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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/iterator/transform_iterator.hpp
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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_TRANSFORM_ITERATOR_23022003THW_HPP
+#define BOOST_TRANSFORM_ITERATOR_23022003THW_HPP
+
+#include <boost/function.hpp>
+#include <boost/iterator.hpp>
+#include <boost/iterator/detail/enable_if.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+#include <boost/iterator/iterator_categories.hpp>
+#include <boost/mpl/not.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/function_traits.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_class.hpp>
+#include <boost/type_traits/is_function.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310))
+# include <boost/type_traits/is_base_and_derived.hpp>
+
+#endif
+#include <boost/iterator/detail/config_def.hpp>
+
+
+namespace boost
+{
+ template <class UnaryFunction, class Iterator, class Reference = use_default, class Value = use_default>
+ class transform_iterator;
+
+ namespace detail
+ {
+
+ template <class UnaryFunc>
+ struct function_object_result
+ {
+ typedef typename UnaryFunc::result_type type;
+ };
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+ template <class Return, class Argument>
+ struct function_object_result<Return(*)(Argument)>
+ {
+ typedef Return type;
+ };
+#endif
+
+ // Compute the iterator_adaptor instantiation to be used for transform_iterator
+ template <class UnaryFunc, class Iterator, class Reference, class Value>
+ struct transform_iterator_base
+ {
+ private:
+ // By default, dereferencing the iterator yields the same as
+ // the function. Do we need to adjust the way
+ // function_object_result is computed for the standard
+ // proposal (e.g. using Doug's result_of)?
+ typedef typename ia_dflt_help<
+ Reference
+ , function_object_result<UnaryFunc>
+ >::type reference;
+
+ // To get the default for Value: remove any reference on the
+ // result type, but retain any constness to signal
+ // non-writability. Note that if we adopt Thomas' suggestion
+ // to key non-writability *only* on the Reference argument,
+ // we'd need to strip constness here as well.
+ typedef typename ia_dflt_help<
+ Value
+ , remove_reference<reference>
+ >::type cv_value_type;
+
+ public:
+ typedef iterator_adaptor<
+ transform_iterator<UnaryFunc, Iterator, Reference, Value>
+ , Iterator
+ , cv_value_type
+ , use_default // Leave the traversal category alone
+ , reference
+ > type;
+ };
+ }
+
+ template <class UnaryFunc, class Iterator, class Reference, class Value>
+ class transform_iterator
+ : public boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+ {
+ typedef typename
+ boost::detail::transform_iterator_base<UnaryFunc, Iterator, Reference, Value>::type
+ super_t;
+
+ friend class iterator_core_access;
+
+ public:
+ transform_iterator() { }
+
+ transform_iterator(Iterator const& x, UnaryFunc f)
+ : super_t(x), m_f(f) { }
+
+ explicit transform_iterator(Iterator const& x)
+ : super_t(x)
+ {
+ // Pro8 is a little too aggressive about instantiating the
+ // body of this function.
+#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
+ // don't provide this constructor if UnaryFunc is a
+ // function pointer type, since it will be 0. Too dangerous.
+ BOOST_STATIC_ASSERT(is_class<UnaryFunc>::value);
+#endif
+ }
+
+ template<
+ class OtherUnaryFunction
+ , class OtherIterator
+ , class OtherReference
+ , class OtherValue>
+ transform_iterator(
+ transform_iterator<OtherUnaryFunction, OtherIterator, OtherReference, OtherValue> const& t
+ , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310)
+ , typename enable_if_convertible<OtherUnaryFunction, UnaryFunc>::type* = 0
+#endif
+ )
+ : super_t(t.base()), m_f(t.functor())
+ {}
+
+ UnaryFunc functor() const
+ { return m_f; }
+
+ private:
+ typename super_t::reference dereference() const
+ { return m_f(*this->base()); }
+
+ // Probably should be the initial base class so it can be
+ // optimized away via EBO if it is an empty class.
+ UnaryFunc m_f;
+ };
+
+ template <class UnaryFunc, class Iterator>
+ transform_iterator<UnaryFunc, Iterator>
+ make_transform_iterator(Iterator it, UnaryFunc fun)
+ {
+ return transform_iterator<UnaryFunc, Iterator>(it, fun);
+ }
+
+ // Version which allows explicit specification of the UnaryFunc
+ // type.
+ //
+ // This generator is not provided if UnaryFunc is a function
+ // pointer type, because it's too dangerous: the default-constructed
+ // function pointer in the iterator be 0, leading to a runtime
+ // crash.
+ template <class UnaryFunc, class Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+ typename mpl::if_<
+#else
+ typename iterators::enable_if<
+#endif
+ is_class<UnaryFunc> // We should probably find a cheaper test than is_class<>
+ , transform_iterator<UnaryFunc, Iterator>
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+ , int[3]
+#endif
+ >::type
+ make_transform_iterator(Iterator it)
+ {
+ return transform_iterator<UnaryFunc, Iterator>(it, UnaryFunc());
+ }
+
+#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
+ template <class Return, class Argument, class Iterator>
+ transform_iterator< Return (*)(Argument), Iterator, Return>
+ make_transform_iterator(Iterator it, Return (*fun)(Argument))
+ {
+ return transform_iterator<Return (*)(Argument), Iterator, Return>(it, fun);
+ }
+#endif
+
+} // namespace boost
+
+#include <boost/iterator/detail/config_undef.hpp>
+
+#endif // BOOST_TRANSFORM_ITERATOR_23022003THW_HPP