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// Copyright (C) 2005-2011 Daniel James
// 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)
#ifndef BOOST_UNORDERED_DETAIL_EXTRACT_KEY_HPP_INCLUDED
#define BOOST_UNORDERED_DETAIL_EXTRACT_KEY_HPP_INCLUDED
#include <boost/config.hpp>
#if defined(BOOST_HAS_PRAGMA_ONCE)
#pragma once
#endif
#include <boost/unordered/detail/table.hpp>
namespace boost {
namespace unordered {
namespace detail {
// key extractors
//
// no throw
//
// 'extract_key' is called with the emplace parameters to return a
// key if available or 'no_key' is one isn't and will need to be
// constructed. This could be done by overloading the emplace implementation
// for the different cases, but that's a bit tricky on compilers without
// variadic templates.
struct no_key {
no_key() {}
template <class T> no_key(T const&) {}
};
template <typename Key, typename T>
struct is_key {
template <typename T2>
static choice1::type test(T2 const&);
static choice2::type test(Key const&);
enum { value = sizeof(test(boost::unordered::detail::make<T>())) ==
sizeof(choice2::type) };
typedef typename boost::detail::if_true<value>::
BOOST_NESTED_TEMPLATE then<Key const&, no_key>::type type;
};
template <class ValueType>
struct set_extractor
{
typedef ValueType value_type;
typedef ValueType key_type;
static key_type const& extract(value_type const& v)
{
return v;
}
static no_key extract()
{
return no_key();
}
template <class Arg>
static no_key extract(Arg const&)
{
return no_key();
}
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template <class Arg1, class Arg2, class... Args>
static no_key extract(Arg1 const&, Arg2 const&, Args const&...)
{
return no_key();
}
#else
template <class Arg1, class Arg2>
static no_key extract(Arg1 const&, Arg2 const&)
{
return no_key();
}
#endif
};
template <class Key, class ValueType>
struct map_extractor
{
typedef ValueType value_type;
typedef typename boost::remove_const<Key>::type key_type;
static key_type const& extract(value_type const& v)
{
return v.first;
}
template <class Second>
static key_type const& extract(std::pair<key_type, Second> const& v)
{
return v.first;
}
template <class Second>
static key_type const& extract(
std::pair<key_type const, Second> const& v)
{
return v.first;
}
template <class Arg1>
static key_type const& extract(key_type const& k, Arg1 const&)
{
return k;
}
static no_key extract()
{
return no_key();
}
template <class Arg>
static no_key extract(Arg const&)
{
return no_key();
}
template <class Arg1, class Arg2>
static no_key extract(Arg1 const&, Arg2 const&)
{
return no_key();
}
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
template <class Arg1, class Arg2, class Arg3, class... Args>
static no_key extract(Arg1 const&, Arg2 const&, Arg3 const&,
Args const&...)
{
return no_key();
}
#endif
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
#define BOOST_UNORDERED_KEY_FROM_TUPLE(namespace_) \
template <typename T2> \
static no_key extract(boost::unordered::piecewise_construct_t, \
namespace_ tuple<> const&, T2 const&) \
{ \
return no_key(); \
} \
\
template <typename T, typename T2> \
static typename is_key<key_type, T>::type \
extract(boost::unordered::piecewise_construct_t, \
namespace_ tuple<T> const& k, T2 const&) \
{ \
return typename is_key<key_type, T>::type( \
namespace_ get<0>(k)); \
}
#else
#define BOOST_UNORDERED_KEY_FROM_TUPLE(namespace_) \
static no_key extract(boost::unordered::piecewise_construct_t, \
namespace_ tuple<> const&) \
{ \
return no_key(); \
} \
\
template <typename T> \
static typename is_key<key_type, T>::type \
extract(boost::unordered::piecewise_construct_t, \
namespace_ tuple<T> const& k) \
{ \
return typename is_key<key_type, T>::type( \
namespace_ get<0>(k)); \
}
#endif
BOOST_UNORDERED_KEY_FROM_TUPLE(boost::)
#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
BOOST_UNORDERED_KEY_FROM_TUPLE(std::)
#endif
};
}}}
#endif
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