Implement nested id support

Now the 'id' specifier can optionally include the data member path
to the id inside the composite value. For example:

#pragma db id(first)
std::pair<int, int> p;

Note that one somewhat counter-intuitive aspect of this new feature
is that the whole member marked with id ('p' in the above example)
and not just the actual id member ('p.first' in the above example)
is treated as readonly.

Such nested id also cannot be automatically assigned (auto specifier).

1 files changed, 41 insertions, 0 deletions

diff --git a/common/id/auto/test.hxx b/common/id/auto/test.hxx
new file mode 100644
index 0000000..1605cfe
--- /dev/null
+++ b/common/id/auto/test.hxx
@@ -0,0 +1,41 @@
+// file      : common/id/auto/test.hxx
+// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST_HXX
+#define TEST_HXX
+
+#include <string>
+
+#include <odb/core.hxx>
+
+#pragma db object
+struct object
+{
+  object (const std::string& str)
+      : id_ (1), str_ (str)
+  {
+  }
+
+  #pragma db auto id
+  unsigned long id_;
+  std::string str_;
+
+private:
+  object ()
+  {
+  }
+
+  friend class odb::access;
+};
+
+// Test the case where the object has just the auto id.
+//
+#pragma db object
+struct auto_only
+{
+  #pragma db auto id pgsql:type("BIGINT")
+  unsigned short id_;
+};
+
+#endif // TEST_HXX