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boost::signals2::last_value — Evaluate an InputIterator sequence and return the last value in the sequence.
// In header: <boost/signals2/last_value.hpp> template<typename T> class last_value { public: // types typedef T result_type; // invocation template<typename InputIterator> result_type operator()(InputIterator, InputIterator) const; };
            The last_value class was the default Combiner template parameter
            type for signals in the original Signals library.
            Signals2 uses optional_last_value as the default, which
            does not throw.
          
last_value invocationtemplate<typename InputIterator> result_type operator()(InputIterator first, InputIterator last) const;
| Effects: | Attempts to dereference every iterator in the sequence  | 
| Returns: | The result of the last successful iterator dereference. | 
| Throws: | no_slots_error if no iterators were successfully dereferenced,
            unless the template type of  |