Improvement of class hierarchy

Description:
    - Moved class Attribute to be derived from class H5Location instead of
      IdComponent because an attribute id can be used as loc_id in C APIs.
    - Copied wrappers of H5A APIs in H5Location into H5Object because H5A
      functions do not take an attribute id as loc_id.  The original wrappers
      will be deprecated in future releases.
    - Revised comments
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 (platypus)
    Darwin (osx1010test)

1 files changed, 12 insertions, 0 deletions

diff --git a/c++/test/tfile.cpp b/c++/test/tfile.cpp
index bd229d7..6e12dfd 100644
--- a/c++/test/tfile.cpp
+++ b/c++/test/tfile.cpp
@@ -601,6 +601,18 @@ static void test_file_attribute()
         n_attrs = dataset.getNumAttrs();
         verify_val(n_attrs, 1, "DataSet::getNumAttrs()", __LINE__, __FILE__);
 
+        // Get and verify the number of attributes at the location specified
+        // by a dataset's attribute
+        n_attrs = 0;
+        n_attrs = dattr.getNumAttrs();
+        verify_val(n_attrs, 1, "Attribute::getNumAttrs()", __LINE__, __FILE__);
+
+        // Get and verify the number of attributes at the location specified
+        // by a file's attribute
+        n_attrs = 0;
+        n_attrs = fattr1.getNumAttrs();
+        verify_val(n_attrs, 2, "Attribute::getNumAttrs()", __LINE__, __FILE__);
+
         // Read back attribute's data
         HDmemset(rdata, 0, sizeof(rdata));
         dattr.read(PredType::NATIVE_INT, rdata);