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/*
* Copyright 2008-2021 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file
* \brief C++14's
* <a href="https://en.cppreference.com/w/cpp/utility/integer_sequence"><tt>std::index_sequence</tt></a>,
* associated helper aliases, and some related extensions.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/cpp11_required.h>
#include <type_traits>
#include <utility>
#include <cstdint>
#include <utility>
THRUST_NAMESPACE_BEGIN
/*! \addtogroup utility
* \{
*/
/*! \addtogroup type_traits Type Traits
* \{
*/
/*! \brief A compile-time sequence of
* <a href="https://en.cppreference.com/w/cpp/language/constant_expression#Integral_constant_expression"><i>integral constants</i></a>
* of type \c T with values <tt>Is...</tt>.
*
* \see <a href="https://en.cppreference.com/w/cpp/language/constant_expression#Integral_constant_expression"><i>integral constants</i></a>
* \see index_sequence
* \see make_integer_sequence
* \see make_reversed_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
* \see integer_sequence_push_front
* \see integer_sequence_push_back
* \see <a href="https://en.cppreference.com/w/cpp/utility/integer_sequence"><tt>std::integer_sequence</tt></a>
*/
#if THRUST_CPP_DIALECT >= 2014
template <typename T, T... Is>
using integer_sequence = std::integer_sequence<T, Is...>;
#else
template <typename T, T... Is>
struct integer_sequence
{
using type = integer_sequence;
using value_type = T;
using size_type = std::size_t;
THRUST_HOST_DEVICE
static constexpr size_type size() noexcept
{
return sizeof...(Is);
}
};
#endif
///////////////////////////////////////////////////////////////////////////////
/*! \brief A compile-time sequence of type
* <a href="https://en.cppreference.com/w/cpp/types/size_t">std::size_t</a>
* with values <tt>Is...</tt>.
*
* \see integer_sequence
* \see make_integer_sequence
* \see make_reversed_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
* \see integer_sequence_push_front
* \see integer_sequence_push_back
* \see <a href="https://en.cppreference.com/w/cpp/utility/integer_sequence"><tt>std::index_sequence</tt></a>
*/
#if THRUST_CPP_DIALECT >= 2014
template <std::size_t... Is>
using index_sequence = std::index_sequence<Is...>;
#else
template <std::size_t... Is>
using index_sequence = integer_sequence<std::size_t, Is...>;
#endif
#if THRUST_CPP_DIALECT < 2014
/*! \cond
*/
namespace detail
{
/*! \brief Create a new \c integer_sequence containing the elements of \c
* Sequence0 followed by the elements of \c Sequence1. \c Sequence0::size() is
* added to each element from \c Sequence1 in the new sequence.
*
* \see integer_sequence
* \see index_sequence
* \see make_reversed_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
* \see merge_and_renumber_reversed_integer_sequences_impl
*/
template <typename Sequence0, typename Sequence1>
struct merge_and_renumber_integer_sequences_impl;
template <typename Sequence0, typename Sequence1>
using merge_and_renumber_integer_sequences =
typename merge_and_renumber_integer_sequences_impl<
Sequence0, Sequence1
>::type;
template <typename T, std::size_t N>
struct make_integer_sequence_impl;
} // namespace detail
/*! \endcond
*/
#endif
/*! \brief Create a new \c integer_sequence with elements
* <tt>0, 1, 2, ..., N - 1</tt> of type \c T.
*
* \see integer_sequence
* \see index_sequence
* \see make_reversed_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
* \see <a href="https://en.cppreference.com/w/cpp/utility/integer_sequence"><tt>std::make_integer_sequence</tt></a>
*/
#if THRUST_CPP_DIALECT >= 2014
template <typename T, std::size_t N>
using make_integer_sequence = std::make_integer_sequence<T, N>;
#else
template <typename T, std::size_t N>
using make_integer_sequence =
typename detail::make_integer_sequence_impl<T, N>::type;
/*! \cond
*/
namespace detail
{
template <typename T, T... Is0, T... Is1>
struct merge_and_renumber_integer_sequences_impl<
integer_sequence<T, Is0...>, integer_sequence<T, Is1...>
>
{
using type = integer_sequence<T, Is0..., (sizeof...(Is0) + Is1)...>;
};
template <typename T, std::size_t N>
struct make_integer_sequence_impl
{
using type = merge_and_renumber_integer_sequences<
make_integer_sequence<T, N / 2>
, make_integer_sequence<T, N - N / 2>
>;
};
template <typename T>
struct make_integer_sequence_impl<T, 0>
{
using type = integer_sequence<T>;
};
template <typename T>
struct make_integer_sequence_impl<T, 1>
{
using type = integer_sequence<T, 0>;
};
} // namespace detail
/*! \endcond
*/
#endif
///////////////////////////////////////////////////////////////////////////////
/*! \brief Create a new \c integer_sequence with elements
* <tt>0, 1, 2, ..., N - 1</tt> of type
* <a href="https://en.cppreference.com/w/cpp/types/size_t">std::size_t</a>.
