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/*!
\addtogroup Val Validation
\page ValidationOverview Validation module
\ref Val classes provide support for writing and running different validation checks.
Most of the core classes are put to wb_validation.h header file.
Class \ref val::AtomBase is a type of interface class, allows to execute atomic
validation checks for specific type. \ref AtomBase is used in class
\ref Chain for storing pointers to actual checks in vector. Actual check
is a template class \ref Atom, see below. \ref AtomBase serves as a layer between
code which is called for each particular type. Let's consider that we need
to have two checks to be stored in chain:
\code
Class ValidatorSyntax
{
public:
void do_check(const db_Column& c)
};
Class ValidatorLogic
{
public:
void do_check(const db_Column& c)
};
\endcode
so we can not have a generic algorithm to apply these checks as we have
different objects-validators
we can not add:
Chain->add(ValidatorSyntax(), &ValidatorSyntax::do_check);
Chain->add(ValidatorLogic(), &ValidatorLogic::do_check);
but we can hide object and method in parameters and pass only argument to those
So AtomBase introduces a way to pass object in generic way, while class Atom
hides object and its method to run that check
*/
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