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@@ -0,0 +1,510 @@
+//  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
+//  Use, modification and distribution are 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).
+//
+//  See http://www.boost.org/libs/utility for most recent version including documentation.
+//  see libs/utility/compressed_pair.hpp
+//
+/* Release notes:
+   20 Jan 2001:
+        Fixed obvious bugs (David Abrahams)
+   07 Oct 2000:
+      Added better single argument constructor support.
+   03 Oct 2000:
+      Added VC6 support (JM).
+   23rd July 2000:
+      Additional comments added. (JM)
+   Jan 2000:
+      Original version: this version crippled for use with crippled compilers
+      - John Maddock Jan 2000.
+*/
+
+
+#ifndef BOOST_OB_COMPRESSED_PAIR_HPP
+#define BOOST_OB_COMPRESSED_PAIR_HPP
+
+#include <algorithm>
+#ifndef BOOST_OBJECT_TYPE_TRAITS_HPP
+#include <boost/type_traits/object_traits.hpp>
+#endif
+#ifndef BOOST_SAME_TRAITS_HPP
+#include <boost/type_traits/same_traits.hpp>
+#endif
+#ifndef BOOST_CALL_TRAITS_HPP
+#include <boost/call_traits.hpp>
+#endif
+
+namespace boost
+{
+#ifdef BOOST_MSVC6_MEMBER_TEMPLATES
+//
+// use member templates to emulate
+// partial specialisation.  Note that due to
+// problems with overload resolution with VC6
+// each of the compressed_pair versions that follow
+// have one template single-argument constructor
+// in place of two specific constructors:
+//
+
+template <class T1, class T2>
+class compressed_pair;
+
+namespace detail{
+
+template <class A, class T1, class T2>
+struct best_conversion_traits
+{
+   typedef char one;
+   typedef char (&two)[2];
+   static A a;
+   static one test(T1);
+   static two test(T2);
+
+   enum { value = sizeof(test(a)) };
+};
+
+template <int>
+struct init_one;
+
+template <>
+struct init_one<1>
+{
+   template <class A, class T1, class T2>
+   static void init(const A& a, T1* p1, T2*)
+   {
+      *p1 = a;
+   }
+};
+
+template <>
+struct init_one<2>
+{
+   template <class A, class T1, class T2>
+   static void init(const A& a, T1*, T2* p2)
+   {
+      *p2 = a;
+   }
+};
+
+
+// T1 != T2, both non-empty
+template <class T1, class T2>
+class compressed_pair_0
+{
+private:
+   T1 _first;
+   T2 _second;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_0() : _first(), _second() {}
+            compressed_pair_0(first_param_type x, second_param_type y) : _first(x), _second(y) {}
+   template <class A>
+   explicit compressed_pair_0(const A& val)
+   {
+      init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, &_second);
+   }
+   compressed_pair_0(const ::boost::compressed_pair<T1,T2>& x)
+      : _first(x.first()), _second(x.second()) {}
+
+#if 0
+  compressed_pair_0& operator=(const compressed_pair_0& x) {
+    cout << "assigning compressed pair 0" << endl;
+    _first = x._first;
+    _second = x._second;
+    cout << "finished assigning compressed pair 0" << endl;
+    return *this;
+  }
+#endif
+
+   first_reference       first()       { return _first; }
+   first_const_reference first() const { return _first; }
+
+   second_reference       second()       { return _second; }
+   second_const_reference second() const { return _second; }
+
+   void swap(compressed_pair_0& y)
+   {
+      using std::swap;
+      swap(_first, y._first);
+      swap(_second, y._second);
+   }
+};
+
+// T1 != T2, T2 empty
+template <class T1, class T2>
+class compressed_pair_1 : T2
+{
+private:
+   T1 _first;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_1() : T2(), _first() {}
+            compressed_pair_1(first_param_type x, second_param_type y) : T2(y), _first(x) {}
+
+   template <class A>
+   explicit compressed_pair_1(const A& val)
+   {
+      init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, static_cast<T2*>(this));
+   }
+
+   compressed_pair_1(const ::boost::compressed_pair<T1,T2>& x)
+      : T2(x.second()), _first(x.first()) {}
+
+#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
+  // Total weirdness. If the assignment to _first is moved after
+  // the call to the inherited operator=, then this breaks graph/test/graph.cpp
+  // by way of iterator_adaptor.
