115 lines
3.9 KiB
C++
Executable File
115 lines
3.9 KiB
C++
Executable File
// (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)
|
|
# 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
|