Add support for custom database type mapping

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

1 files changed, 59 insertions, 0 deletions

diff --git a/odb/mssql/details/conversion.hxx b/odb/mssql/details/conversion.hxx
new file mode 100644
index 0000000..4b419da
--- /dev/null
+++ b/odb/mssql/details/conversion.hxx
@@ -0,0 +1,59 @@
+// file      : odb/mssql/details/conversion.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_MSSQL_DETAILS_CONVERSION_HXX
+#define ODB_MSSQL_DETAILS_CONVERSION_HXX
+
+#include <odb/mssql/traits.hxx>
+
+#include <odb/details/meta/answer.hxx>
+
+namespace odb
+{
+  // @@ Revise this.
+  //
+  namespace details {}
+
+  namespace mssql
+  {
+    namespace details
+    {
+      using namespace odb::details;
+
+      // Detect whether conversion is specified in type_traits.
+      //
+      template <typename T>
+      meta::yes
+      conversion_p_test (typename type_traits<T>::conversion*);
+
+      template <typename T>
+      meta::no
+      conversion_p_test (...);
+
+      template <typename T>
+      struct conversion_p
+      {
+        static const bool value =
+          sizeof (conversion_p_test<T> (0)) == sizeof (meta::yes);
+      };
+
+      template <typename T, bool = conversion_p<T>::value>
+      struct conversion;
+
+      template <typename T>
+      struct conversion<T, true>
+      {
+        static const char* to () {return type_traits<T>::conversion::to ();}
+      };
+
+      template <typename T>
+      struct conversion<T, false>
+      {
+        static const char* to () {return 0;}
+      };
+    }
+  }
+}
+
+#endif // ODB_MSSQL_DETAILS_CONVERSION_HXX