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// Copyright (C) 2018 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//
#ifndef MEMORY_DESCRIPTOR_REF_HPP
#define MEMORY_DESCRIPTOR_REF_HPP
#include <iosfwd>
#include "memory/memory_types.hpp"
namespace ade
{
class MemoryDescriptor;
class MemoryDescriptorView;
/// Lghtweight reference into MemoryDescriptorView
/// It can reference to a part of MemoryDescriptorView
class MemoryDescriptorRef final
{
public:
/// Constructs empty MemoryDescriptorRef
MemoryDescriptorRef();
/// Consructs MemoryDescriptorRef covering entire view
///
/// @param view Source view
MemoryDescriptorRef(MemoryDescriptorView& view);
/// Consructs MemoryDescriptorRef covering part view
///
/// @param view Source view
/// @param span Span into descriptor view, must be inside view dimensions
MemoryDescriptorRef(MemoryDescriptorView& view, const memory::DynMdSpan& span);
~MemoryDescriptorRef();
MemoryDescriptorRef(const MemoryDescriptorRef&) = default;
MemoryDescriptorRef(MemoryDescriptorRef&&) = default;
MemoryDescriptorRef& operator=(const MemoryDescriptorRef&) = default;
MemoryDescriptorRef& operator=(MemoryDescriptorRef&&) = default;
/// Get source view
///
/// @returns Source view
MemoryDescriptorView* getView();
/// Get source view
///
/// @returns Source view
const MemoryDescriptorView* getView() const;
/// Get source descriptor
///
/// @returns Source descriptor
MemoryDescriptor* getDescriptor();
/// Get source descriptor
///
/// @returns Source descriptor
const MemoryDescriptor* getDescriptor() const;
/// Get span into current view
///
/// @returns span
const memory::DynMdSpan& span() const;
/// Get span size
///
/// @returns size
memory::DynMdSize size() const;
/// Get buffer element size
///
/// @returns Size in bytes
std::size_t elementSize() const;
/// Get span into parent ref
///
/// @returns span
memory::DynMdSpan originSpan() const;
/// Returns externally accessible memory view if any
///
/// @returns View into externally accessible memory or null view
memory::DynMdView<void> getExternalView() const;
/// Check whether this object is null
friend bool operator==(std::nullptr_t, const MemoryDescriptorRef& ref);
/// Check whether this object is null
friend bool operator==(const MemoryDescriptorRef& ref, std::nullptr_t);
/// Check whether this object is null
friend bool operator!=(std::nullptr_t, const MemoryDescriptorRef& ref);
/// Check whether this object is null
friend bool operator!=(const MemoryDescriptorRef& ref, std::nullptr_t);
private:
MemoryDescriptorView* m_parent = nullptr;
memory::DynMdSpan m_span;
};
std::ostream& operator<<(std::ostream& os, const MemoryDescriptorRef& ref);
}
#endif // MEMORY_DESCRIPTOR_REF_HPP
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