+  compressed_pair_1& operator=(const compressed_pair_1& x) {
+    _first = x._first;
+    T2::operator=(x);
+    return *this;
+  }
+#endif
+
+   first_reference       first()       { return _first; }
+   first_const_reference first() const { return _first; }
+
+   second_reference       second()       { return *this; }
+   second_const_reference second() const { return *this; }
+
+   void swap(compressed_pair_1& y)
+   {
+      // no need to swap empty base class:
+      using std::swap;
+      swap(_first, y._first);
+   }
+};
+
+// T1 != T2, T1 empty
+template <class T1, class T2>
+class compressed_pair_2 : T1
+{
+private:
+   T2 _second;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_2() : T1(), _second() {}
+            compressed_pair_2(first_param_type x, second_param_type y) : T1(x), _second(y) {}
+   template <class A>
+   explicit compressed_pair_2(const A& val)
+   {
+      init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), &_second);
+   }
+   compressed_pair_2(const ::boost::compressed_pair<T1,T2>& x)
+      : T1(x.first()), _second(x.second()) {}
+
+#if 0
+  compressed_pair_2& operator=(const compressed_pair_2& x) {
+    cout << "assigning compressed pair 2" << endl;
+    T1::operator=(x);
+    _second = x._second;
+    cout << "finished assigning compressed pair 2" << endl;
+    return *this;
+  }
+#endif
+   first_reference       first()       { return *this; }
+   first_const_reference first() const { return *this; }
+
+   second_reference       second()       { return _second; }
+   second_const_reference second() const { return _second; }
+
+   void swap(compressed_pair_2& y)
+   {
+      // no need to swap empty base class:
+      using std::swap;
+      swap(_second, y._second);
+   }
+};
+
+// T1 != T2, both empty
+template <class T1, class T2>
+class compressed_pair_3 : T1, T2
+{
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_3() : T1(), T2() {}
+            compressed_pair_3(first_param_type x, second_param_type y) : T1(x), T2(y) {}
+   template <class A>
+   explicit compressed_pair_3(const A& val)
+   {
+      init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), static_cast<T2*>(this));
+   }
+   compressed_pair_3(const ::boost::compressed_pair<T1,T2>& x)
+      : T1(x.first()), T2(x.second()) {}
+
+   first_reference       first()       { return *this; }
+   first_const_reference first() const { return *this; }
+
+   second_reference       second()       { return *this; }
+   second_const_reference second() const { return *this; }
+
+   void swap(compressed_pair_3& y)
+   {
+      // no need to swap empty base classes:
+   }
+};
+
+// T1 == T2, and empty
+template <class T1, class T2>
+class compressed_pair_4 : T1
+{
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_4() : T1() {}
+            compressed_pair_4(first_param_type x, second_param_type y) : T1(x), m_second(y) {}
+   // only one single argument constructor since T1 == T2
+   explicit compressed_pair_4(first_param_type x) : T1(x), m_second(x) {}
+   compressed_pair_4(const ::boost::compressed_pair<T1,T2>& x)
+      : T1(x.first()), m_second(x.second()) {}
+
+   first_reference       first()       { return *this; }
+   first_const_reference first() const { return *this; }
+
+   second_reference       second()       { return m_second; }
+   second_const_reference second() const { return m_second; }
+
+   void swap(compressed_pair_4& y)
+   {
+      // no need to swap empty base classes:
+   }
+private:
+   T2 m_second;
+};
+
+// T1 == T2, not empty
+template <class T1, class T2>
+class compressed_pair_5
+{
+private:
+   T1 _first;
+   T2 _second;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair_5() : _first(), _second() {}
+            compressed_pair_5(first_param_type x, second_param_type y) : _first(x), _second(y) {}
+   // only one single argument constructor since T1 == T2
+   explicit compressed_pair_5(first_param_type x) : _first(x), _second(x) {}
+   compressed_pair_5(const ::boost::compressed_pair<T1,T2>& c) 
+      : _first(c.first()), _second(c.second()) {}
+
+   first_reference       first()       { return _first; }
