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95 lines
2.9 KiB
95 lines
2.9 KiB
// Boost.Signals library |
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// Copyright Douglas Gregor 2001-2004. Use, modification and |
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// distribution is subject to the Boost Software License, Version |
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// For more information, see http://www.boost.org |
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#ifndef BOOST_SIGNALS_SLOT_CALL_ITERATOR |
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#define BOOST_SIGNALS_SLOT_CALL_ITERATOR |
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#include <memory> |
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#include <boost/iterator/iterator_facade.hpp> |
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#include <boost/smart_ptr.hpp> |
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#include <boost/signals/detail/config.hpp> |
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#include <boost/signals/connection.hpp> |
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#include <boost/optional.hpp> |
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#ifdef BOOST_HAS_ABI_HEADERS |
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# include BOOST_ABI_PREFIX |
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#endif |
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namespace boost { |
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namespace BOOST_SIGNALS_NAMESPACE { |
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namespace detail { |
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// Generates a slot call iterator. Essentially, this is an iterator that: |
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// - skips over disconnected slots in the underlying list |
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// - calls the connected slots when dereferenced |
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// - caches the result of calling the slots |
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template<typename Function, typename Iterator> |
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class slot_call_iterator |
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: public iterator_facade<slot_call_iterator<Function, Iterator>, |
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typename Function::result_type, |
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single_pass_traversal_tag, |
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typename Function::result_type const&> |
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{ |
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typedef iterator_facade<slot_call_iterator<Function, Iterator>, |
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typename Function::result_type, |
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single_pass_traversal_tag, |
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typename Function::result_type const&> |
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inherited; |
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typedef typename Function::result_type result_type; |
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friend class iterator_core_access; |
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public: |
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slot_call_iterator(Iterator iter_in, Iterator end_in, Function func, |
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optional<result_type> &c) |
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: iter(iter_in), end(end_in), f(func), cache(&c) |
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{ |
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iter = std::find_if(iter, end, is_callable()); |
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} |
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typename inherited::reference |
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dereference() const |
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{ |
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if (!cache->is_initialized()) { |
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cache->reset(f(*iter)); |
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} |
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return cache->get(); |
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} |
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void increment() |
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{ |
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iter = std::find_if(++iter, end, is_callable()); |
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cache->reset(); |
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} |
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bool equal(const slot_call_iterator& other) const |
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{ |
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iter = std::find_if(iter, end, is_callable()); |
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other.iter = std::find_if(other.iter, other.end, |
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is_callable()); |
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return iter == other.iter; |
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} |
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private: |
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mutable Iterator iter; |
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Iterator end; |
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Function f; |
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optional<result_type>* cache; |
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}; |
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} // end namespace detail |
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} // end namespace BOOST_SIGNALS_NAMESPACE |
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} // end namespace boost |
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#ifdef BOOST_HAS_ABI_HEADERS |
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# include BOOST_ABI_SUFFIX |
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#endif |
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#endif // BOOST_SIGNALS_SLOT_CALL_ITERATOR
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