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47070610d0d44a99ebd266e4d856e902a9c32a4a
boost_fusion/include/boost/fusion/container/vector/vector.hpp
Kohei Takahashi 47070610d0 Remove unnecessary user defined ctor 
there is no reasons defining those probably.

This change allows to be vector trivially copyable iff all elements are
trivially copyable, i.e. following static assert now passes.

```cpp
static_assert(std::is_trivially_copyable<vector<double, int>>{});
```
2018-03-14 15:15:33 +09:00

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/*=============================================================================
Copyright (c) 2014-2015 Kohei Takahashi
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 FUSION_VECTOR_11052014_1625
#define FUSION_VECTOR_11052014_1625
#include <boost/config.hpp>
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/container/vector/detail/config.hpp>
#include <boost/fusion/container/vector/vector_fwd.hpp>
///////////////////////////////////////////////////////////////////////////////
// Without variadics, we will use the PP version
///////////////////////////////////////////////////////////////////////////////
#if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
# include <boost/fusion/container/vector/detail/cpp03/vector.hpp>
#else
///////////////////////////////////////////////////////////////////////////////
// C++11 interface
///////////////////////////////////////////////////////////////////////////////
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/support/is_sequence.hpp>
#include <boost/fusion/support/detail/and.hpp>
#include <boost/fusion/support/detail/index_sequence.hpp>
#include <boost/fusion/container/vector/detail/at_impl.hpp>
#include <boost/fusion/container/vector/detail/value_at_impl.hpp>
#include <boost/fusion/container/vector/detail/begin_impl.hpp>
#include <boost/fusion/container/vector/detail/end_impl.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/iterator/advance.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <boost/core/enable_if.hpp>
#include <boost/mpl/int.hpp>
#include <boost/type_traits/integral_constant.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <cstddef>
#include <utility>
namespace boost { namespace fusion
{
struct vector_tag;
struct random_access_traversal_tag;
namespace vector_detail
{
struct each_elem {};
template <
typename This, typename T, typename T_, std::size_t Size, bool IsSeq
>
struct can_convert_impl : false_type {};
template <typename This, typename T, typename Sequence, std::size_t Size>
struct can_convert_impl<This, T, Sequence, Size, true> : true_type {};
template <typename This, typename Sequence, typename T>
struct can_convert_impl<This, Sequence, T, 1, true>
: integral_constant<
bool
, !is_convertible<
Sequence
, typename fusion::extension::value_at_impl<vector_tag>::
template apply< This, mpl::int_<0> >::type
>::value
>
{};
template <typename This, typename T, typename T_, std::size_t Size>
struct can_convert
: can_convert_impl<
This, T, T_, Size, traits::is_sequence<T_>::value
>
{};
template <typename T, bool IsSeq, std::size_t Size>
struct is_longer_sequence_impl : false_type {};
template <typename Sequence, std::size_t Size>
struct is_longer_sequence_impl<Sequence, true, Size>
: integral_constant<
bool, (fusion::result_of::size<Sequence>::value >= Size)
>
{};
template<typename T, std::size_t Size>
struct is_longer_sequence
: is_longer_sequence_impl<T, traits::is_sequence<T>::value, Size>
{};
// forward_at_c allows to access Nth element even if ForwardSequence
// since fusion::at_c requires RandomAccessSequence.
namespace result_of
{
template <typename Sequence, int N>
struct forward_at_c
: fusion::result_of::deref<
typename fusion::result_of::advance_c<
typename fusion::result_of::begin<
typename remove_reference<Sequence>::type
>::type
, N
>::type
>
{};
}
template <int N, typename Sequence>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline typename result_of::forward_at_c<Sequence, N>::type
forward_at_c(Sequence&& seq)
{
typedef typename
result_of::forward_at_c<Sequence, N>::type
result;
return std::forward<result>(*advance_c<N>(begin(seq)));
}
// Object proxy since preserve object order
template <std::size_t, typename T>
struct store
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
store()
: elem() // value-initialized explicitly
{}
template <
typename U
, typename = typename boost::disable_if<
is_base_of<store, typename remove_reference<U>::type>
>::type
>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
store(U&& rhs)
: elem(std::forward<U>(rhs))
{}
T elem;
};
template <typename I, typename ...T>
struct vector_data;
template <std::size_t ...I, typename ...T>
struct vector_data<detail::index_sequence<I...>, T...>
: store<I, T>...