+   first_const_reference first() const { return _first; }
+
+   second_reference       second()       { return _second; }
+   second_const_reference second() const { return _second; }
+
+   void swap(compressed_pair_5& y)
+   {
+      using std::swap;
+      swap(_first, y._first);
+      swap(_second, y._second);
+   }
+};
+
+template <bool e1, bool e2, bool same>
+struct compressed_pair_chooser
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_0<T1, T2> type;
+   };
+};
+
+template <>
+struct compressed_pair_chooser<false, true, false>
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_1<T1, T2> type;
+   };
+};
+
+template <>
+struct compressed_pair_chooser<true, false, false>
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_2<T1, T2> type;
+   };
+};
+
+template <>
+struct compressed_pair_chooser<true, true, false>
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_3<T1, T2> type;
+   };
+};
+
+template <>
+struct compressed_pair_chooser<true, true, true>
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_4<T1, T2> type;
+   };
+};
+
+template <>
+struct compressed_pair_chooser<false, false, true>
+{
+   template <class T1, class T2>
+   struct rebind
+   {
+      typedef compressed_pair_5<T1, T2> type;
+   };
+};
+
+template <class T1, class T2>
+struct compressed_pair_traits
+{
+private:
+   typedef compressed_pair_chooser<is_empty<T1>::value, is_empty<T2>::value, is_same<T1,T2>::value> chooser;
+   typedef typename chooser::template rebind<T1, T2> bound_type;
+public:
+   typedef typename bound_type::type type;
+};
+
+} // namespace detail
+
+template <class T1, class T2>
+class compressed_pair : public detail::compressed_pair_traits<T1, T2>::type
+{
+private:
+   typedef typename detail::compressed_pair_traits<T1, T2>::type base_type;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair() : base_type() {}
+            compressed_pair(first_param_type x, second_param_type y) : base_type(x, y) {}
+   template <class A>
+   explicit compressed_pair(const A& x) : base_type(x){}
+
+   first_reference       first()       { return base_type::first(); }
+   first_const_reference first() const { return base_type::first(); }
+
+   second_reference       second()       { return base_type::second(); }
+   second_const_reference second() const { return base_type::second(); }
+};
+
+template <class T1, class T2>
+inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
+{
+   x.swap(y);
+}
+
+#else
+// no partial specialisation, no member templates:
+
+template <class T1, class T2>
+class compressed_pair
+{
+private:
+   T1 _first;
+   T2 _second;
+public:
+   typedef T1                                                 first_type;
+   typedef T2                                                 second_type;
+   typedef typename call_traits<first_type>::param_type       first_param_type;
+   typedef typename call_traits<second_type>::param_type      second_param_type;
+   typedef typename call_traits<first_type>::reference        first_reference;
+   typedef typename call_traits<second_type>::reference       second_reference;
+   typedef typename call_traits<first_type>::const_reference  first_const_reference;
+   typedef typename call_traits<second_type>::const_reference second_const_reference;
+
+            compressed_pair() : _first(), _second() {}
+            compressed_pair(first_param_type x, second_param_type y) : _first(x), _second(y) {}
+   explicit compressed_pair(first_param_type x) : _first(x), _second() {}
+   // can't define this in case T1 == T2:
+   // explicit compressed_pair(second_param_type y) : _first(), _second(y) {}
+
+   first_reference       first()       { return _first; }
+   first_const_reference first() const { return _first; }
+
+   second_reference       second()       { return _second; }
+   second_const_reference second() const { return _second; }
+
+   void swap(compressed_pair& y)
+   {
+      using std::swap;
+      swap(_first, y._first);
+      swap(_second, y._second);
+   }
+};
+
+template <class T1, class T2>
+inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
+{
+   x.swap(y);
+}
+
+#endif
+
+} // boost
+
+#endif // BOOST_OB_COMPRESSED_PAIR_HPP
+
+
+