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// Copyright (C) 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)
// See http://www.boost.org/libs/unordered for documentation
#ifndef BOOST_UNORDERED_EMPLACE_ARGS_HPP
#define BOOST_UNORDERED_EMPLACE_ARGS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/move/move.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/inc.hpp>
#include <boost/preprocessor/dec.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/type_traits/is_class.hpp>
#include <boost/tuple/tuple.hpp>
#include <utility>
#if !defined(BOOST_NO_0X_HDR_TUPLE)
#include <tuple>
#endif
#if defined(BOOST_MSVC)
#pragma warning(push)
#pragma warning(disable:4512) // assignment operator could not be generated.
#pragma warning(disable:4345) // behavior change: an object of POD type
// constructed with an initializer of the form ()
// will be default-initialized.
#endif
#define BOOST_UNORDERED_EMPLACE_LIMIT 10
#if !defined(BOOST_NO_RVALUE_REFERENCES) && \
!defined(BOOST_NO_VARIADIC_TEMPLATES)
#define BOOST_UNORDERED_VARIADIC_MOVE
#endif
namespace boost { namespace unordered { namespace detail {
////////////////////////////////////////////////////////////////////////////
// emplace_args
//
// Either forwarding variadic arguments, or storing the arguments in
// emplace_args##n
#if defined(BOOST_UNORDERED_VARIADIC_MOVE)
#define BOOST_UNORDERED_EMPLACE_TEMPLATE typename... Args
#define BOOST_UNORDERED_EMPLACE_ARGS Args&&... args
#define BOOST_UNORDERED_EMPLACE_FORWARD boost::forward<Args>(args)...
#else
#define BOOST_UNORDERED_EMPLACE_TEMPLATE typename Args
#define BOOST_UNORDERED_EMPLACE_ARGS Args const& args
#define BOOST_UNORDERED_EMPLACE_FORWARD args
#define BOOST_UNORDERED_FWD_PARAM(z, n, a) \
BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(a, n)
#define BOOST_UNORDERED_CALL_FORWARD(z, i, a) \
boost::forward<BOOST_PP_CAT(A,i)>(BOOST_PP_CAT(a,i))
#define BOOST_UNORDERED_EARGS(z, n, _) \
template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
struct BOOST_PP_CAT(emplace_args, n) \
{ \
BOOST_PP_REPEAT_##z(n, BOOST_UNORDERED_EARGS_MEMBER, _) \
BOOST_PP_CAT(emplace_args, n) ( \
BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, Arg, a) \
) : BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_EARGS_INIT, _) \
{} \
\
}; \
\
template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
inline BOOST_PP_CAT(emplace_args, n) < \
BOOST_PP_ENUM_PARAMS_Z(z, n, A) \
> create_emplace_args( \
BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_FWD_PARAM, a) \
) \
{ \
BOOST_PP_CAT(emplace_args, n) < \
BOOST_PP_ENUM_PARAMS_Z(z, n, A) \
> e(BOOST_PP_ENUM_PARAMS_Z(z, n, a)); \
return e; \
}
#if defined(BOOST_NO_RVALUE_REFERENCES)
#define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \
typedef BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(Arg, n); \
BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n);
#define BOOST_UNORDERED_EARGS_INIT(z, n, _) \
BOOST_PP_CAT(a, n)( \
boost::forward<BOOST_PP_CAT(A,n)>(BOOST_PP_CAT(a, n)))
#else
#define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \
typedef typename boost::add_lvalue_reference<BOOST_PP_CAT(A, n)>::type \
BOOST_PP_CAT(Arg, n); \
BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n);
#define BOOST_UNORDERED_EARGS_INIT(z, n, _) \
BOOST_PP_CAT(a, n)(BOOST_PP_CAT(a, n))
#endif
BOOST_PP_REPEAT_FROM_TO(1, BOOST_UNORDERED_EMPLACE_LIMIT, BOOST_UNORDERED_EARGS,
_)
#undef BOOST_UNORDERED_DEFINE_EMPLACE_ARGS
#undef BOOST_UNORDERED_EARGS_MEMBER
#undef BOOST_UNORDERED_EARGS_INIT
#endif
////////////////////////////////////////////////////////////////////////////
// rvalue parameters when type can't be a BOOST_RV_REF(T) parameter
// e.g. for int
#if !defined(BOOST_NO_RVALUE_REFERENCES)
# define BOOST_UNORDERED_RV_REF(T) BOOST_RV_REF(T)
#else
struct please_ignore_this_overload {
typedef please_ignore_this_overload type;
};
template <typename T>
struct rv_ref_impl {
typedef BOOST_RV_REF(T) type;
};
template <typename T>
struct rv_ref :
boost::detail::if_true<
boost::is_class<T>::value
>::BOOST_NESTED_TEMPLATE then <
boost::unordered::detail::rv_ref_impl<T>,
please_ignore_this_overload
>::type
{};
# define BOOST_UNORDERED_RV_REF(T) \
typename boost::unordered::detail::rv_ref<T>::type
#endif
////////////////////////////////////////////////////////////////////////////
// Construct from tuple
//
// Used for piecewise construction.
