DDS — DDS ISSUE# 25] Addition of read and take to ReadCondition

Ref-60 Adding_read_take_to_ReadCondition

Why not have a read and take operation on readcondition instread of
read_w_condition and take_w_condition?

In the current situation the middleware must perform consistency
checking and handle error conditions.

Moving the read and take to the readCondition will require generation
of typed interfaces but this is merely a wrapper around the current
situation avoiding the error prone design.

For example, if a Waitset has many query conditions. Then the
application would need to find the reader that matches it. Adding a
get_reader in the querycondition would not give a strongly-typed
reader.

The simplest solution is to have a read in the querycondition.

**PROPOSAL**

create the ReadCondition and QueryReadCondition as implied IDL

We will move create_readcondition to the FooDataReader

Add a read to the Read and QueryConditions

Remove the read_w_condition from the DataReader and FooDataReader

see below