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array.hpp
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array.hpp
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/***************************************************************************************************
* Copyright (c) 2023 - 2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************************/
#pragma once
#include <cute/config.hpp>
#include <cute/numeric/integral_constant.hpp>
#include <cute/util/type_traits.hpp>
namespace cute
{
template <class T, size_t N>
struct array
{
using value_type = T;
using size_type = size_t;
using difference_type = ptrdiff_t;
using reference = value_type&;
using const_reference = const value_type&;
using pointer = value_type*;
using const_pointer = const value_type*;
using iterator = pointer;
using const_iterator = const_pointer;
CUTE_HOST_DEVICE constexpr
reference operator[](size_type pos)
{
return begin()[pos];
}
CUTE_HOST_DEVICE constexpr
const_reference operator[](size_type pos) const
{
return begin()[pos];
}
CUTE_HOST_DEVICE constexpr
reference front()
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
const_reference front() const
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
reference back()
{
// return *rbegin();
return operator[](N-1);
}
CUTE_HOST_DEVICE constexpr
const_reference back() const
{
// return *rbegin();
return operator[](N-1);
}
CUTE_HOST_DEVICE constexpr
T* data()
{
return __elems_;
}
CUTE_HOST_DEVICE constexpr
T const* data() const
{
return __elems_;
}
CUTE_HOST_DEVICE constexpr
iterator begin()
{
return data();
}
CUTE_HOST_DEVICE constexpr
const_iterator begin() const
{
return data();
}
CUTE_HOST_DEVICE constexpr
const_iterator cbegin()
{
return begin();
}
CUTE_HOST_DEVICE constexpr
const_iterator cbegin() const
{
return begin();
}
CUTE_HOST_DEVICE constexpr
iterator end()
{
return data() + size();
}
CUTE_HOST_DEVICE constexpr
const_iterator end() const
{
return data() + size();
}
CUTE_HOST_DEVICE constexpr
const_iterator cend()
{
return end();
}
CUTE_HOST_DEVICE constexpr
const_iterator cend() const
{
return end();
}
CUTE_HOST_DEVICE constexpr
bool empty() const
{
return size() == 0;
}
CUTE_HOST_DEVICE constexpr
size_type size() const
{
return N;
}
CUTE_HOST_DEVICE constexpr
size_type max_size() const
{
return size();
}
CUTE_HOST_DEVICE constexpr
void fill(const T& value)
{
for (auto& e : *this) {
e = value;
}
}
CUTE_HOST_DEVICE constexpr
void clear()
{
fill(T(0));
}
CUTE_HOST_DEVICE constexpr
void swap(array& other)
{
using CUTE_STL_NAMESPACE::swap;
for (size_type i = 0; i < size(); ++i) {
swap((*this)[i], other[i]);
}
}
value_type __elems_[N > 0 ? N : 1];
};
template <class T>
struct array<T, 0>
{
using value_type = T;
using size_type = size_t;
using difference_type = ptrdiff_t;
using reference = value_type&;
using const_reference = const value_type&;
using pointer = value_type*;
using const_pointer = const value_type*;
using const_iterator = const_pointer;
using iterator = const_iterator;
CUTE_HOST_DEVICE constexpr
reference operator[](size_type pos)
{
return begin()[pos];
}
CUTE_HOST_DEVICE constexpr
const_reference operator[](size_type pos) const
{
return begin()[pos];
}
CUTE_HOST_DEVICE constexpr
reference front()
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
const_reference front() const
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
reference back()
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
const_reference back() const
{
return *begin();
}
CUTE_HOST_DEVICE constexpr
T* data()
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
T const* data() const
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
iterator begin()
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator begin() const
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator cbegin()
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator cbegin() const
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
iterator end()
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator end() const
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator cend()
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
const_iterator cend() const
{
return nullptr;
}
CUTE_HOST_DEVICE constexpr
bool empty() const
{
return true;
}
CUTE_HOST_DEVICE constexpr
size_type size() const
{
return 0;
}
CUTE_HOST_DEVICE constexpr
size_type max_size() const
{
return 0;
}
CUTE_HOST_DEVICE constexpr
void fill(const T& value)
{}
CUTE_HOST_DEVICE constexpr
void clear()
{}
CUTE_HOST_DEVICE constexpr
void swap(array& other)
{}
};
template <class T, size_t N>
CUTE_HOST_DEVICE constexpr
bool operator==(array<T,N> const& lhs, array<T,N> const& rhs)
{
for (size_t i = 0; i < N; ++i) {
if (lhs[i] != rhs[i]) {
return false;
}
}
return true;
}
template <class T, size_t N>
CUTE_HOST_DEVICE constexpr
void clear(array<T,N>& a)
{
a.fill(T(0));
}
template <typename T, size_t N>
CUTE_HOST_DEVICE constexpr
void fill(array<T,N>& a, T const& value)
{
a.fill(value);
}
template <class T, size_t N>
CUTE_HOST_DEVICE constexpr
void swap(array<T,N>& a, array<T,N>& b)
{
a.swap(b);
}
/// @return A cute::array of the elements of @c t in reverse order.
