Add RAII handle management for OCI handles and descriptors

1 files changed, 95 insertions, 0 deletions

diff --git a/odb/oracle/auto-descriptor.hxx b/odb/oracle/auto-descriptor.hxx
new file mode 100644
index 0000000..9e3172c
--- /dev/null
+++ b/odb/oracle/auto-descriptor.hxx
@@ -0,0 +1,95 @@
+// file      : odb/oracle/auto-descriptor.hxx
+// author    : Constantin Michael <constantin@codesynthesis.com>
+// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
+// license   : ODB NCUEL; see accompanying LICENSE file
+
+#ifndef ODB_ORACLE_AUTO_DESCRIPTOR_HXX
+#define ODB_ORACLE_AUTO_DESCRIPTOR_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/oracle/version.hxx>
+#include <odb/oracle/oracle-fwd.hxx>
+
+#include <odb/oracle/details/export.hxx>
+
+namespace odb
+{
+  namespace oracle
+  {
+    //
+    // descriptor_type_traits
+    //
+
+    template <typename D>
+    struct descriptor_type_traits;
+
+    template <>
+    struct descriptor_type_traits<OCIParam>
+    { static const ub4 dtype; };
+
+    //
+    // descriptor_traits
+    //
+
+    LIBODB_ORACLE_EXPORT void
+    oci_descriptor_free (void* descriptor, ub4 type);
+
+    template <typename D>
+    struct descriptor_traits
+    {
+      static void
+      release (OCIParam* d)
+      {
+        oci_descriptor_free (d, descriptor_type_traits<D>::dtype);
+      }
+    };
+
+    template <typename D>
+    class auto_descriptor
+    {
+    public:
+      auto_descriptor (D* d = 0)
+          : d_ (d)
+      {
+      }
+
+      ~auto_descriptor ()
+      {
+        if (d_ != 0)
+          descriptor_traits<D>::release (d_);
+      }
+
+      operator D* ()
+      {
+        return d_;
+      }
+
+      D*
+      get ()
+      {
+        return d_;
+      }
+
+      void
+      reset (D* d = 0)
+      {
+        if (d_ != 0)
+          descriptor_traits<D>::release (d_);
+
+        d_ = d;
+      }
+
+    private:
+      auto_descriptor (const auto_descriptor&);
+      auto_descriptor& operator= (const auto_descriptor&);
+
+    private:
+      D* d_;
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_ORACLE_AUTO_DESCRIPTOR_HXX