524 lines
19 KiB
C++
524 lines
19 KiB
C++
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// Copyright 2005-2011 Daniel James.
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// Copyright 2009 Pablo Halpern.
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Allocator traits written by Daniel James based on Pablo Halpern's
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// implementation.
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#ifndef BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
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#define BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/detail/select_type.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/enum.hpp>
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#include <boost/limits.hpp>
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#include <boost/type_traits/add_lvalue_reference.hpp>
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#include <boost/pointer_to_other.hpp>
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#include <boost/assert.hpp>
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#include <boost/utility/addressof.hpp>
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#if !defined(BOOST_UNORDERED_USE_ALLOCATOR_TRAITS)
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#define BOOST_UNORDERED_USE_ALLOCATOR_TRAITS 0
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#endif
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#if BOOST_UNORDERED_USE_ALLOCATOR_TRAITS
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# include <memory>
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#endif
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#if !defined(BOOST_NO_0X_HDR_TYPE_TRAITS)
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# include <type_traits>
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#endif
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namespace boost { namespace unordered { namespace detail {
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////////////////////////////////////////////////////////////////////////////
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// Integral_constrant, true_type, false_type
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//
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// Uses the standard versions if available.
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#if !defined(BOOST_NO_0X_HDR_TYPE_TRAITS)
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using std::integral_constant;
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using std::true_type;
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using std::false_type;
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#else
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template <typename T, T Value>
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struct integral_constant { enum { value = Value }; };
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typedef boost::unordered::detail::integral_constant<bool, true> true_type;
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typedef boost::unordered::detail::integral_constant<bool, false> false_type;
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#endif
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////////////////////////////////////////////////////////////////////////////
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// Explicitly call a destructor
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#if defined(BOOST_MSVC)
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#pragma warning(push)
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#pragma warning(disable:4100) // unreferenced formal parameter
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#endif
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template <class T>
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inline void destroy(T* x) {
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x->~T();
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}
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#if defined(BOOST_MSVC)
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#pragma warning(pop)
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#endif
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////////////////////////////////////////////////////////////////////////////
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// Bits and pieces for implementing traits
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//
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// Some of these are also used elsewhere
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template <typename T> typename boost::add_lvalue_reference<T>::type make();
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struct choice9 { typedef char (&type)[9]; };
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struct choice8 : choice9 { typedef char (&type)[8]; };
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struct choice7 : choice8 { typedef char (&type)[7]; };
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struct choice6 : choice7 { typedef char (&type)[6]; };
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struct choice5 : choice6 { typedef char (&type)[5]; };
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struct choice4 : choice5 { typedef char (&type)[4]; };
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struct choice3 : choice4 { typedef char (&type)[3]; };
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struct choice2 : choice3 { typedef char (&type)[2]; };
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struct choice1 : choice2 { typedef char (&type)[1]; };
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choice1 choose();
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typedef choice1::type yes_type;
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typedef choice2::type no_type;
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struct private_type
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{
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private_type const &operator,(int) const;
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};
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template <typename T>
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no_type is_private_type(T const&);
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yes_type is_private_type(private_type const&);
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struct convert_from_anything {
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template <typename T>
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convert_from_anything(T const&);
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};
