imgtools/imglib/boostlibrary/boost/detail/compressed_pair.hpp
author Daniel Jacobs <daniel.jacobs@nokia.com>
Fri, 07 May 2010 15:52:14 +0100
branchfix
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permissions -rw-r--r--
Release Note: SF Bug 2605 - [Raptor] ROMFILE creation using Raptor is not clean
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//  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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//  Use, modification and distribution are subject to the Boost Software License,
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//  Version 1.0. (See 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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//
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//  See http://www.boost.org/libs/utility for most recent version including documentation.
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// compressed_pair: pair that "compresses" empty members
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// (see libs/utility/compressed_pair.htm)
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//
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// JM changes 25 Jan 2004:
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// For the case where T1 == T2 and both are empty, then first() and second()
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// should return different objects.
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// JM changes 25 Jan 2000:
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// Removed default arguments from compressed_pair_switch to get
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// C++ Builder 4 to accept them
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// rewriten swap to get gcc and C++ builder to compile.
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// added partial specialisations for case T1 == T2 to avoid duplicate constructor defs.
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#ifndef BOOST_DETAIL_COMPRESSED_PAIR_HPP
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#define BOOST_DETAIL_COMPRESSED_PAIR_HPP
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#include <algorithm>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/is_empty.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/call_traits.hpp>
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable:4512)
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#endif 
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namespace boost
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{
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template <class T1, class T2>
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class compressed_pair;
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// compressed_pair
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namespace details
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{
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   // JM altered 26 Jan 2000:
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   template <class T1, class T2, bool IsSame, bool FirstEmpty, bool SecondEmpty>
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   struct compressed_pair_switch;
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, false, false, false>
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      {static const int value = 0;};
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, false, true, true>
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      {static const int value = 3;};
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, false, true, false>
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      {static const int value = 1;};
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, false, false, true>
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      {static const int value = 2;};
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, true, true, true>
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      {static const int value = 4;};
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   template <class T1, class T2>
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   struct compressed_pair_switch<T1, T2, true, false, false>
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      {static const int value = 5;};
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   template <class T1, class T2, int Version> class compressed_pair_imp;
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#ifdef __GNUC__
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   // workaround for GCC (JM):
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   using std::swap;
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#endif
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   //
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   // can't call unqualified swap from within classname::swap
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   // as Koenig lookup rules will find only the classname::swap
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   // member function not the global declaration, so use cp_swap
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   // as a forwarding function (JM):
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   template <typename T>
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   inline void cp_swap(T& t1, T& t2)
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   {
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#ifndef __GNUC__
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      using std::swap;
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#endif
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      swap(t1, t2);
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   }
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   // 0    derive from neither
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 0>
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {} 
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : first_(x), second_(y) {}
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      compressed_pair_imp(first_param_type x)
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         : first_(x) {}
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      compressed_pair_imp(second_param_type y)
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         : second_(y) {}
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      first_reference       first()       {return first_;}
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      first_const_reference first() const {return first_;}
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      second_reference       second()       {return second_;}
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      second_const_reference second() const {return second_;}
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      void swap(::boost::compressed_pair<T1, T2>& y)
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      {
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         cp_swap(first_, y.first());
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         cp_swap(second_, y.second());
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      }
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   private:
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      first_type first_;
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      second_type second_;
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   };
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   // 1    derive from T1
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 1>
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      : protected ::boost::remove_cv<T1>::type
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {}
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : first_type(x), second_(y) {}
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      compressed_pair_imp(first_param_type x)
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         : first_type(x) {}
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      compressed_pair_imp(second_param_type y)
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         : second_(y) {}
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      first_reference       first()       {return *this;}
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      first_const_reference first() const {return *this;}
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      second_reference       second()       {return second_;}
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      second_const_reference second() const {return second_;}
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      void swap(::boost::compressed_pair<T1,T2>& y)
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      {
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         // no need to swap empty base class:
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         cp_swap(second_, y.second());
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      }
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   private:
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      second_type second_;
