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/*
* Copyright 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/type_traits/pointer_traits.h>
#include <thrust/mr/memory_resource.h>
#include <thrust/mr/validator.h>
THRUST_NAMESPACE_BEGIN
namespace mr
{
/*! A \p memory_resource derived class that wraps a pointer type.
*
* Wrapping the pointer type allows this class to use either the global (static) memory
* resource (see \p mr::get_global_resource ), or a provided "upstream" memory resource
* instance. When allocations are performed, the returned pointer is cast to the \p Pointer
* template parameter type, for convenience.
*
* \tparam Upstream - a \p memory_resource derrived type. Will be wrapped by this class.
* \tparam Pointer - when allocations are performed, the return value will be cast to this type.
*/
template<typename Upstream, typename Pointer>
class fancy_pointer_resource final : public memory_resource<Pointer>, private validator<Upstream>
{
public:
/*! Constructs a pointer to the global (static) memory resource.
* See \p mr::get_global_resource.
*/
fancy_pointer_resource() : m_upstream(get_global_resource<Upstream>())
{
}
/*! Constructs a pointer to the provided memory resource.
* \param upstream - pointer to the memory_resource to wrap.
*/
fancy_pointer_resource(Upstream * upstream) : m_upstream(upstream)
{
}
/*! Performs a memory allocation. Returns a pointer of type \p Pointer.
* \param bytes - the requested size of the allocation, in bytes
* \param alignment - specifies the alignment for the allocation.
* Defaults to THRUST_MR_DEFAULT_ALIGNMENT.
*/
THRUST_NODISCARD
virtual Pointer do_allocate(std::size_t bytes, std::size_t alignment = THRUST_MR_DEFAULT_ALIGNMENT) override
{
return static_cast<Pointer>(m_upstream->do_allocate(bytes, alignment));
}
/*! Deallocates memory that was previously allocated with this allocator.
* \param p - pointer to the memory that was previously allocated by \p do_allocate
* \param bytes - the size of the allocation that was requested, in bytes
* \param alignment - specifies the alignment that was used for the allocation
*/
virtual void do_deallocate(Pointer p, std::size_t bytes, std::size_t alignment) override
{
return m_upstream->do_deallocate(
static_cast<typename Upstream::pointer>(
thrust::detail::pointer_traits<Pointer>::get(p)),
bytes, alignment);
}
private:
Upstream * m_upstream;
};
} // end mr
THRUST_NAMESPACE_END
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