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## Class template last_value

boost::signals2::last_value — Evaluate an InputIterator sequence and return the last value in the sequence.

## Synopsis

    // 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;
    };

## Description

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` invocation

1.     template<typename InputIterator>
         result_type operator()(InputIterator first, InputIterator last) const;

   Effects: | Attempts to dereference every iterator in the sequence `[first, last)`.
   Returns: | The result of the last successful iterator dereference.
   Throws: | no_slots_error if no iterators were successfully dereferenced, unless the template type of `last_value` is `void`.

### Specializations

- Class last_value<void>