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   };
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   // 2    derive from T2
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 2>
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      : protected ::boost::remove_cv<T2>::type
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {}
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : second_type(y), first_(x) {}
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      compressed_pair_imp(first_param_type x)
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         : first_(x) {}
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      compressed_pair_imp(second_param_type y)
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         : second_type(y) {}
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      first_reference       first()       {return first_;}
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      first_const_reference first() const {return first_;}
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      second_reference       second()       {return *this;}
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      second_const_reference second() const {return *this;}
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      void swap(::boost::compressed_pair<T1,T2>& y)
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      {
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         // no need to swap empty base class:
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         cp_swap(first_, y.first());
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      }
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   private:
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      first_type first_;
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   };
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   // 3    derive from T1 and T2
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 3>
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      : protected ::boost::remove_cv<T1>::type,
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        protected ::boost::remove_cv<T2>::type
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {}
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : first_type(x), second_type(y) {}
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      compressed_pair_imp(first_param_type x)
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         : first_type(x) {}
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      compressed_pair_imp(second_param_type y)
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         : second_type(y) {}
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      first_reference       first()       {return *this;}
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      first_const_reference first() const {return *this;}
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      second_reference       second()       {return *this;}
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      second_const_reference second() const {return *this;}
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      //
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      // no need to swap empty bases:
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      void swap(::boost::compressed_pair<T1,T2>&) {}
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   };
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   // JM
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   // 4    T1 == T2, T1 and T2 both empty
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   //      Originally this did not store an instance of T2 at all
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   //      but that led to problems beause it meant &x.first() == &x.second()
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   //      which is not true for any other kind of pair, so now we store an instance
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   //      of T2 just in case the user is relying on first() and second() returning
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   //      different objects (albeit both empty).
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 4>
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      : protected ::boost::remove_cv<T1>::type
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {}
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : first_type(x), m_second(y) {}
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      compressed_pair_imp(first_param_type x)
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         : first_type(x), m_second(x) {}
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      first_reference       first()       {return *this;}
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      first_const_reference first() const {return *this;}
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      second_reference       second()       {return m_second;}
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      second_const_reference second() const {return m_second;}
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      void swap(::boost::compressed_pair<T1,T2>&) {}
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   private:
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      T2 m_second;
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   };
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   // 5    T1 == T2 and are not empty:   //JM
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   template <class T1, class T2>
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   class compressed_pair_imp<T1, T2, 5>
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   {
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   public:
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      typedef T1                                                 first_type;
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      typedef T2                                                 second_type;
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      typedef typename call_traits<first_type>::param_type       first_param_type;
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      typedef typename call_traits<second_type>::param_type      second_param_type;
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      typedef typename call_traits<first_type>::reference        first_reference;
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      typedef typename call_traits<second_type>::reference       second_reference;
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      typedef typename call_traits<first_type>::const_reference  first_const_reference;
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      typedef typename call_traits<second_type>::const_reference second_const_reference;
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      compressed_pair_imp() {}
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      compressed_pair_imp(first_param_type x, second_param_type y)
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         : first_(x), second_(y) {}
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      compressed_pair_imp(first_param_type x)
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         : first_(x), second_(x) {}
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      first_reference       first()       {return first_;}
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      first_const_reference first() const {return first_;}
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      second_reference       second()       {return second_;}
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      second_const_reference second() const {return second_;}
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      void swap(::boost::compressed_pair<T1, T2>& y)
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      {
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         cp_swap(first_, y.first());
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         cp_swap(second_, y.second());
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      }
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   private:
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      first_type first_;
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      second_type second_;
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   };
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}  // details
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template <class T1, class T2>
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class compressed_pair
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   : private ::boost::details::compressed_pair_imp<T1, T2,
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             ::boost::details::compressed_pair_switch<
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                    T1,
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                    T2,
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                    ::boost::is_same<typename remove_cv<T1>::type, typename remove_cv<T2>::type>::value,