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#if !defined(BOOST_NO_SFINAE_EXPR)
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# define BOOST_UNORDERED_HAVE_CALL_DETECTION 1
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template <typename T, unsigned int> struct expr_test;
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template <typename T> struct expr_test<T, sizeof(char)> : T {};
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template <typename U> static char for_expr_test(U const&);
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#define BOOST_UNORDERED_CHECK_EXPRESSION(count, result, expression) \
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template <typename U> \
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static typename boost::unordered::detail::expr_test< \
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BOOST_PP_CAT(choice, result), \
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sizeof(boost::unordered::detail::for_expr_test(( \
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(expression), \
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0)))>::type test( \
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BOOST_PP_CAT(choice, count))
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#define BOOST_UNORDERED_DEFAULT_EXPRESSION(count, result) \
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template <typename U> \
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static BOOST_PP_CAT(choice, result)::type test( \
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BOOST_PP_CAT(choice, count))
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#define BOOST_UNORDERED_HAS_FUNCTION(name, thing, args, _) \
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struct BOOST_PP_CAT(has_, name) \
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{ \
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BOOST_UNORDERED_CHECK_EXPRESSION(1, 1, \
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boost::unordered::detail::make< thing >().name args); \
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BOOST_UNORDERED_DEFAULT_EXPRESSION(2, 2); \
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\
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enum { value = sizeof(test<T>(choose())) == sizeof(choice1::type) };\
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}
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#else
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# define BOOST_UNORDERED_HAVE_CALL_DETECTION 0
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template <typename T> struct identity { typedef T type; };
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#define BOOST_UNORDERED_CHECK_MEMBER(count, result, name, member) \
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\
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typedef typename boost::unordered::detail::identity<member>::type \
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BOOST_PP_CAT(check, count); \
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\
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template <BOOST_PP_CAT(check, count) e> \
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struct BOOST_PP_CAT(test, count) { \
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typedef BOOST_PP_CAT(choice, result) type; \
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}; \
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\
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template <class U> static typename \
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BOOST_PP_CAT(test, count)<&U::name>::type \
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test(BOOST_PP_CAT(choice, count))
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#define BOOST_UNORDERED_DEFAULT_MEMBER(count, result) \
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template <class U> static BOOST_PP_CAT(choice, result)::type \
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test(BOOST_PP_CAT(choice, count))
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#define BOOST_UNORDERED_HAS_MEMBER(name) \
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struct BOOST_PP_CAT(has_, name) \
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{ \
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struct impl { \
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struct base_mixin { int name; }; \
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struct base : public T, public base_mixin {}; \
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\
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BOOST_UNORDERED_CHECK_MEMBER(1, 1, name, int base_mixin::*); \
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BOOST_UNORDERED_DEFAULT_MEMBER(2, 2); \
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\
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enum { value = sizeof(choice2::type) == \
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sizeof(test<base>(choose())) \
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}; \
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}; \
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\
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enum { value = impl::value }; \
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}
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#endif
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////////////////////////////////////////////////////////////////////////////
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// Allocator traits
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//
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// Uses the standard versions if available.
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// (although untested as I don't have access to a standard version yet)
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#if BOOST_UNORDERED_USE_ALLOCATOR_TRAITS
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template <typename Alloc>
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struct allocator_traits : std::allocator_traits<Alloc> {};
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template <typename Alloc, typename T>
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struct rebind_wrap
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{
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typedef typename std::allocator_traits<Alloc>::
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template rebind_alloc<T> type;
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};
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#else
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// TODO: Does this match std::allocator_traits<Alloc>::rebind_alloc<T>?
