511 lines
16 KiB
C++
511 lines
16 KiB
C++
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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// See http://www.boost.org/libs/utility for most recent version including documentation.
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// see libs/utility/compressed_pair.hpp
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//
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/* Release notes:
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20 Jan 2001:
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Fixed obvious bugs (David Abrahams)
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07 Oct 2000:
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Added better single argument constructor support.
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03 Oct 2000:
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Added VC6 support (JM).
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23rd July 2000:
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Additional comments added. (JM)
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Jan 2000:
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Original version: this version crippled for use with crippled compilers
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- John Maddock Jan 2000.
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*/
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#ifndef BOOST_OB_COMPRESSED_PAIR_HPP
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#define BOOST_OB_COMPRESSED_PAIR_HPP
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#include <algorithm>
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#ifndef BOOST_OBJECT_TYPE_TRAITS_HPP
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#include <boost/type_traits/object_traits.hpp>
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#endif
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#ifndef BOOST_SAME_TRAITS_HPP
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#include <boost/type_traits/same_traits.hpp>
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#endif
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#ifndef BOOST_CALL_TRAITS_HPP
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#include <boost/call_traits.hpp>
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#endif
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namespace boost
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{
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#ifdef BOOST_MSVC6_MEMBER_TEMPLATES
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//
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// use member templates to emulate
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// partial specialisation. Note that due to
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// problems with overload resolution with VC6
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// each of the compressed_pair versions that follow
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// have one template single-argument constructor
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// in place of two specific constructors:
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//
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template <class T1, class T2>
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class compressed_pair;
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namespace detail{
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template <class A, class T1, class T2>
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struct best_conversion_traits
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{
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typedef char one;
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typedef char (&two)[2];
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static A a;
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static one test(T1);
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static two test(T2);
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enum { value = sizeof(test(a)) };
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};
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template <int>
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struct init_one;
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template <>
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struct init_one<1>
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{
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template <class A, class T1, class T2>
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static void init(const A& a, T1* p1, T2*)
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{
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*p1 = a;
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}
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};
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template <>
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struct init_one<2>
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{
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template <class A, class T1, class T2>
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static void init(const A& a, T1*, T2* p2)
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{
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*p2 = a;
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}
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};
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// T1 != T2, both non-empty
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template <class T1, class T2>
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class compressed_pair_0
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{
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private:
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T1 _first;
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T2 _second;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_0() : _first(), _second() {}
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compressed_pair_0(first_param_type x, second_param_type y) : _first(x), _second(y) {}
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template <class A>
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explicit compressed_pair_0(const A& val)
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{
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init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, &_second);
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}
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compressed_pair_0(const ::boost::compressed_pair<T1,T2>& x)
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: _first(x.first()), _second(x.second()) {}
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#if 0
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compressed_pair_0& operator=(const compressed_pair_0& x) {
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cout << "assigning compressed pair 0" << endl;
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_first = x._first;
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_second = x._second;
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cout << "finished assigning compressed pair 0" << endl;
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return *this;
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}
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#endif
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first_reference first() { return _first; }
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first_const_reference first() const { return _first; }
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second_reference second() { return _second; }
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second_const_reference second() const { return _second; }
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void swap(compressed_pair_0& y)
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{
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using std::swap;
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swap(_first, y._first);
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swap(_second, y._second);
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}
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};
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// T1 != T2, T2 empty
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template <class T1, class T2>
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class compressed_pair_1 : T2
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{
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private:
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T1 _first;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_1() : T2(), _first() {}
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compressed_pair_1(first_param_type x, second_param_type y) : T2(y), _first(x) {}
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template <class A>
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explicit compressed_pair_1(const A& val)
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{
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init_one<best_conversion_traits<A, T1, T2>::value>::init(val, &_first, static_cast<T2*>(this));
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}
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compressed_pair_1(const ::boost::compressed_pair<T1,T2>& x)
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: T2(x.second()), _first(x.first()) {}
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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
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// Total weirdness. If the assignment to _first is moved after
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// the call to the inherited operator=, then this breaks graph/test/graph.cpp
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// by way of iterator_adaptor.