template <typename T, size_t N>
CUTE_HOST_DEVICE constexpr cute::array<T, N>
reverse(cute::array<T, N> const& t) {
if constexpr (N == 0u) {
return t;
}
else {
cute::array<T, N> t_r{};
for (size_t k = 0; k < N; ++k) {
t_r[k] = t[N - k - 1];
}
return t_r;
}
}
} // end cute
//
// Specialize tuple-related functionality for cute::array
//
#if defined(__CUDACC_RTC__)
#include <cuda/std/tuple>
#else
#include <tuple>
#endif
namespace cute
{
template <size_t I, class T, size_t N>
CUTE_HOST_DEVICE constexpr
T& get(array<T,N>& a)
{
static_assert(I < N, "Index out of range");
return a[I];
}
template <size_t I, class T, size_t N>
CUTE_HOST_DEVICE constexpr
T const& get(array<T,N> const& a)
{
static_assert(I < N, "Index out of range");
return a[I];
}
template <size_t I, class T, size_t N>
CUTE_HOST_DEVICE constexpr
T&& get(array<T,N>&& a)
{
static_assert(I < N, "Index out of range");
return std::move(a[I]);
}
} // end namespace cute
namespace CUTE_STL_NAMESPACE
{
template <class T, size_t N>
struct tuple_size<cute::array<T,N>>
: CUTE_STL_NAMESPACE::integral_constant<size_t, N>
{};
template <size_t I, class T, size_t N>
struct tuple_element<I, cute::array<T,N>>
{
using type = T;
};
template <class T, size_t N>
struct tuple_size<const cute::array<T,N>>
: CUTE_STL_NAMESPACE::integral_constant<size_t, N>
{};
template <size_t I, class T, size_t N>
struct tuple_element<I, const cute::array<T,N>>
{
using type = T;
};
} // end namespace CUTE_STL_NAMESPACE
#ifdef CUTE_STL_NAMESPACE_IS_CUDA_STD
namespace std
{
#if defined(__CUDACC_RTC__)
template <class... _Tp>
struct tuple_size;
template<size_t _Ip, class... _Tp>
struct tuple_element;
#endif
template <class T, size_t N>
struct tuple_size<cute::array<T,N>>
: CUTE_STL_NAMESPACE::integral_constant<size_t, N>
{};
template <size_t I, class T, size_t N>
struct tuple_element<I, cute::array<T,N>>
{
using type = T;
};
template <class T, size_t N>
struct tuple_size<const cute::array<T,N>>
: CUTE_STL_NAMESPACE::integral_constant<size_t, N>
{};
template <size_t I, class T, size_t N>
struct tuple_element<I, const cute::array<T,N>>
{
using type = T;
};
} // end namespace std
#endif // CUTE_STL_NAMESPACE_IS_CUDA_STD