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template <typename Alloc, typename T>
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struct rebind_wrap
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{
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typedef typename Alloc::BOOST_NESTED_TEMPLATE rebind<T>::other
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type;
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};
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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1400
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#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname) \
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template <typename Tp, typename Default> \
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struct default_type_ ## tname { \
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\
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template <typename X> \
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static choice1::type test(choice1, typename X::tname* = 0); \
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\
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template <typename X> \
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static choice2::type test(choice2, void* = 0); \
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\
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struct DefaultWrap { typedef Default tname; }; \
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\
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enum { value = (1 == sizeof(test<Tp>(choose()))) }; \
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\
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typedef typename boost::detail::if_true<value>:: \
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BOOST_NESTED_TEMPLATE then<Tp, DefaultWrap> \
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::type::tname type; \
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}
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#else
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template <typename T, typename T2>
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struct sfinae : T2 {};
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#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname) \
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template <typename Tp, typename Default> \
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struct default_type_ ## tname { \
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\
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template <typename X> \
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static typename boost::unordered::detail::sfinae< \
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typename X::tname, choice1>::type \
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test(choice1); \
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\
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template <typename X> \
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static choice2::type test(choice2); \
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\
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struct DefaultWrap { typedef Default tname; }; \
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\
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enum { value = (1 == sizeof(test<Tp>(choose()))) }; \
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\
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typedef typename boost::detail::if_true<value>:: \
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BOOST_NESTED_TEMPLATE then<Tp, DefaultWrap> \
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::type::tname type; \
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}
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#endif
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#define BOOST_UNORDERED_DEFAULT_TYPE(T,tname, arg) \
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typename default_type_ ## tname<T, arg>::type
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(pointer);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(const_pointer);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(void_pointer);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(const_void_pointer);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(difference_type);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(size_type);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_copy_assignment);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_move_assignment);
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BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_swap);
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#if BOOST_UNORDERED_HAVE_CALL_DETECTION
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template <typename T>
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BOOST_UNORDERED_HAS_FUNCTION(
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select_on_container_copy_construction, U const, (), 0
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);
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template <typename T>
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BOOST_UNORDERED_HAS_FUNCTION(
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max_size, U const, (), 0
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);
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template <typename T, typename ValueType>
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BOOST_UNORDERED_HAS_FUNCTION(
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construct, U, (
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boost::unordered::detail::make<ValueType*>(),
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boost::unordered::detail::make<ValueType const>()), 2
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);
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template <typename T, typename ValueType>
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BOOST_UNORDERED_HAS_FUNCTION(
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destroy, U, (boost::unordered::detail::make<ValueType*>()), 1
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);
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#else
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template <typename T>
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BOOST_UNORDERED_HAS_MEMBER(select_on_container_copy_construction);
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template <typename T>
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BOOST_UNORDERED_HAS_MEMBER(max_size);
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template <typename T, typename ValueType>
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BOOST_UNORDERED_HAS_MEMBER(construct);
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template <typename T, typename ValueType>
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BOOST_UNORDERED_HAS_MEMBER(destroy);
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#endif
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template <typename Alloc>
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inline typename boost::enable_if_c<
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boost::unordered::detail::
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has_select_on_container_copy_construction<Alloc>::value, Alloc
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>::type call_select_on_container_copy_construction(const Alloc& rhs)
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{
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return rhs.select_on_container_copy_construction();
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}
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template <typename Alloc>
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inline typename boost::disable_if_c<
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boost::unordered::detail::
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has_select_on_container_copy_construction<Alloc>::value, Alloc
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>::type call_select_on_container_copy_construction(const Alloc& rhs)
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{
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return rhs;
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}
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template <typename SizeType, typename Alloc>
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inline typename boost::enable_if_c<
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boost::unordered::detail::has_max_size<Alloc>::value, SizeType
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>::type call_max_size(const Alloc& a)
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{
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return a.max_size();
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}
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template <typename SizeType, typename Alloc>
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inline typename boost::disable_if_c<
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boost::unordered::detail::has_max_size<Alloc>::value, SizeType
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>::type call_max_size(const Alloc&)
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{
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return (std::numeric_limits<SizeType>::max)();
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}
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template <typename Alloc>
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struct allocator_traits
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{
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typedef Alloc allocator_type;
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typedef typename Alloc::value_type value_type;
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typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, pointer, value_type*)
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pointer;
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template <typename T>
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struct pointer_to_other : boost::pointer_to_other<pointer, T> {};
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typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, const_pointer,
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typename pointer_to_other<const value_type>::type)
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const_pointer;
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//typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, void_pointer,
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// typename pointer_to_other<void>::type)
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// void_pointer;
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//
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//typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, const_void_pointer,
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// typename pointer_to_other<const void>::type)
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// const_void_pointer;
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typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, difference_type,
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std::ptrdiff_t) difference_type;
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typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, size_type, std::size_t)
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size_type;
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// TODO: rebind_alloc and rebind_traits
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static pointer allocate(Alloc& a, size_type n)
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{ return a.allocate(n); }
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// I never use this, so I'll just comment it out for now.
