APIs (Multiple Languages)
=========================

Looking up a DataReader using the wrong class in Modern C++ or Python did not raise clear exception
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In Modern C++, when using the ``find_datareader_by_topic_name`` or
``find_datawriter_by_topic_name`` functions and the wrong *DataReader* type,
the function may have returned an invalid entity. Now, it will throw a
``dds::core::InvalidArgumentError``. For example:

.. code:: c++

   auto dr =
       rti::sub::find_datareader_by_topic_name<DataReader<Foo>>(
       dds::sub::builtin_subscriber(participant),
       dds::topic::publication_topic_name());

In Python, the following code now throws a ``dds.InvalidArgumentError``:

.. code:: python

   dr = dds.DataReader.find_by_topic(
              participant.builtin_subscriber, dds.PublicationBuiltinTopicData.topic_name)

since the right DataReader class for the built-in
``PublicationBuiltinTopicData`` reader is
``dds.PublicationBuiltinTopicData.DataReader``, not ``dds.DataReader``.


[RTI Issue ID CORE-13800]


Alias type not obtainable using a QosProvider
---------------------------------------------
Alias types were not obtainable using a QosProvider. This problem
affected all language bindings that support a QosProvider. 
This problem has been fixed.


[RTI Issue ID CORE-13830]