#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590)
#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(n, namespace_) \
template<typename T> \
void construct_from_tuple(T* ptr, namespace_::tuple<>) \
{ \
new ((void*) ptr) T(); \
} \
\
BOOST_PP_REPEAT_FROM_TO(1, n, \
BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL, namespace_)
#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL(z, n, namespace_) \
template<typename T, BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
void construct_from_tuple(T* ptr, \
namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \
{ \
new ((void*) ptr) T( \
BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_) \
); \
}
#define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, namespace_) \
namespace_::get<n>(x)
BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(10, boost)
#if !defined(BOOST_NO_0X_HDR_TUPLE)
BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(10, std)
#endif
#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE
#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL
#undef BOOST_UNORDERED_GET_TUPLE_ARG
#else
template <int N> struct length {};
template<typename T>
void construct_from_tuple_impl(
boost::unordered::detail::length<0>, T* ptr,
boost::tuple<>)
{
new ((void*) ptr) T();
}
#define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL(z, n, _) \
template<typename T, BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \
void construct_from_tuple_impl( \
boost::unordered::detail::length<n>, T* ptr, \
namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \
{ \
new ((void*) ptr) T( \
BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_) \
); \
}
#define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, _) \
boost::get<n>(x)
BOOST_PP_REPEAT_FROM_TO(1, 10, \
BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL, _)
template <typename T, typename Tuple>
void construct_from_tuple(T* ptr, Tuple const& x)
{
construct_from_tuple_impl(
boost::unordered::detail::length<
boost::tuples::length<Tuple>::value>(),
ptr, x);
}
#undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE_IMPL
#undef BOOST_UNORDERED_GET_TUPLE_ARG
#endif
////////////////////////////////////////////////////////////////////////////
// SFINAE traits for construction.
// Decide which construction method to use for a three argument
// call. Note that this is difficult to do using overloads because
// the arguments are packed into 'emplace_args3'.
//
// The decision is made on the first argument.
#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
template <typename A, typename B, typename A0>
struct emulation1 {
static choice1::type test(choice1, std::pair<A, B> const&);
static choice2::type test(choice2, A const&);
static choice3::type test(choice3, convert_from_anything const&);
enum { value =
sizeof(test(choose(), boost::unordered::detail::make<A0>())) ==
sizeof(choice2::type) };
};
#endif
template <typename A, typename B, typename A0>
struct check3_base {
static choice1::type test(choice1,
boost::unordered::piecewise_construct_t);
#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
static choice2::type test(choice2, A const&);
#endif
static choice3::type test(choice3, ...);
enum { value =
sizeof(test(choose(), boost::unordered::detail::make<A0>())) };
};
template <typename A, typename B, typename A0>
struct piecewise3 {
enum { value = check3_base<A,B,A0>::value == sizeof(choice1::type) };
};
#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
template <typename A, typename B, typename A0>
struct emulation3 {
enum { value = check3_base<A,B,A0>::value == sizeof(choice2::type) };
};
#endif
#if defined(BOOST_UNORDERED_VARIADIC_MOVE)
////////////////////////////////////////////////////////////////////////////
// Construct from variadic parameters
template <typename T, typename... Args>
inline void construct_impl(T* address, Args&&... args)
{
new((void*) address) T(boost::forward<Args>(args)...);
}
template <typename A, typename B, typename A0, typename A1, typename A2>
inline typename enable_if<piecewise3<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address, A0&&, A1&& a1, A2&& a2)
{
boost::unordered::detail::construct_from_tuple(
boost::addressof(address->first), a1);
boost::unordered::detail::construct_from_tuple(
boost::addressof(address->second), a2);
}
#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
template <typename A, typename B, typename A0>
inline typename enable_if<emulation1<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address, A0&& a0)
{
new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
new((void*) boost::addressof(address->second)) B();
}
template <typename A, typename B, typename A0, typename A1, typename A2>
inline typename enable_if<emulation3<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address, A0&& a0, A1&& a1, A2&& a2)
