forked from boostorg/utility
511 lines
16 KiB
C++
511 lines
16 KiB
C++
// (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
|
|
|
|
|
|
|