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-// (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
-
-
-
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