Avi Kivity 2c3591cbd9 data_value de-any-fication ...

We use boost::any to convert to and from database values (stored in
serlialized form) and native C++ values.  boost::any captures information
about the data type (how to copy/move/delete etc.) and stores it inside
the boost::any instance.  We later retrieve the real value using
boost::any_cast.

However, data_value (which has a boost::any member) already has type
information as a data_type instance.  By teaching data_type intances about
the corresponding native type, we can elimiante the use of boost::any.

While boost::any is evil and eliminating it improves efficiency somewhat,
the real goal is growing native type support in data_type.  We will use that
later to store native types in the cache, enabling O(log n) access to
collections, O(1) access to tuples, and more efficient large blob support.

2015-10-30 17:38:51 +01:00

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