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compressed_pair_1& operator=(const compressed_pair_1& x) {
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_first = x._first;
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T2::operator=(x);
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return *this;
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}
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#endif
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first_reference first() { return _first; }
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first_const_reference first() const { return _first; }
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second_reference second() { return *this; }
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second_const_reference second() const { return *this; }
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void swap(compressed_pair_1& y)
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{
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// no need to swap empty base class:
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using std::swap;
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swap(_first, y._first);
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}
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};
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// T1 != T2, T1 empty
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template <class T1, class T2>
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class compressed_pair_2 : T1
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{
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private:
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T2 _second;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_2() : T1(), _second() {}
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compressed_pair_2(first_param_type x, second_param_type y) : T1(x), _second(y) {}
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template <class A>
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explicit compressed_pair_2(const A& val)
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{
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init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), &_second);
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}
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compressed_pair_2(const ::boost::compressed_pair<T1,T2>& x)
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: T1(x.first()), _second(x.second()) {}
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#if 0
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compressed_pair_2& operator=(const compressed_pair_2& x) {
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cout << "assigning compressed pair 2" << endl;
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T1::operator=(x);
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_second = x._second;
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cout << "finished assigning compressed pair 2" << endl;
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return *this;
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}
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#endif
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first_reference first() { return *this; }
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first_const_reference first() const { return *this; }
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second_reference second() { return _second; }
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second_const_reference second() const { return _second; }
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void swap(compressed_pair_2& y)
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{
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// no need to swap empty base class:
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using std::swap;
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swap(_second, y._second);
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}
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};
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// T1 != T2, both empty
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template <class T1, class T2>
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class compressed_pair_3 : T1, T2
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{
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_3() : T1(), T2() {}
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compressed_pair_3(first_param_type x, second_param_type y) : T1(x), T2(y) {}
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template <class A>
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explicit compressed_pair_3(const A& val)
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{
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init_one<best_conversion_traits<A, T1, T2>::value>::init(val, static_cast<T1*>(this), static_cast<T2*>(this));
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}
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compressed_pair_3(const ::boost::compressed_pair<T1,T2>& x)
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: T1(x.first()), T2(x.second()) {}
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first_reference first() { return *this; }
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first_const_reference first() const { return *this; }
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second_reference second() { return *this; }
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second_const_reference second() const { return *this; }
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void swap(compressed_pair_3& y)
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{
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// no need to swap empty base classes:
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}
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};
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// T1 == T2, and empty
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template <class T1, class T2>
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class compressed_pair_4 : T1
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{
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_4() : T1() {}
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compressed_pair_4(first_param_type x, second_param_type y) : T1(x), m_second(y) {}
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// only one single argument constructor since T1 == T2
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explicit compressed_pair_4(first_param_type x) : T1(x), m_second(x) {}
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compressed_pair_4(const ::boost::compressed_pair<T1,T2>& x)
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: T1(x.first()), m_second(x.second()) {}
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first_reference first() { return *this; }
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first_const_reference first() const { return *this; }
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second_reference second() { return m_second; }
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second_const_reference second() const { return m_second; }
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void swap(compressed_pair_4& y)
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{
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// no need to swap empty base classes:
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}
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private:
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T2 m_second;
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};
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// T1 == T2, not empty
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template <class T1, class T2>
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class compressed_pair_5
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{
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private:
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T1 _first;
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T2 _second;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair_5() : _first(), _second() {}
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compressed_pair_5(first_param_type x, second_param_type y) : _first(x), _second(y) {}
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// only one single argument constructor since T1 == T2
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explicit compressed_pair_5(first_param_type x) : _first(x), _second(x) {}
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compressed_pair_5(const ::boost::compressed_pair<T1,T2>& c)
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: _first(c.first()), _second(c.second()) {}
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first_reference first() { return _first; }
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first_const_reference first() const { return _first; }
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second_reference second() { return _second; }
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second_const_reference second() const { return _second; }
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void swap(compressed_pair_5& y)
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{
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using std::swap;
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swap(_first, y._first);
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swap(_second, y._second);
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}
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};
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template <bool e1, bool e2, bool same>
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struct compressed_pair_chooser
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_0<T1, T2> type;
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};
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};
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template <>
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struct compressed_pair_chooser<false, true, false>
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_1<T1, T2> type;
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};
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};
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template <>
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struct compressed_pair_chooser<true, false, false>
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_2<T1, T2> type;
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};
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};
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template <>
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struct compressed_pair_chooser<true, true, false>
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_3<T1, T2> type;
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};
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};
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template <>
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struct compressed_pair_chooser<true, true, true>
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_4<T1, T2> type;
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};
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};
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template <>
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struct compressed_pair_chooser<false, false, true>
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{
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template <class T1, class T2>
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struct rebind
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{
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typedef compressed_pair_5<T1, T2> type;
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};
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};
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template <class T1, class T2>
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struct compressed_pair_traits
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{
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private:
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typedef compressed_pair_chooser<is_empty<T1>::value, is_empty<T2>::value, is_same<T1,T2>::value> chooser;
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typedef typename chooser::template rebind<T1, T2> bound_type;
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public:
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typedef typename bound_type::type type;
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};
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} // namespace detail
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template <class T1, class T2>
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class compressed_pair : public detail::compressed_pair_traits<T1, T2>::type
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{
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private:
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typedef typename detail::compressed_pair_traits<T1, T2>::type base_type;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair() : base_type() {}
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compressed_pair(first_param_type x, second_param_type y) : base_type(x, y) {}
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template <class A>
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explicit compressed_pair(const A& x) : base_type(x){}
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first_reference first() { return base_type::first(); }
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first_const_reference first() const { return base_type::first(); }
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second_reference second() { return base_type::second(); }
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second_const_reference second() const { return base_type::second(); }
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};
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template <class T1, class T2>
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inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
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{
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x.swap(y);
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}
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#else
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// no partial specialisation, no member templates:
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template <class T1, class T2>
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class compressed_pair
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{
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private:
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T1 _first;
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T2 _second;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::param_type first_param_type;
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typedef typename call_traits<second_type>::param_type second_param_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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typedef typename call_traits<first_type>::const_reference first_const_reference;
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typedef typename call_traits<second_type>::const_reference second_const_reference;
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compressed_pair() : _first(), _second() {}
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compressed_pair(first_param_type x, second_param_type y) : _first(x), _second(y) {}
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explicit compressed_pair(first_param_type x) : _first(x), _second() {}
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// can't define this in case T1 == T2:
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// explicit compressed_pair(second_param_type y) : _first(), _second(y) {}
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first_reference first() { return _first; }
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first_const_reference first() const { return _first; }
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second_reference second() { return _second; }
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second_const_reference second() const { return _second; }
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void swap(compressed_pair& y)
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{
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using std::swap;
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swap(_first, y._first);
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swap(_second, y._second);
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}
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};
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template <class T1, class T2>
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inline void swap(compressed_pair<T1, T2>& x, compressed_pair<T1, T2>& y)
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{
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x.swap(y);
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}
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#endif
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} // boost
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#endif // BOOST_OB_COMPRESSED_PAIR_HPP
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