author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 02:56:42 +0300 | |
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// (C) Copyright David Abrahams 2002. |
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// (C) Copyright Jeremy Siek 2002. |
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// (C) Copyright Thomas Witt 2002. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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#ifndef BOOST_TRANSFORM_ITERATOR_23022003THW_HPP |
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#define BOOST_TRANSFORM_ITERATOR_23022003THW_HPP |
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#include <boost/function.hpp> |
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#include <boost/iterator.hpp> |
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#include <boost/iterator/detail/enable_if.hpp> |
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#include <boost/iterator/iterator_adaptor.hpp> |
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#include <boost/iterator/iterator_categories.hpp> |
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#include <boost/mpl/not.hpp> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/type_traits/function_traits.hpp> |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/type_traits/is_class.hpp> |
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#include <boost/type_traits/is_function.hpp> |
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#include <boost/type_traits/is_reference.hpp> |
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#include <boost/type_traits/remove_const.hpp> |
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#include <boost/type_traits/remove_reference.hpp> |
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#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310)) |
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# include <boost/type_traits/is_base_and_derived.hpp> |
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#endif |
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#include <boost/iterator/detail/config_def.hpp> |
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namespace boost |
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{ |
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template <class UnaryFunction, class Iterator, class Reference = use_default, class Value = use_default> |
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class transform_iterator; |
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namespace detail |
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{ |
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template <class UnaryFunction> |
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struct function_object_result |
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{ |
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typedef typename UnaryFunction::result_type type; |
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}; |
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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template <class Return, class Argument> |
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struct function_object_result<Return(*)(Argument)> |
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{ |
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typedef Return type; |
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}; |
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#endif |
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// Compute the iterator_adaptor instantiation to be used for transform_iterator |
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template <class UnaryFunction, class Iterator, class Reference, class Value> |
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struct transform_iterator_base |
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{ |
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private: |
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// By default, dereferencing the iterator yields the same as |
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// the function. Do we need to adjust the way |
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// function_object_result is computed for the standard |
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// proposal (e.g. using Doug's result_of)? |
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typedef typename ia_dflt_help< |
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Reference |
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, function_object_result<UnaryFunction> |
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>::type reference; |
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// To get the default for Value: remove any reference on the |
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// result type, but retain any constness to signal |
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// non-writability. Note that if we adopt Thomas' suggestion |
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// to key non-writability *only* on the Reference argument, |
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// we'd need to strip constness here as well. |
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typedef typename ia_dflt_help< |
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Value |
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, remove_reference<reference> |
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>::type cv_value_type; |
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public: |
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typedef iterator_adaptor< |
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transform_iterator<UnaryFunction, Iterator, Reference, Value> |
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, Iterator |
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, cv_value_type |
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, use_default // Leave the traversal category alone |
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, reference |
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> type; |
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}; |
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} |
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template <class UnaryFunction, class Iterator, class Reference, class Value> |
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class transform_iterator |
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: public detail::transform_iterator_base<UnaryFunction, Iterator, Reference, Value>::type |
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{ |
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typedef typename |
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detail::transform_iterator_base<UnaryFunction, Iterator, Reference, Value>::type |
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super_t; |
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friend class iterator_core_access; |
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public: |
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transform_iterator() { } |
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transform_iterator(Iterator const& x, UnaryFunction f) |
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: super_t(x), m_f(f) { } |
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explicit transform_iterator(Iterator const& x) |
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: super_t(x) |
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{ |
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// Pro8 is a little too aggressive about instantiating the |
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// body of this function. |
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#if !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) |
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// don't provide this constructor if UnaryFunction is a |
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// function pointer type, since it will be 0. Too dangerous. |
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BOOST_STATIC_ASSERT(is_class<UnaryFunction>::value); |
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#endif |
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} |
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template< |
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class OtherUnaryFunction |
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, class OtherIterator |
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, class OtherReference |
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, class OtherValue> |
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transform_iterator( |
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transform_iterator<OtherUnaryFunction, OtherIterator, OtherReference, OtherValue> const& t |
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, typename enable_if_convertible<OtherIterator, Iterator>::type* = 0 |
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#if !BOOST_WORKAROUND(BOOST_MSVC, == 1310) |
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, typename enable_if_convertible<OtherUnaryFunction, UnaryFunction>::type* = 0 |
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#endif |
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) |
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: super_t(t.base()), m_f(t.functor()) |
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{} |
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|
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UnaryFunction functor() const |
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{ return m_f; } |
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134 |
|
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private: |
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typename super_t::reference dereference() const |
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{ return m_f(*this->base()); } |
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|
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// Probably should be the initial base class so it can be |
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// optimized away via EBO if it is an empty class. |
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UnaryFunction m_f; |
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}; |
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|
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template <class UnaryFunction, class Iterator> |
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transform_iterator<UnaryFunction, Iterator> |
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make_transform_iterator(Iterator it, UnaryFunction fun) |
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{ |
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return transform_iterator<UnaryFunction, Iterator>(it, fun); |
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} |
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|
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// Version which allows explicit specification of the UnaryFunction |
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// type. |
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// |
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// This generator is not provided if UnaryFunction is a function |
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// pointer type, because it's too dangerous: the default-constructed |
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// function pointer in the iterator be 0, leading to a runtime |
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// crash. |
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template <class UnaryFunction, class Iterator> |
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
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typename mpl::if_< |
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#else |
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typename iterators::enable_if< |
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#endif |
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is_class<UnaryFunction> // We should probably find a cheaper test than is_class<> |
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, transform_iterator<UnaryFunction, Iterator> |
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
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, int[3] |
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#endif |
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>::type |
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make_transform_iterator(Iterator it) |
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{ |
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return transform_iterator<UnaryFunction, Iterator>(it, UnaryFunction()); |
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} |
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|
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) |
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template <class Return, class Argument, class Iterator> |
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transform_iterator< Return (*)(Argument), Iterator, Return> |
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make_transform_iterator(Iterator it, Return (*fun)(Argument)) |
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{ |
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return transform_iterator<Return (*)(Argument), Iterator, Return>(it, fun); |
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} |
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#endif |
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} // namespace boost |
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#include <boost/iterator/detail/config_undef.hpp> |
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#endif // BOOST_TRANSFORM_ITERATOR_23022003THW_HPP |