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// (C) Copyright David Abrahams 2002. // (C) Copyright Jeremy Siek 2002. // (C) Copyright Thomas Witt 2002. // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_FILTER_ITERATOR_23022003THW_HPP #define BOOST_FILTER_ITERATOR_23022003THW_HPP #include
#include
#include
#include
#include
namespace boost { template
class filter_iterator; namespace detail { template
struct filter_iterator_base { typedef iterator_adaptor< filter_iterator
, Iterator , use_default , typename mpl::if_< is_convertible< typename iterator_traversal
::type , random_access_traversal_tag > , bidirectional_traversal_tag , use_default >::type > type; }; } template
class filter_iterator : public detail::filter_iterator_base
::type { typedef typename detail::filter_iterator_base< Predicate, Iterator >::type super_t; friend class iterator_core_access; public: filter_iterator() { } filter_iterator(Predicate f, Iterator x, Iterator end_ = Iterator()) : super_t(x), m_predicate(f), m_end(end_) { satisfy_predicate(); } filter_iterator(Iterator x, Iterator end_ = Iterator()) : super_t(x), m_predicate(), m_end(end_) { // Pro8 is a little too aggressive about instantiating the // body of this function. #if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) // Don't allow use of this constructor if Predicate is a // function pointer type, since it will be 0. BOOST_STATIC_ASSERT(is_class
::value); #endif satisfy_predicate(); } template
filter_iterator( filter_iterator
const& t , typename enable_if_convertible
::type* = 0 ) : super_t(t.base()), m_predicate(t.predicate()), m_end(t.end()) {} Predicate predicate() const { return m_predicate; } Iterator end() const { return m_end; } private: void increment() { ++(this->base_reference()); satisfy_predicate(); } void decrement() { while(!this->m_predicate(*--(this->base_reference()))){}; } void satisfy_predicate() { while (this->base() != this->m_end && !this->m_predicate(*this->base())) ++(this->base_reference()); } // Probably should be the initial base class so it can be // optimized away via EBO if it is an empty class. Predicate m_predicate; Iterator m_end; }; template
filter_iterator
make_filter_iterator(Predicate f, Iterator x, Iterator end = Iterator()) { return filter_iterator
(f,x,end); } template
filter_iterator
make_filter_iterator( typename iterators::enable_if< is_class
, Iterator >::type x , Iterator end = Iterator() #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) , Predicate* = 0 #endif ) { return filter_iterator
(x,end); } } // namespace boost #endif // BOOST_FILTER_ITERATOR_23022003THW_HPP
filter_iterator.hpp
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