481 lines
18 KiB
C++
481 lines
18 KiB
C++
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// Copyright (C) 2011 Daniel James.
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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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// See http://www.boost.org/libs/unordered for documentation
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#ifndef BOOST_UNORDERED_EMPLACE_ARGS_HPP
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#define BOOST_UNORDERED_EMPLACE_ARGS_HPP
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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/move/move.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/inc.hpp>
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#include <boost/preprocessor/dec.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/type_traits/is_class.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <utility>
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#if !defined(BOOST_NO_0X_HDR_TUPLE)
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#include <tuple>
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#endif
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#if defined(BOOST_MSVC)
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#pragma warning(push)
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#pragma warning(disable:4512) // assignment operator could not be generated.
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#pragma warning(disable:4345) // behavior change: an object of POD type
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// constructed with an initializer of the form ()
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// will be default-initialized.
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#endif
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#define BOOST_UNORDERED_EMPLACE_LIMIT 10
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#if !defined(BOOST_NO_RVALUE_REFERENCES) && \
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!defined(BOOST_NO_VARIADIC_TEMPLATES)
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#define BOOST_UNORDERED_VARIADIC_MOVE
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#endif
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namespace boost { namespace unordered { namespace detail {
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////////////////////////////////////////////////////////////////////////////
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// emplace_args
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//
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// Either forwarding variadic arguments, or storing the arguments in
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// emplace_args##n
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#if defined(BOOST_UNORDERED_VARIADIC_MOVE)
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#define BOOST_UNORDERED_EMPLACE_TEMPLATE typename... Args
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#define BOOST_UNORDERED_EMPLACE_ARGS Args&&... args
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#define BOOST_UNORDERED_EMPLACE_FORWARD boost::forward<Args>(args)...
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#else
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#define BOOST_UNORDERED_EMPLACE_TEMPLATE typename Args
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#define BOOST_UNORDERED_EMPLACE_ARGS Args const& args
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#define BOOST_UNORDERED_EMPLACE_FORWARD args
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#define BOOST_UNORDERED_FWD_PARAM(z, n, a) \
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BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(a, n)
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#define BOOST_UNORDERED_CALL_FORWARD(z, i, a) \
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boost::forward<BOOST_PP_CAT(A,i)>(BOOST_PP_CAT(a,i))
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#define BOOST_UNORDERED_EARGS(z, n, _) \
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template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
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struct BOOST_PP_CAT(emplace_args, n) \
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{ \
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BOOST_PP_REPEAT_##z(n, BOOST_UNORDERED_EARGS_MEMBER, _) \
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BOOST_PP_CAT(emplace_args, n) ( \
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BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, Arg, a) \
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) : BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_EARGS_INIT, _) \
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{} \
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\
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}; \
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\
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template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
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inline BOOST_PP_CAT(emplace_args, n) < \
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BOOST_PP_ENUM_PARAMS_Z(z, n, A) \
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> create_emplace_args( \
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BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_FWD_PARAM, a) \
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) \
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{ \
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BOOST_PP_CAT(emplace_args, n) < \
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BOOST_PP_ENUM_PARAMS_Z(z, n, A) \
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> e(BOOST_PP_ENUM_PARAMS_Z(z, n, a)); \
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return e; \
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}
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#if defined(BOOST_NO_RVALUE_REFERENCES)
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#define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \
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typedef BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(Arg, n); \
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BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n);
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#define BOOST_UNORDERED_EARGS_INIT(z, n, _) \
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BOOST_PP_CAT(a, n)( \
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boost::forward<BOOST_PP_CAT(A,n)>(BOOST_PP_CAT(a, n)))
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#else
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#define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \
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typedef typename boost::add_lvalue_reference<BOOST_PP_CAT(A, n)>::type \
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BOOST_PP_CAT(Arg, n); \
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BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n);
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#define BOOST_UNORDERED_EARGS_INIT(z, n, _) \
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BOOST_PP_CAT(a, n)(BOOST_PP_CAT(a, n))
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#endif
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BOOST_PP_REPEAT_FROM_TO(1, BOOST_UNORDERED_EMPLACE_LIMIT, BOOST_UNORDERED_EARGS,
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_)
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#undef BOOST_UNORDERED_DEFINE_EMPLACE_ARGS
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#undef BOOST_UNORDERED_EARGS_MEMBER
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#undef BOOST_UNORDERED_EARGS_INIT
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#endif
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////////////////////////////////////////////////////////////////////////////
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// rvalue parameters when type can't be a BOOST_RV_REF(T) parameter
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// e.g. for int
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#if !defined(BOOST_NO_RVALUE_REFERENCES)
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# define BOOST_UNORDERED_RV_REF(T) BOOST_RV_REF(T)
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#else
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struct please_ignore_this_overload {
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typedef please_ignore_this_overload type;
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};
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template <typename T>
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struct rv_ref_impl {
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typedef BOOST_RV_REF(T) type;
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};
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template <typename T>
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struct rv_ref :
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boost::detail::if_true<
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boost::is_class<T>::value
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>::BOOST_NESTED_TEMPLATE then <
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boost::unordered::detail::rv_ref_impl<T>,
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please_ignore_this_overload
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>::type
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{};
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# define BOOST_UNORDERED_RV_REF(T) \
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typename boost::unordered::detail::rv_ref<T>::type
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#endif
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////////////////////////////////////////////////////////////////////////////
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// Construct from tuple
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//
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// Used for piecewise construction.
