3 files changed, 41 insertions, 14 deletions
diff --git a/libcommon/common/common.cxx b/libcommon/common/common.cxx
index 66a629f..8be7631 100644
--- a/libcommon/common/common.cxx
+++ b/libcommon/common/common.cxx
@@ -141,3 +141,15 @@ create_database (int& argc,
 
   return db;
 }
+
+bool
+size_available ()
+{
+#if defined(DATABASE_SQLITE) || \
+    defined(DATABASE_ORACLE) || \
+    defined(DATABASE_MSSQL)
+  return false;
+#else
+  return true;
+#endif
+}
diff --git a/libcommon/common/common.hxx b/libcommon/common/common.hxx
index 2cf2357..da3737a 100644
--- a/libcommon/common/common.hxx
+++ b/libcommon/common/common.hxx
@@ -12,7 +12,6 @@
 #include <odb/forward.hxx> // odb::database
 #include <odb/result.hxx>
 
-#include <common/config.hxx>
 #include <common/export.hxx>
 
 // Make sure assert() is not disabled.
@@ -32,18 +31,8 @@ create_database (int& argc,
 //
 template <typename T>
 std::size_t
-size (odb::result<T>& r)
-{
-  std::size_t n (0);
-#if defined(DATABASE_SQLITE) || \
-    defined(DATABASE_ORACLE) || \
-    defined(DATABASE_MSSQL)
-  for (typename odb::result<T>::iterator i (r.begin ()); i != r.end (); ++i)
-    n++;
-#else
-  n = r.size ();
-#endif
-  return n;
-}
+size (odb::result<T>&);
+
+#include <common/common.txx>
 
 #endif // LIBCOMMON_COMMON_COMMON_HXX
diff --git a/libcommon/common/common.txx b/libcommon/common/common.txx
new file mode 100644
index 0000000..ef1461e
--- /dev/null
+++ b/libcommon/common/common.txx
@@ -0,0 +1,26 @@
+// file      : libcommon/common/common.txx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+// We have to use this helper function instead of just checking which
+// database is used because the DATABASE_* macro may not be defined
+// in a project that includes this header.
+//
+LIBCOMMON_EXPORT bool
+size_available ();
+
+template <typename T>
+std::size_t
+size (odb::result<T>& r)
+{
+  if (size_available ())
+    return r.size ();
+  else
+  {
+    std::size_t n (0);
+    for (typename odb::result<T>::iterator i (r.begin ()); i != r.end (); ++i)
+      n++;
+    return n;
+  }
+}