*
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_reversed_integer_sequence
* \see make_reversed_index_sequence
* \see <a href="https://en.cppreference.com/w/cpp/utility/integer_sequence"><tt>std::make_index_sequence</tt></a>
*/
#if THRUST_CPP_DIALECT >= 2014
template <std::size_t N>
using make_index_sequence = std::make_index_sequence<N>;
#else
template <std::size_t N>
using make_index_sequence =
make_integer_sequence<std::size_t, N>;
#endif
///////////////////////////////////////////////////////////////////////////////
/*! \cond
*/
namespace detail
{
/*! \brief Create a new \c integer_sequence containing the elements of \c
* Sequence0 followed by the elements of \c Sequence1. \c Sequence1::size() is
* added to each element from \c Sequence0 in the new sequence.
*
* \see make_reversed_integer_sequence
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_reversed_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
* \see merge_and_renumber_integer_sequences_impl
*/
template <typename Sequence0, typename Sequence1>
struct merge_and_renumber_reversed_integer_sequences_impl;
template <typename Sequence0, typename Sequence1>
using merge_and_renumber_reversed_integer_sequences =
typename merge_and_renumber_reversed_integer_sequences_impl<
Sequence0, Sequence1
>::type;
template <typename T, std::size_t N>
struct make_reversed_integer_sequence_impl;
template <typename T, T Value, typename Sequence>
struct integer_sequence_push_front_impl;
template <typename T, T Value, typename Sequence>
struct integer_sequence_push_back_impl;
template <typename T, T... Is0, T... Is1>
struct merge_and_renumber_reversed_integer_sequences_impl<
integer_sequence<T, Is0...>, integer_sequence<T, Is1...>
>
{
using type = integer_sequence<T, (sizeof...(Is1) + Is0)..., Is1...>;
};
} // namespace detail
/*! \endcond
*/
///////////////////////////////////////////////////////////////////////////////
/*! \brief Create a new \c integer_sequence with elements
* <tt>N - 1, N - 2, N - 3, ..., 0</tt>.
*
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_index_sequence
* \see make_reversed_index_sequence
*/
template <typename T, std::size_t N>
using make_reversed_integer_sequence =
typename detail::make_reversed_integer_sequence_impl<T, N>::type;
/*! \brief Create a new \c index_sequence with elements
* <tt>N - 1, N - 2, N - 3, ..., 0</tt>.
*
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_reversed_integer_sequence
* \see make_reversed_index_sequence
*/
template <std::size_t N>
using make_reversed_index_sequence =
make_reversed_integer_sequence<std::size_t, N>;
/*! \brief Add a new element to the front of an \c integer_sequence.
*
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_index_sequence
*/
template <typename T, T Value, typename Sequence>
using integer_sequence_push_front =
typename detail::integer_sequence_push_front_impl<T, Value, Sequence>::type;
/*! \brief Add a new element to the back of an \c integer_sequence.
*
* \see integer_sequence
* \see index_sequence
* \see make_integer_sequence
* \see make_index_sequence
*/
template <typename T, T Value, typename Sequence>
using integer_sequence_push_back =
typename detail::integer_sequence_push_back_impl<T, Value, Sequence>::type;
///////////////////////////////////////////////////////////////////////////////
/*! \cond
*/
namespace detail
{
template <typename T, std::size_t N>
struct make_reversed_integer_sequence_impl
{
using type = merge_and_renumber_reversed_integer_sequences<
make_reversed_integer_sequence<T, N / 2>
, make_reversed_integer_sequence<T, N - N / 2>
>;
};
///////////////////////////////////////////////////////////////////////////////
template <typename T>
struct make_reversed_integer_sequence_impl<T, 0>
{
using type = integer_sequence<T>;
};
template <typename T>
struct make_reversed_integer_sequence_impl<T, 1>
{
using type = integer_sequence<T, 0>;
};
///////////////////////////////////////////////////////////////////////////////
template <typename T, T I0, T... Is>
struct integer_sequence_push_front_impl<T, I0, integer_sequence<T, Is...> >
{
using type = integer_sequence<T, I0, Is...>;
};
///////////////////////////////////////////////////////////////////////////////
template <typename T, T I0, T... Is>
struct integer_sequence_push_back_impl<T, I0, integer_sequence<T, Is...> >
{
using type = integer_sequence<T, Is..., I0>;
};
///////////////////////////////////////////////////////////////////////////////
} // namespace detail
/*! \endcond
*/
/*! \} // type traits
*/
/*! \} // utility
*/
THRUST_NAMESPACE_END
|