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#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590)
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#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(n, namespace_) \
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template<typename T> \
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void construct_from_tuple(T* ptr, namespace_::tuple<>) \
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{ \
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new ((void*) ptr) T(); \
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} \
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\
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BOOST_PP_REPEAT_FROM_TO(1, n, \
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BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL, namespace_)
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#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL(z, n, namespace_) \
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template<typename T, BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
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void construct_from_tuple(T* ptr, \
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namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \
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{ \
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new ((void*) ptr) T( \
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BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_) \
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); \
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}
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#define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, namespace_) \
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namespace_::get<n>(x)
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BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(10, boost)
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#if !defined(BOOST_NO_0X_HDR_TUPLE)
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BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(10, std)
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#endif
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#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE
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#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL
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#undef BOOST_UNORDERED_GET_TUPLE_ARG
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#else
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template <int N> struct length {};
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template<typename T>
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void construct_from_tuple_impl(
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boost::unordered::detail::length<0>, T* ptr,
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boost::tuple<>)
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{
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new ((void*) ptr) T();
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}
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#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL(z, n, _) \
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template<typename T, BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
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void construct_from_tuple_impl( \
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boost::unordered::detail::length<n>, T* ptr, \
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namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \
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{ \
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new ((void*) ptr) T( \
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BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_) \
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); \
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}
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#define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, _) \
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boost::get<n>(x)
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BOOST_PP_REPEAT_FROM_TO(1, 10, \
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BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL, _)
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template <typename T, typename Tuple>
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void construct_from_tuple(T* ptr, Tuple const& x)
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{
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construct_from_tuple_impl(
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boost::unordered::detail::length<
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boost::tuples::length<Tuple>::value>(),
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ptr, x);
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}
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#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL
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#undef BOOST_UNORDERED_GET_TUPLE_ARG
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#endif
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////////////////////////////////////////////////////////////////////////////
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// SFINAE traits for construction.
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// Decide which construction method to use for a three argument
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// call. Note that this is difficult to do using overloads because
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// the arguments are packed into 'emplace_args3'.
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//
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// The decision is made on the first argument.
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#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
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template <typename A, typename B, typename A0>
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struct emulation1 {
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static choice1::type test(choice1, std::pair<A, B> const&);
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static choice2::type test(choice2, A const&);
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static choice3::type test(choice3, convert_from_anything const&);
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enum { value =
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sizeof(test(choose(), boost::unordered::detail::make<A0>())) ==
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sizeof(choice2::type) };
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};
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#endif
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template <typename A, typename B, typename A0>
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struct check3_base {
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static choice1::type test(choice1,
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boost::unordered::piecewise_construct_t);
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#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
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static choice2::type test(choice2, A const&);
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#endif
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static choice3::type test(choice3, ...);
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enum { value =
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sizeof(test(choose(), boost::unordered::detail::make<A0>())) };
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};
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template <typename A, typename B, typename A0>
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struct piecewise3 {
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enum { value = check3_base<A,B,A0>::value == sizeof(choice1::type) };
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};
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#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
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template <typename A, typename B, typename A0>
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struct emulation3 {
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enum { value = check3_base<A,B,A0>::value == sizeof(choice2::type) };
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};
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#endif
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#if defined(BOOST_UNORDERED_VARIADIC_MOVE)
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////////////////////////////////////////////////////////////////////////////
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// Construct from variadic parameters
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template <typename T, typename... Args>
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inline void construct_impl(T* address, Args&&... args)
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{
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new((void*) address) T(boost::forward<Args>(args)...);
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}
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template <typename A, typename B, typename A0, typename A1, typename A2>
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inline typename enable_if<piecewise3<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address, A0&&, A1&& a1, A2&& a2)
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{
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boost::unordered::detail::construct_from_tuple(
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boost::addressof(address->first), a1);
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boost::unordered::detail::construct_from_tuple(
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boost::addressof(address->second), a2);
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}
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#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
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template <typename A, typename B, typename A0>
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inline typename enable_if<emulation1<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address, A0&& a0)
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{
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new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
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new((void*) boost::addressof(address->second)) B();
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}
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template <typename A, typename B, typename A0, typename A1, typename A2>
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inline typename enable_if<emulation3<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address, A0&& a0, A1&& a1, A2&& a2)