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                    ::boost::is_empty<T1>::value,
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                    ::boost::is_empty<T2>::value>::value>
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{
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private:
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   typedef details::compressed_pair_imp<T1, T2,
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             ::boost::details::compressed_pair_switch<
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                    T1,
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                    T2,
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                    ::boost::is_same<typename remove_cv<T1>::type, typename remove_cv<T2>::type>::value,
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                    ::boost::is_empty<T1>::value,
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                    ::boost::is_empty<T2>::value>::value> base;
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public:
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   358
   typedef T1                                                 first_type;
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   typedef T2                                                 second_type;
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   typedef typename call_traits<first_type>::param_type       first_param_type;
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   typedef typename call_traits<second_type>::param_type      second_param_type;
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   typedef typename call_traits<first_type>::reference        first_reference;
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   typedef typename call_traits<second_type>::reference       second_reference;
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   typedef typename call_traits<first_type>::const_reference  first_const_reference;
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   typedef typename call_traits<second_type>::const_reference second_const_reference;
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   366
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            compressed_pair() : base() {}
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            compressed_pair(first_param_type x, second_param_type y) : base(x, y) {}
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   explicit compressed_pair(first_param_type x) : base(x) {}
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   explicit compressed_pair(second_param_type y) : base(y) {}
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   371
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   372
   first_reference       first()       {return base::first();}
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   first_const_reference first() const {return base::first();}
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   374
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   second_reference       second()       {return base::second();}
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   second_const_reference second() const {return base::second();}
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   377
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   378
   void swap(compressed_pair& y) { base::swap(y); }
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   379
};
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   380
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   381
// JM
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   382
// Partial specialisation for case where T1 == T2:
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   383
//
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   384
template <class T>
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   385
class compressed_pair<T, T>
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   386
   : private details::compressed_pair_imp<T, T,
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   387
             ::boost::details::compressed_pair_switch<
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   388
                    T,
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   389
                    T,
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   390
                    ::boost::is_same<typename remove_cv<T>::type, typename remove_cv<T>::type>::value,
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   391
                    ::boost::is_empty<T>::value,
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   392
                    ::boost::is_empty<T>::value>::value>
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   393
{
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   394
private:
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   395
   typedef details::compressed_pair_imp<T, T,
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   396
             ::boost::details::compressed_pair_switch<
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   397
                    T,
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   398
                    T,
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   399
                    ::boost::is_same<typename remove_cv<T>::type, typename remove_cv<T>::type>::value,
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   400
                    ::boost::is_empty<T>::value,
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   401
                    ::boost::is_empty<T>::value>::value> base;
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   402
public:
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   403
   typedef T                                                  first_type;
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   404
   typedef T                                                  second_type;
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   405
   typedef typename call_traits<first_type>::param_type       first_param_type;
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   406
   typedef typename call_traits<second_type>::param_type      second_param_type;
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   407
   typedef typename call_traits<first_type>::reference        first_reference;
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   408
   typedef typename call_traits<second_type>::reference       second_reference;
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   409
   typedef typename call_traits<first_type>::const_reference  first_const_reference;
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   410
   typedef typename call_traits<second_type>::const_reference second_const_reference;
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diff changeset
   411
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   412
            compressed_pair() : base() {}
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diff changeset
   413
            compressed_pair(first_param_type x, second_param_type y) : base(x, y) {}
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   414
#if !(defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x530))
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   415
   explicit 
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   416
#endif
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   417
      compressed_pair(first_param_type x) : base(x) {}
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   418
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   419
   first_reference       first()       {return base::first();}
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   420
   first_const_reference first() const {return base::first();}
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   421
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   422
   second_reference       second()       {return base::second();}
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   423
   second_const_reference second() const {return base::second();}
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   424
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   425
   void swap(::boost::compressed_pair<T,T>& y) { base::swap(y); }
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   426
};
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diff changeset
   427
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   428
template <class T1, class T2>
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   429
inline
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diff changeset
   430
void
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   431
swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
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{
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   x.swap(y);
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}
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} // boost
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif 
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#endif // BOOST_DETAIL_COMPRESSED_PAIR_HPP
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