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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2004-2007 Jonathan Turkanis
// Distributed under 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/iostreams for documentation.
// Contains the definition of the class template
// boost::iostreams::detail::double_object, which is similar to compressed pair
// except that both members of the pair have the same type, and
// compression occurs only if requested using a boolean template
// parameter.
#ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
#define BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <algorithm> // swap.
#include <boost/detail/workaround.hpp>
#include <boost/mpl/if.hpp>
#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
# include <msl_utility>
#else
# include <boost/call_traits.hpp>
#endif
namespace boost { namespace iostreams { namespace detail {
template<typename T>
class single_object_holder {
public:
#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
typedef Metrowerks::call_traits<T> traits_type;
#else
typedef boost::call_traits<T> traits_type;
#endif
typedef typename traits_type::param_type param_type;
typedef typename traits_type::reference reference;
typedef typename traits_type::const_reference const_reference;
single_object_holder() { }
single_object_holder(param_type t) : first_(t) { }
reference first() { return first_; }
const_reference first() const { return first_; }
reference second() { return first_; }
const_reference second() const { return first_; }
void swap(single_object_holder& o)
{ std::swap(first_, o.first_); }
private:
T first_;
};
template<typename T>
struct double_object_holder {
public:
#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
typedef Metrowerks::call_traits<T> traits_type;
#else
typedef boost::call_traits<T> traits_type;
#endif
typedef typename traits_type::param_type param_type;
typedef typename traits_type::reference reference;
typedef typename traits_type::const_reference const_reference;
double_object_holder() { }
double_object_holder(param_type t1, param_type t2)
: first_(t1), second_(t2) { }
reference first() { return first_; }
const_reference first() const { return first_; }
reference second() { return second_; }
const_reference second() const { return second_; }
void swap(double_object_holder& d)
{
std::swap(first_, d.first_);
std::swap(second_, d.second_);
}
private:
T first_, second_;
};
template<typename T, typename IsDouble>
class double_object
: public mpl::if_<
IsDouble,
double_object_holder<T>,
single_object_holder<T>
>::type
{
private:
typedef typename
mpl::if_<
IsDouble,
double_object_holder<T>,
single_object_holder<T>
>::type base_type;
public:
#if BOOST_WORKAROUND(__MWERKS__, > 0x3003)
typedef Metrowerks::call_traits<T> traits_type;
#else
typedef boost::call_traits<T> traits_type;
#endif
typedef typename traits_type::param_type param_type;
typedef typename traits_type::reference reference;
typedef typename traits_type::const_reference const_reference;
double_object() : base_type() {}
double_object(param_type t1, param_type t2)
: base_type(t1, t2) { }
bool is_double() const { return IsDouble::value; }
};
} } } // End namespaces detail, iostreams, boost.
#endif // #ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
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