You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
510 lines
16 KiB
510 lines
16 KiB
// (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 |
|
|
|
|
|
|
|
|