Squashed 'third_party/boostorg/utility/' content from commit ebe4429
Change-Id: I8e6ee78273db31df18f99d29034f855ccc064551
git-subtree-dir: third_party/boostorg/utility
git-subtree-split: ebe44296ca698e333a09e8268ea8ccedb3886c4d
diff --git a/include/boost/detail/ob_compressed_pair.hpp b/include/boost/detail/ob_compressed_pair.hpp
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+++ b/include/boost/detail/ob_compressed_pair.hpp
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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()) {}
+
+ 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
+
+
+