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from_failure_handler — Type of assertion failure handler functions (with from parameter). 
// In header: <boost/contract/core/exception.hpp> typedef boost::function< void(from)> from_failure_handler;
Assertion failure handler functions specified by this type must be functors returning void and taking a single parameter of type  boost::contract::from. For example, this is used to specify contract failure handlers for class invariants, preconditions, postconditions, and exception guarantees.
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