create shared pointers of.
+ * Saves a memory allocation compared to std::shared_ptr.
+ *
+ * @ingroup base
+ */
+class SharedObject
+{
+ friend void intrusive_ptr_add_ref(SharedObject *object);
+ friend void intrusive_ptr_release(SharedObject *object);
+
+protected:
+ inline SharedObject() : m_References(0)
+ {
+ }
+
+ inline SharedObject(const SharedObject&) : SharedObject()
+ {
+ }
+
+ inline SharedObject(SharedObject&&) : SharedObject()
+ {
+ }
+
+ inline SharedObject& operator=(const SharedObject&)
+ {
+ return *this;
+ }
+
+ inline SharedObject& operator=(SharedObject&&)
+ {
+ return *this;
+ }
+
+ inline virtual
+ ~SharedObject() = default;
+
+private:
+ Atomic<uint_fast64_t> m_References;
+};
+
+inline void intrusive_ptr_add_ref(SharedObject *object)
+{
+ object->m_References.fetch_add(1);
+}
+
+inline void intrusive_ptr_release(SharedObject *object)
+{
+ if (object->m_References.fetch_sub(1) == 1u) {
+ delete object;
+ }
+}
+
+}
+
+#endif /* SHARED_OBJECT_H */