author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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// (C) Copyright Jeremy Siek 2001. |
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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_SHADOW_ITERATOR_HPP |
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#define BOOST_SHADOW_ITERATOR_HPP |
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#include <boost/iterator_adaptors.hpp> |
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#include <boost/operators.hpp> |
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namespace boost { |
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namespace detail { |
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template <class A, class B, class D> |
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class shadow_proxy |
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: boost::operators< shadow_proxy<A,B,D> > |
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{ |
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typedef shadow_proxy self; |
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public: |
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inline shadow_proxy(A aa, B bb) : a(aa), b(bb) { } |
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inline shadow_proxy(const self& x) : a(x.a), b(x.b) { } |
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template <class Self> |
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inline shadow_proxy(Self x) : a(x.a), b(x.b) { } |
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inline self& operator=(const self& x) { a = x.a; b = x.b; return *this; } |
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inline self& operator++() { ++a; return *this; } |
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inline self& operator--() { --a; return *this; } |
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inline self& operator+=(const self& x) { a += x.a; return *this; } |
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inline self& operator-=(const self& x) { a -= x.a; return *this; } |
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inline self& operator*=(const self& x) { a *= x.a; return *this; } |
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inline self& operator/=(const self& x) { a /= x.a; return *this; } |
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inline self& operator%=(const self& x) { return *this; } // JGS |
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inline self& operator&=(const self& x) { return *this; } // JGS |
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inline self& operator|=(const self& x) { return *this; } // JGS |
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inline self& operator^=(const self& x) { return *this; } // JGS |
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inline friend D operator-(const self& x, const self& y) { |
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return x.a - y.a; |
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} |
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inline bool operator==(const self& x) const { return a == x.a; } |
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inline bool operator<(const self& x) const { return a < x.a; } |
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// protected: |
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A a; |
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B b; |
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}; |
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struct shadow_iterator_policies |
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{ |
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template <typename iter_pair> |
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void initialize(const iter_pair&) { } |
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template <typename Iter> |
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typename Iter::reference dereference(const Iter& i) const { |
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typedef typename Iter::reference R; |
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return R(*i.base().first, *i.base().second); |
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} |
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template <typename Iter> |
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bool equal(const Iter& p1, const Iter& p2) const { |
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return p1.base().first == p2.base().first; |
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} |
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template <typename Iter> |
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void increment(Iter& i) { ++i.base().first; ++i.base().second; } |
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template <typename Iter> |
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void decrement(Iter& i) { --i.base().first; --i.base().second; } |
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template <typename Iter> |
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bool less(const Iter& x, const Iter& y) const { |
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return x.base().first < y.base().first; |
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} |
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template <typename Iter> |
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typename Iter::difference_type |
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distance(const Iter& x, const Iter& y) const { |
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return y.base().first - x.base().first; |
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} |
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template <typename D, typename Iter> |
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void advance(Iter& p, D n) { p.base().first += n; p.base().second += n; } |
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}; |
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} // namespace detail |
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template <typename IterA, typename IterB> |
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struct shadow_iterator_generator { |
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// To use the iterator_adaptor we can't derive from |
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// random_access_iterator because we don't have a real reference. |
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// However, we want the STL algorithms to treat the shadow |
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// iterator like a random access iterator. |
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struct shadow_iterator_tag : public std::input_iterator_tag { |
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operator std::random_access_iterator_tag() { |
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return std::random_access_iterator_tag(); |
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}; |
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}; |
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typedef typename std::iterator_traits<IterA>::value_type Aval; |
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typedef typename std::iterator_traits<IterB>::value_type Bval; |
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typedef typename std::iterator_traits<IterA>::reference Aref; |
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typedef typename std::iterator_traits<IterB>::reference Bref; |
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typedef typename std::iterator_traits<IterA>::difference_type D; |
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typedef detail::shadow_proxy<Aval,Bval,Aval> V; |
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typedef detail::shadow_proxy<Aref,Bref,Aval> R; |
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typedef iterator_adaptor< std::pair<IterA, IterB>, |
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detail::shadow_iterator_policies, |
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V, R, V*, shadow_iterator_tag, |
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D> type; |
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}; |
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106 |
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// short cut for creating a shadow iterator |
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template <class IterA, class IterB> |
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inline typename shadow_iterator_generator<IterA,IterB>::type |
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make_shadow_iter(IterA a, IterB b) { |
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typedef typename shadow_iterator_generator<IterA,IterB>::type Iter; |
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return Iter(std::make_pair(a,b)); |
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} |
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114 |
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template <class Cmp> |
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struct shadow_cmp { |
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inline shadow_cmp(const Cmp& c) : cmp(c) { } |
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template <class ShadowProxy1, class ShadowProxy2> |
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inline bool operator()(const ShadowProxy1& x, const ShadowProxy2& y) const |
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{ |
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return cmp(x.a, y.a); |
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} |
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Cmp cmp; |
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}; |
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} // namespace boost |
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127 |
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namespace std { |
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template <class A1, class B1, class D1, |
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class A2, class B2, class D2> |
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void swap(boost::detail::shadow_proxy<A1&,B1&,D1> x, |
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boost::detail::shadow_proxy<A2&,B2&,D2> y) |
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{ |
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std::swap(x.a, y.a); |
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std::swap(x.b, y.b); |
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} |
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} |
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#endif // BOOST_SHADOW_ITERATOR_HPP |