整理

2026-03-23 20:54:41 +08:00
commit e13b3650e9
4596 changed files with 1015768 additions and 0 deletions
--- a/include/boost/range/adaptor/transformed.hpp
+++ b/include/boost/range/adaptor/transformed.hpp
@@ -0,0 +1,137 @@
+// Boost.Range library
+//
+//  Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and
+//  distribution is subject to 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#ifndef BOOST_RANGE_ADAPTOR_TRANSFORMED_HPP
+#define BOOST_RANGE_ADAPTOR_TRANSFORMED_HPP
+
+#include <boost/range/adaptor/argument_fwd.hpp>
+#include <boost/range/detail/default_constructible_unary_fn.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/iterator/transform_iterator.hpp>
+#include <boost/utility/result_of.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+        // A type generator to produce the transform_iterator type conditionally
+        // including a wrapped predicate as appropriate.
+        template<typename P, typename It>
+        struct transform_iterator_gen
+        {
+            typedef transform_iterator<
+                typename default_constructible_unary_fn_gen<
+                    P,
+                    typename transform_iterator<P, It>::reference
+                >::type,
+                It
+            > type;
+        };
+
+        template< class F, class R >
+        struct transformed_range :
+            public boost::iterator_range<
+                typename transform_iterator_gen<
+                    F, typename range_iterator<R>::type>::type>
+        {
+        private:
+            typedef typename transform_iterator_gen<
+                F, typename range_iterator<R>::type>::type transform_iter_t;
+
+            typedef boost::iterator_range<transform_iter_t> base;
+
+        public:
+            typedef typename default_constructible_unary_fn_gen<
+                F,
+                typename transform_iterator<
+                    F,
+                    typename range_iterator<R>::type
+                >::reference
+            >::type transform_fn_type;
+
+            typedef R source_range_type;
+
+            transformed_range(transform_fn_type f, R& r)
+                : base(transform_iter_t(boost::begin(r), f),
+                       transform_iter_t(boost::end(r), f))
+            {
+            }
+        };
+
+        template< class T >
+        struct transform_holder : holder<T>
+        {
+            transform_holder( T r ) : holder<T>(r)
+            {
+            }
+        };
+
+        template< class SinglePassRange, class UnaryFunction >
+        inline transformed_range<UnaryFunction,SinglePassRange>
+        operator|( SinglePassRange& r,
+                   const transform_holder<UnaryFunction>& f )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<SinglePassRange>));
+
+            return transformed_range<UnaryFunction,SinglePassRange>( f.val, r );
+        }
+
+        template< class SinglePassRange, class UnaryFunction >
+        inline transformed_range<UnaryFunction, const SinglePassRange>
+        operator|( const SinglePassRange& r,
+                   const transform_holder<UnaryFunction>& f )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<const SinglePassRange>));
+
+           return transformed_range<UnaryFunction, const SinglePassRange>(
+               f.val, r);
+        }
+
+    } // 'range_detail'
+
+    using range_detail::transformed_range;
+
+    namespace adaptors
+    {
+        namespace
+        {
+            const range_detail::forwarder<range_detail::transform_holder>
+                    transformed =
+                      range_detail::forwarder<range_detail::transform_holder>();
+        }
+
+        template<class UnaryFunction, class SinglePassRange>
+        inline transformed_range<UnaryFunction, SinglePassRange>
+        transform(SinglePassRange& rng, UnaryFunction fn)
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<SinglePassRange>));
+
+            return transformed_range<UnaryFunction, SinglePassRange>(fn, rng);
+        }
+
+        template<class UnaryFunction, class SinglePassRange>
+        inline transformed_range<UnaryFunction, const SinglePassRange>
+        transform(const SinglePassRange& rng, UnaryFunction fn)
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                SinglePassRangeConcept<const SinglePassRange>));
+
+            return transformed_range<UnaryFunction, const SinglePassRange>(
+                fn, rng);
+        }
+    } // 'adaptors'
+
+}
+
+#endif