{
new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
new((void*) boost::addressof(address->second)) B(
boost::forward<A1>(a1),
boost::forward<A2>(a2));
}
template <typename A, typename B,
typename A0, typename A1, typename A2, typename A3,
typename... Args>
inline void construct_impl(std::pair<A, B>* address,
A0&& a0, A1&& a1, A2&& a2, A3&& a3, Args&&... args)
{
new((void*) boost::addressof(address->first)) A(boost::forward<A0>(a0));
new((void*) boost::addressof(address->second)) B(
boost::forward<A1>(a1),
boost::forward<A2>(a2),
boost::forward<A3>(a3),
boost::forward<Args>(args)...);
}
#endif // BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT
#else // BOOST_UNORDERED_VARIADIC_MOVE
////////////////////////////////////////////////////////////////////////////////
// Construct from emplace_args
#define BOOST_UNORDERED_CONSTRUCT_IMPL(z, num_params, _) \
template < \
typename T, \
BOOST_PP_ENUM_PARAMS_Z(z, num_params, typename A) \
> \
inline void construct_impl(T* address, \
boost::unordered::detail::BOOST_PP_CAT(emplace_args,num_params) < \
BOOST_PP_ENUM_PARAMS_Z(z, num_params, A) \
> const& args) \
{ \
new((void*) address) T( \
BOOST_PP_ENUM_##z(num_params, BOOST_UNORDERED_CALL_FORWARD, \
args.a)); \
}
template <typename T, typename A0>
inline void construct_impl(T* address, emplace_args1<A0> const& args)
{
new((void*) address) T(boost::forward<A0>(args.a0));
}
template <typename T, typename A0, typename A1>
inline void construct_impl(T* address, emplace_args2<A0, A1> const& args)
{
new((void*) address) T(
boost::forward<A0>(args.a0),
boost::forward<A1>(args.a1)
);
}
template <typename T, typename A0, typename A1, typename A2>
inline void construct_impl(T* address, emplace_args3<A0, A1, A2> const& args)
{
new((void*) address) T(
boost::forward<A0>(args.a0),
boost::forward<A1>(args.a1),
boost::forward<A2>(args.a2)
);
}
BOOST_PP_REPEAT_FROM_TO(4, BOOST_UNORDERED_EMPLACE_LIMIT,
BOOST_UNORDERED_CONSTRUCT_IMPL, _)
#undef BOOST_UNORDERED_CONSTRUCT_IMPL
template <typename A, typename B, typename A0, typename A1, typename A2>
inline typename enable_if<piecewise3<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address,
boost::unordered::detail::emplace_args3<A0, A1, A2> const& args)
{
boost::unordered::detail::construct_from_tuple(
boost::addressof(address->first), args.a1);
boost::unordered::detail::construct_from_tuple(
boost::addressof(address->second), args.a2);
}
#if defined(BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT)
template <typename A, typename B, typename A0>
inline typename enable_if<emulation1<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address,
boost::unordered::detail::emplace_args1<A0> const& args)
{
new((void*) boost::addressof(address->first)) A(
boost::forward<A0>(args.a0));
new((void*) boost::addressof(address->second)) B();
}
template <typename A, typename B, typename A0, typename A1, typename A2>
inline typename enable_if<emulation3<A, B, A0>, void>::type
construct_impl(std::pair<A, B>* address,
boost::unordered::detail::emplace_args3<A0, A1, A2> const& args)
{
new((void*) boost::addressof(address->first)) A(
boost::forward<A0>(args.a0));
new((void*) boost::addressof(address->second)) B(
boost::forward<A1>(args.a1),
boost::forward<A2>(args.a2));
}
#define BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL(z, num_params, _) \
template <typename A, typename B, \
BOOST_PP_ENUM_PARAMS_Z(z, num_params, typename A) \
> \
inline void construct_impl(std::pair<A, B>* address, \
boost::unordered::detail::BOOST_PP_CAT(emplace_args, num_params) < \
BOOST_PP_ENUM_PARAMS_Z(z, num_params, A) \
> const& args) \
{ \
new((void*) boost::addressof(address->first)) A( \
boost::forward<A0>(args.a0)); \
new((void*) boost::addressof(address->second)) B( \
BOOST_PP_ENUM_##z(BOOST_PP_DEC(num_params), \
BOOST_UNORDERED_CALL_FORWARD2, args.a)); \
}
#define BOOST_UNORDERED_CALL_FORWARD2(z, i, a) \
BOOST_UNORDERED_CALL_FORWARD(z, BOOST_PP_INC(i), a)
BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL(1, 2, _)
BOOST_PP_REPEAT_FROM_TO(4, BOOST_UNORDERED_EMPLACE_LIMIT,
BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL, _)
#undef BOOST_UNORDERED_CONSTRUCT_PAIR_IMPL
#undef BOOST_UNORDERED_CALL_FORWARD2
#endif // BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT
#endif // BOOST_UNORDERED_VARIADIC_MOVE
////////////////////////////////////////////////////////////////////////////
// Construct without using the emplace args mechanism.
template <typename T, typename A0>
inline void construct_impl2(T* address, BOOST_FWD_REF(A0) a0)
{
new((void*) address) T(
boost::forward<A0>(a0)
);
}
}}}
#if defined(BOOST_MSVC)
#pragma warning(pop)
#endif
#endif
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