boost/container/detail/variadic_templates_tools.hpp . Boost , ,

boost/container/detail/variadic_templates_tools.hpp

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2008-2013. 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/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP
#define BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP
#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif
#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
#include <boost/move/utility_core.hpp>
#include <boost/container/detail/type_traits.hpp>
#include <cstddef>   //std::size_t
namespace boost {
namespace container {
namespace container_detail {
template<typename... Values>
class tuple;
template<> class tuple<>
{};
template<typename Head, typename... Tail>
class tuple<Head, Tail...>
   : private tuple<Tail...>
{
   typedef tuple<Tail...> inherited;
   public:
   tuple()
      : inherited(), m_head()
   {}
   template<class U, class ...Args>
   tuple(U &&u, Args && ...args)
      : inherited(::boost::forward<Args>(args)...), m_head(::boost::forward<U>(u))
   {}
   // Construct tuple from another tuple.
   template<typename... VValues>
   tuple(const tuple<VValues...>& other)
      : inherited(other.tail()), m_head(other.head())
   {}
   template<typename... VValues>
   tuple& operator=(const tuple<VValues...>& other)
   {
      m_head = other.head();
      tail() = other.tail();
      return this;
   }
   typename add_reference<Head>::type head()             {  return m_head; }
   typename add_reference<const Head>::type head() const {  return m_head; }
   inherited& tail()             { return *this; }
   const inherited& tail() const { return *this; }
   protected:
   Head m_head;
};
template<typename... Values>
tuple<Values&&...> forward_as_tuple(Values&&... values)
{ return tuple<Values&&...>(::boost::forward<Values>(values)...); }
template<int I, typename Tuple>
struct tuple_element;
template<int I, typename Head, typename... Tail>
struct tuple_element<I, tuple<Head, Tail...> >
{
   typedef typename tuple_element<I-1, tuple<Tail...> >::type type;
};
template<typename Head, typename... Tail>
struct tuple_element<0, tuple<Head, Tail...> >
{
   typedef Head type;
};
template<int I, typename Tuple>
class get_impl;
template<int I, typename Head, typename... Values>
class get_impl<I, tuple<Head, Values...> >
{
   typedef typename tuple_element<I-1, tuple<Values...> >::type   Element;
   typedef get_impl<I-1, tuple<Values...> >                       Next;
   public:
   typedef typename add_reference<Element>::type                  type;
   typedef typename add_const_reference<Element>::type            const_type;
   static type get(tuple<Head, Values...>& t)              { return Next::get(t.tail()); }
   static const_type get(const tuple<Head, Values...>& t)  { return Next::get(t.tail()); }
};
template<typename Head, typename... Values>
class get_impl<0, tuple<Head, Values...> >
{
   public:
   typedef typename add_reference<Head>::type         type;
   typedef typename add_const_reference<Head>::type   const_type;
   static type       get(tuple<Head, Values...>& t)      { return t.head(); }
   static const_type get(const tuple<Head, Values...>& t){ return t.head(); }
};
template<int I, typename... Values>
typename get_impl<I, tuple<Values...> >::type get(tuple<Values...>& t)
{  return get_impl<I, tuple<Values...> >::get(t);  }
template<int I, typename... Values>
typename get_impl<I, tuple<Values...> >::const_type get(const tuple<Values...>& t)
{  return get_impl<I, tuple<Values...> >::get(t);  }
////////////////////////////////////////////////////
// Builds an index_tuple<0, 1, 2, ..., Num-1>, that will
// be used to "unpack" into comma-separated values
// in a function call.
////////////////////////////////////////////////////
template<std::size_t ... Indexes>
struct index_tuple{};
template<std::size_t Num, typename Tuple = index_tuple<> >
struct build_number_seq;
template<std::size_t Num, std::size_t ... Indexes>
struct build_number_seq<Num, index_tuple<Indexes...> >
   : build_number_seq<Num - 1, index_tuple<Indexes..., sizeof...(Indexes)> >
{};
template<std::size_t ... Indexes>
struct build_number_seq<0, index_tuple<Indexes...> >
{  typedef index_tuple<Indexes...> type;  };
}}}   //namespace boost { namespace container { namespace container_detail {
#include <boost/container/detail/config_end.hpp>
#endif   //#ifndef BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP
boost/container/detail/variadic_templates_tools.hpp

Boost , ,

Boost C++ Libraries

boost/container/detail/variadic_templates_tools.hpp
