Add support for custom database type mapping

New pragma qualifier, map, and specifiers: as, to, from. New tests:
<database>/custom.

1 files changed, 16 insertions, 0 deletions

diff --git a/odb/relational/context.cxx b/odb/relational/context.cxx
index 8630a30..08e68e5 100644
--- a/odb/relational/context.cxx
+++ b/odb/relational/context.cxx
@@ -44,6 +44,22 @@ namespace relational
     current_ = this;
   }
 
+  string context::
+  convert (string const& e, string const& c)
+  {
+    size_t p (c.find ("(?)"));
+    string r (c, 0, p);
+    r += e;
+    r.append (c, p + 3, string::npos);
+    return r;
+  }
+
+  string const& context::
+  convert_expr (string const&, semantics::data_member&, bool)
+  {
+    assert (false);
+  }
+
   bool context::
   grow_impl (semantics::class_&)
   {