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/*
* Copyright 2008-2018 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.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/execute_with_allocator_fwd.h>
#include <thrust/pair.h>
#include <thrust/detail/raw_pointer_cast.h>
#include <thrust/detail/type_traits/pointer_traits.h>
#include <thrust/detail/allocator/allocator_traits.h>
#include <thrust/detail/integer_math.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
template <
typename T
, typename Allocator
, template <typename> class BaseSystem
>
__host__
thrust::pair<T*, std::ptrdiff_t>
get_temporary_buffer(
thrust::detail::execute_with_allocator<Allocator, BaseSystem>& system
, std::ptrdiff_t n
)
{
typedef typename thrust::detail::remove_reference<Allocator>::type naked_allocator;
typedef typename thrust::detail::allocator_traits<naked_allocator> alloc_traits;
typedef typename alloc_traits::void_pointer void_pointer;
typedef typename alloc_traits::size_type size_type;
typedef typename alloc_traits::value_type value_type;
// How many elements of type value_type do we need to accommodate n elements
// of type T?
size_type num_elements = divide_ri(sizeof(T) * n, sizeof(value_type));
void_pointer ptr = alloc_traits::allocate(system.get_allocator(), num_elements);
// Return the pointer and the number of elements of type T allocated.
return thrust::make_pair(thrust::reinterpret_pointer_cast<T*>(ptr),n);
}
template <
typename Pointer
, typename Allocator
, template <typename> class BaseSystem
>
__host__
void
return_temporary_buffer(
thrust::detail::execute_with_allocator<Allocator, BaseSystem>& system
, Pointer p
, std::ptrdiff_t n
)
{
typedef typename thrust::detail::remove_reference<Allocator>::type naked_allocator;
typedef typename thrust::detail::allocator_traits<naked_allocator> alloc_traits;
typedef typename alloc_traits::pointer pointer;
typedef typename alloc_traits::size_type size_type;
typedef typename alloc_traits::value_type value_type;
typedef typename thrust::detail::pointer_traits<Pointer>::element_type T;
size_type num_elements = divide_ri(sizeof(T) * n, sizeof(value_type));
pointer to_ptr = thrust::reinterpret_pointer_cast<pointer>(p);
alloc_traits::deallocate(system.get_allocator(), to_ptr, num_elements);
}
#if THRUST_CPP_DIALECT >= 2011
template <
typename T,
template <typename> class BaseSystem,
typename Allocator,
typename ...Dependencies
>
__host__
thrust::pair<T*, std::ptrdiff_t>
get_temporary_buffer(
thrust::detail::execute_with_allocator_and_dependencies<Allocator, BaseSystem, Dependencies...>& system,
std::ptrdiff_t n
)
{
typedef typename thrust::detail::remove_reference<Allocator>::type naked_allocator;
typedef typename thrust::detail::allocator_traits<naked_allocator> alloc_traits;
typedef typename alloc_traits::void_pointer void_pointer;
typedef typename alloc_traits::size_type size_type;
typedef typename alloc_traits::value_type value_type;
// How many elements of type value_type do we need to accommodate n elements
// of type T?
size_type num_elements = divide_ri(sizeof(T) * n, sizeof(value_type));
void_pointer ptr = alloc_traits::allocate(system.get_allocator(), num_elements);
// Return the pointer and the number of elements of type T allocated.
return thrust::make_pair(thrust::reinterpret_pointer_cast<T*>(ptr),n);
}
template <
typename Pointer,
template <typename> class BaseSystem,
typename Allocator,
typename ...Dependencies
>
__host__
void
return_temporary_buffer(
thrust::detail::execute_with_allocator_and_dependencies<Allocator, BaseSystem, Dependencies...>& system,
Pointer p,
std::ptrdiff_t n
)
{
typedef typename thrust::detail::remove_reference<Allocator>::type naked_allocator;
typedef typename thrust::detail::allocator_traits<naked_allocator> alloc_traits;
typedef typename alloc_traits::pointer pointer;
typedef typename alloc_traits::size_type size_type;
typedef typename alloc_traits::value_type value_type;
typedef typename thrust::detail::pointer_traits<Pointer>::element_type T;
size_type num_elements = divide_ri(sizeof(T) * n, sizeof(value_type));
pointer to_ptr = thrust::reinterpret_pointer_cast<pointer>(p);
alloc_traits::deallocate(system.get_allocator(), to_ptr, num_elements);
}
#endif
} // namespace detail
THRUST_NAMESPACE_END
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