Add recoverable, connection_lost, and timeout exceptions

The deadlock exception now inherits from recoverable. New manual section:
3.5, "Error Handling and Recovery".

2 files changed, 32 insertions, 1 deletions

diff --git a/odb/exceptions.cxx b/odb/exceptions.cxx
index 27a0e8b..1d4be70 100644
--- a/odb/exceptions.cxx
+++ b/odb/exceptions.cxx
@@ -55,6 +55,18 @@ namespace odb
     return "transaction aborted due to deadlock";
   }
 
+  const char* connection_lost::
+  what () const throw ()
+  {
+    return "connection to database lost";
+  }
+
+  const char* timeout::
+  what () const throw ()
+  {
+    return "database operation timeout";
+  }
+
   const char* object_not_persistent::
   what () const throw ()
   {
diff --git a/odb/exceptions.hxx b/odb/exceptions.hxx
index 362c7b0..1185876 100644
--- a/odb/exceptions.hxx
+++ b/odb/exceptions.hxx
@@ -62,7 +62,23 @@ namespace odb
 
   // Database operations exceptions.
   //
-  struct LIBODB_EXPORT deadlock: exception
+  struct LIBODB_EXPORT recoverable: exception
+  {
+  };
+
+  struct LIBODB_EXPORT connection_lost: recoverable
+  {
+    virtual const char*
+    what () const throw ();
+  };
+
+  struct LIBODB_EXPORT timeout: recoverable
+  {
+    virtual const char*
+    what () const throw ();
+  };
+
+  struct LIBODB_EXPORT deadlock: recoverable
   {
     virtual const char*
     what () const throw ();
@@ -102,7 +118,10 @@ namespace odb
     using odb::not_in_session;
     using odb::const_object;
 
+    using odb::recoverable;
     using odb::deadlock;
+    using odb::connection_lost;
+    using odb::timeout;
     using odb::object_not_persistent;
     using odb::object_already_persistent;
     using odb::result_not_cached;