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{
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new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
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new((void*) boost::addressof(address->second)) B(
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boost::forward<A1>(a1),
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boost::forward<A2>(a2));
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}
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template <typename A, typename B,
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typename A0, typename A1, typename A2, typename A3,
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typename... Args>
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inline void construct_impl(std::pair<A, B>* address,
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A0&& a0, A1&& a1, A2&& a2, A3&& a3, Args&&... args)
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{
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new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
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new((void*) boost::addressof(address->second)) B(
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boost::forward<A1>(a1),
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boost::forward<A2>(a2),
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boost::forward<A3>(a3),
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boost::forward<Args>(args)...);
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}
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#endif // BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT
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#else // BOOST_UNORDERED_VARIADIC_MOVE
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////////////////////////////////////////////////////////////////////////////////
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// Construct from emplace_args
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#define BOOST_UNORDERED_CONSTRUCT_IMPL(z, num_params, _) \
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template < \
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typename T, \
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BOOST_PP_ENUM_PARAMS_Z(z, num_params, typename A) \
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> \
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inline void construct_impl(T* address, \
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boost::unordered::detail::BOOST_PP_CAT(emplace_args,num_params) < \
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BOOST_PP_ENUM_PARAMS_Z(z, num_params, A) \
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> const& args) \
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{ \
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new((void*) address) T( \
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BOOST_PP_ENUM_##z(num_params, BOOST_UNORDERED_CALL_FORWARD, \
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args.a)); \
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}
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template <typename T, typename A0>
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inline void construct_impl(T* address, emplace_args1<A0> const& args)
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{
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new((void*) address) T(boost::forward<A0>(args.a0));
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}
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template <typename T, typename A0, typename A1>
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inline void construct_impl(T* address, emplace_args2<A0, A1> const& args)
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{
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new((void*) address) T(
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boost::forward<A0>(args.a0),
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boost::forward<A1>(args.a1)
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);
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}
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template <typename T, typename A0, typename A1, typename A2>
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inline void construct_impl(T* address, emplace_args3<A0, A1, A2> const& args)
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{
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new((void*) address) T(
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boost::forward<A0>(args.a0),
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boost::forward<A1>(args.a1),
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boost::forward<A2>(args.a2)
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);
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}
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BOOST_PP_REPEAT_FROM_TO(4, BOOST_UNORDERED_EMPLACE_LIMIT,
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BOOST_UNORDERED_CONSTRUCT_IMPL, _)
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#undef BOOST_UNORDERED_CONSTRUCT_IMPL
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template <typename A, typename B, typename A0, typename A1, typename A2>
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inline typename enable_if<piecewise3<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address,
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boost::unordered::detail::emplace_args3<A0, A1, A2> const& args)
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{
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boost::unordered::detail::construct_from_tuple(
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boost::addressof(address->first), args.a1);
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boost::unordered::detail::construct_from_tuple(
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boost::addressof(address->second), args.a2);
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}
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#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
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template <typename A, typename B, typename A0>
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inline typename enable_if<emulation1<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address,
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boost::unordered::detail::emplace_args1<A0> const& args)
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{
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new((void*) boost::addressof(address->first)) A(
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boost::forward<A0>(args.a0));
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new((void*) boost::addressof(address->second)) B();
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}
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template <typename A, typename B, typename A0, typename A1, typename A2>
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inline typename enable_if<emulation3<A, B, A0>, void>::type
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construct_impl(std::pair<A, B>* address,
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boost::unordered::detail::emplace_args3<A0, A1, A2> const& args)
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{
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new((void*) boost::addressof(address->first)) A(
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boost::forward<A0>(args.a0));
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new((void*) boost::addressof(address->second)) B(
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boost::forward<A1>(args.a1),
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boost::forward<A2>(args.a2));
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}
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#define BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL(z, num_params, _) \
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template <typename A, typename B, \
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BOOST_PP_ENUM_PARAMS_Z(z, num_params, typename A) \
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> \
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inline void construct_impl(std::pair<A, B>* address, \
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boost::unordered::detail::BOOST_PP_CAT(emplace_args, num_params) < \
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BOOST_PP_ENUM_PARAMS_Z(z, num_params, A) \
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> const& args) \
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{ \
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new((void*) boost::addressof(address->first)) A( \
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boost::forward<A0>(args.a0)); \
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new((void*) boost::addressof(address->second)) B( \
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BOOST_PP_ENUM_##z(BOOST_PP_DEC(num_params), \
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BOOST_UNORDERED_CALL_FORWARD2, args.a)); \
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}
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#define BOOST_UNORDERED_CALL_FORWARD2(z, i, a) \
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BOOST_UNORDERED_CALL_FORWARD(z, BOOST_PP_INC(i), a)
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BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL(1, 2, _)
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BOOST_PP_REPEAT_FROM_TO(4, BOOST_UNORDERED_EMPLACE_LIMIT,
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BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL, _)
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#undef BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL
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#undef BOOST_UNORDERED_CALL_FORWARD2
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#endif // BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT
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#endif // BOOST_UNORDERED_VARIADIC_MOVE
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////////////////////////////////////////////////////////////////////////////
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// Construct without using the emplace args mechanism.
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|
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template <typename T, typename A0>
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inline void construct_impl2(T* address, BOOST_FWD_REF(A0) a0)
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{
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new((void*) address) T(
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boost::forward<A0>(a0)
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);
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}
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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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#endif
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