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//
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//static pointer allocate(Alloc& a, size_type n,
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// const_void_pointer hint)
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// { return DEFAULT_FUNC(allocate, pointer)(a, n, hint); }
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static void deallocate(Alloc& a, pointer p, size_type n)
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{ a.deallocate(p, n); }
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public:
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// Only supporting the basic copy constructor for now.
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template <typename T>
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static typename boost::enable_if_c<
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boost::unordered::detail::has_construct<Alloc, T>::value>::type
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construct(Alloc& a, T* p, T const& x)
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{
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a.construct(p, x);
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}
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template <typename T>
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static typename boost::disable_if_c<
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boost::unordered::detail::has_construct<Alloc, T>::value>::type
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construct(Alloc&, T* p, T const& x)
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{
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new ((void*) p) T(x);
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}
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template <typename T>
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static typename boost::enable_if_c<
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boost::unordered::detail::has_destroy<Alloc, T>::value>::type
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destroy(Alloc& a, T* p)
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{
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a.destroy(p);
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}
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template <typename T>
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static typename boost::disable_if_c<
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boost::unordered::detail::has_destroy<Alloc, T>::value>::type
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destroy(Alloc&, T* p)
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{
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boost::unordered::detail::destroy(p);
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}
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static size_type max_size(const Alloc& a)
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{
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return boost::unordered::detail::call_max_size<size_type>(a);
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}
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// Allocator propagation on construction
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static Alloc select_on_container_copy_construction(Alloc const& rhs)
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{
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return boost::unordered::detail::
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call_select_on_container_copy_construction(rhs);
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}
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// Allocator propagation on assignment and swap.
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// Return true if lhs is modified.
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typedef BOOST_UNORDERED_DEFAULT_TYPE(
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Alloc, propagate_on_container_copy_assignment, false_type)
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propagate_on_container_copy_assignment;
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typedef BOOST_UNORDERED_DEFAULT_TYPE(
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Alloc,propagate_on_container_move_assignment, false_type)
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propagate_on_container_move_assignment;
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typedef BOOST_UNORDERED_DEFAULT_TYPE(
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Alloc,propagate_on_container_swap,false_type)
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propagate_on_container_swap;
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};
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#undef BOOST_UNORDERED_DEFAULT_TYPE_TMPLT
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#undef BOOST_UNORDERED_DEFAULT_TYPE
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#endif
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// array_constructor
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//
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// Allocate and construct an array in an exception safe manner, and
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// clean up if an exception is thrown before the container takes charge
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// of it.
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template <typename Allocator>
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struct array_constructor
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{
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typedef boost::unordered::detail::allocator_traits<Allocator> traits;
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typedef typename traits::pointer pointer;
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Allocator& alloc_;
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pointer ptr_;
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pointer constructed_;
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std::size_t length_;
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array_constructor(Allocator& a)
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: alloc_(a), ptr_(), constructed_(), length_(0)
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{
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constructed_ = pointer();
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ptr_ = pointer();
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}
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~array_constructor() {
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if (ptr_) {
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for(pointer p = ptr_; p != constructed_; ++p)
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traits::destroy(alloc_, boost::addressof(*p));
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traits::deallocate(alloc_, ptr_, length_);
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}
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}
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template <typename V>
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void construct(V const& v, std::size_t l)
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{
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BOOST_ASSERT(!ptr_);
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length_ = l;
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ptr_ = traits::allocate(alloc_, length_);
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pointer end = ptr_ + static_cast<std::ptrdiff_t>(length_);
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for(constructed_ = ptr_; constructed_ != end; ++constructed_)
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traits::construct(alloc_, boost::addressof(*constructed_), v);
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}
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pointer get() const
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{
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return ptr_;
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}
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pointer release()
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{
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pointer p(ptr_);
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ptr_ = pointer();
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return p;
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}
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private:
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array_constructor(array_constructor const&);
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array_constructor& operator=(array_constructor const&);
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};
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}}}
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#endif
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