// (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 |