...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::signals2::optional_last_value<void> — Evaluate an InputIterator sequence.
// In header: <boost/signals2/optional_last_value.hpp> class optional_last_value<void> { public: // types typedef void result_type; // invocation template<typename InputIterator> result_type operator()(InputIterator, InputIterator) const; };
This specialization of signals2::optional_last_value is provided
to cope with the fact that there is no such thing as an
optional<void>
, which
optional_last_value would otherwise try to
use as its result_type
. This specialization
instead sets the result_type
to be void
.
optional_last_value
invocationtemplate<typename InputIterator> result_type operator()(InputIterator first, InputIterator last) const;
Effects: |
Attempts to dereference every iterator in the sequence |