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Class no_slots_error

boost::signals2::no_slots_error — Indicates a combiner was unable to synthesize a return value.


// In header: <boost/signals2/last_value.hpp>

class no_slots_error : public std::exception {
  virtual const char *  what() const;


The no_slots_error exception may be thrown by last_value when it is run but unable to obtain any results from its input iterators.
virtual const char *  what() const;