, sequence_base<vector_data<detail::index_sequence<I...>, T...> >
{
typedef vector_tag fusion_tag;
typedef fusion_sequence_tag tag; // this gets picked up by MPL
typedef mpl::false_ is_view;
typedef random_access_traversal_tag category;
typedef mpl::int_<sizeof...(T)> size;
typedef vector<T...> type_sequence;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
BOOST_DEFAULTED_FUNCTION(vector_data(), {})
template <
typename Sequence
, typename Sequence_ = typename remove_reference<Sequence>::type
, typename = typename boost::enable_if<
can_convert<vector_data, Sequence, Sequence_, sizeof...(I)>
>::type
>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit
vector_data(each_elem, Sequence&& rhs)
: store<I, T>(forward_at_c<I>(std::forward<Sequence>(rhs)))...
{}
template <typename ...U>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
explicit
vector_data(each_elem, U&&... var)
: store<I, T>(std::forward<U>(var))...
{}
template <typename Sequence>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
void
assign_sequence(Sequence&& seq)
{
assign(std::forward<Sequence>(seq), detail::index_sequence<I...>());
}
template <typename Sequence>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
void
assign(Sequence&&, detail::index_sequence<>) {}
template <typename Sequence, std::size_t N, std::size_t ...M>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
void
assign(Sequence&& seq, detail::index_sequence<N, M...>)
{
at_impl(mpl::int_<N>()) = vector_detail::forward_at_c<N>(seq);
assign(std::forward<Sequence>(seq), detail::index_sequence<M...>());
}
template <std::size_t N, typename U>
static BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
U& at_detail(store<N, U>* this_)
{
return this_->elem;
}
template <std::size_t N, typename U>
static BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
U const& at_detail(store<N, U> const* this_)
{
return this_->elem;
}
template <typename J>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_impl(J) -> decltype(at_detail<J::value>(&std::declval<vector_data&>()))
{
return at_detail<J::value>(this);
}
template <typename J>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_impl(J) const -> decltype(at_detail<J::value>(&std::declval<vector_data const&>()))
{
return at_detail<J::value>(this);
}
};
} // namespace boost::fusion::vector_detail
template <typename... T>
struct vector
: vector_detail::vector_data<
typename detail::make_index_sequence<sizeof...(T)>::type
, T...
>
{
typedef vector_detail::vector_data<
typename detail::make_index_sequence<sizeof...(T)>::type
, T...
> base;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
BOOST_DEFAULTED_FUNCTION(vector(), {})
template <
typename... U
, typename = typename boost::enable_if_c<(
sizeof...(U) >= 1 &&
fusion::detail::and_<is_convertible<U, T>...>::value &&
!fusion::detail::and_<
is_base_of<vector, typename remove_reference<U>::type>...
>::value
)>::type
>
// XXX: constexpr become error due to pull-request #79, booooo!!
// In the (near) future release, should be fixed.
/* BOOST_CONSTEXPR */ BOOST_FUSION_GPU_ENABLED
explicit vector(U&&... u)
: base(vector_detail::each_elem(), std::forward<U>(u)...)
{}
template <
typename Sequence
, typename = typename boost::enable_if_c<
vector_detail::is_longer_sequence<
typename remove_reference<Sequence>::type, sizeof...(T)
>::value
>::type
>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
vector(Sequence&& seq)
: base(vector_detail::each_elem(), std::forward<Sequence>(seq))
{}
template <typename Sequence>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
vector&
operator=(Sequence&& rhs)
{
base::assign_sequence(std::forward<Sequence>(rhs));
return *this;
}
};
}}
#endif
#endif
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