diff options
Diffstat (limited to 'boost/range/adaptor/replaced.hpp')
-rw-r--r-- | boost/range/adaptor/replaced.hpp | 87 |
1 files changed, 61 insertions, 26 deletions
diff --git a/boost/range/adaptor/replaced.hpp b/boost/range/adaptor/replaced.hpp index deeb8da072..1950b82946 100644 --- a/boost/range/adaptor/replaced.hpp +++ b/boost/range/adaptor/replaced.hpp @@ -17,8 +17,10 @@ #include <boost/range/begin.hpp> #include <boost/range/end.hpp> #include <boost/range/value_type.hpp> +#include <boost/range/concepts.hpp> #include <boost/iterator/iterator_adaptor.hpp> #include <boost/iterator/transform_iterator.hpp> +#include <boost/optional/optional.hpp> namespace boost { @@ -31,19 +33,36 @@ namespace boost typedef const Value& result_type; typedef const Value& first_argument_type; + // Rationale: + // The default constructor is required to allow the transform + // iterator to properly model the iterator concept. + replace_value() + { + } + replace_value(const Value& from, const Value& to) - : m_from(from), m_to(to) + : m_impl(data(from, to)) { } const Value& operator()(const Value& x) const { - return (x == m_from) ? m_to : x; + return (x == m_impl->m_from) ? m_impl->m_to : x; } private: - Value m_from; - Value m_to; + struct data + { + data(const Value& from, const Value& to) + : m_from(from) + , m_to(to) + { + } + + Value m_from; + Value m_to; + }; + boost::optional<data> m_impl; }; template< class R > @@ -82,20 +101,30 @@ namespace boost void operator=(const replace_holder&); }; - template< class InputRng > - inline replaced_range<InputRng> - operator|( InputRng& r, - const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f ) + template< class SinglePassRange > + inline replaced_range<SinglePassRange> + operator|( + SinglePassRange& r, + const replace_holder< + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type>& f ) { - return replaced_range<InputRng>(r, f.val1, f.val2); + BOOST_RANGE_CONCEPT_ASSERT(( + SinglePassRangeConcept<SinglePassRange>)); + + return replaced_range<SinglePassRange>(r, f.val1, f.val2); } - template< class InputRng > - inline replaced_range<const InputRng> - operator|( const InputRng& r, - const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f ) + template< class SinglePassRange > + inline replaced_range<const SinglePassRange> + operator|( + const SinglePassRange& r, + const replace_holder< + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type>& f) { - return replaced_range<const InputRng>(r, f.val1, f.val2); + BOOST_RANGE_CONCEPT_ASSERT(( + SinglePassRangeConcept<const SinglePassRange>)); + + return replaced_range<const SinglePassRange>(r, f.val1, f.val2); } } // 'range_detail' @@ -110,22 +139,28 @@ namespace boost range_detail::forwarder2<range_detail::replace_holder>(); } - template<class InputRange> - inline replaced_range<InputRange> - replace(InputRange& rng, - BOOST_DEDUCED_TYPENAME range_value<InputRange>::type from, - BOOST_DEDUCED_TYPENAME range_value<InputRange>::type to) + template<class SinglePassRange> + inline replaced_range<SinglePassRange> + replace(SinglePassRange& rng, + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type from, + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type to) { - return replaced_range<InputRange>(rng, from, to); + BOOST_RANGE_CONCEPT_ASSERT(( + SinglePassRangeConcept<SinglePassRange>)); + + return replaced_range<SinglePassRange>(rng, from, to); } - template<class InputRange> - inline replaced_range<const InputRange> - replace(const InputRange& rng, - BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type from, - BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type to) + template<class SinglePassRange> + inline replaced_range<const SinglePassRange> + replace(const SinglePassRange& rng, + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type from, + BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type to) { - return replaced_range<const InputRange>(rng, from ,to); + BOOST_RANGE_CONCEPT_ASSERT(( + SinglePassRangeConcept<const SinglePassRange>)); + + return replaced_range<const SinglePassRange>(rng, from ,to); } } // 'adaptors' |