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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "Layer.hpp"
#include "Graph.hpp"
#include <vector>
#include <list>
namespace armnn
{
///
/// The SubgraphView class represents a subgraph of a Graph.
/// The data it holds, points to data held by layers of the Graph, so the
/// the contents of the SubgraphView becomes invalid when the Layers are destroyed
/// or changed.
///
class SubgraphView final
{
public:
using SubgraphViewPtr = std::unique_ptr<SubgraphView>;
using InputSlots = std::vector<InputSlot*>;
using OutputSlots = std::vector<OutputSlot*>;
using Layers = std::list<Layer*>;
using Iterator = Layers::iterator;
using ConstIterator = Layers::const_iterator;
/// Empty subgraphs are not allowed, they must at least have a parent graph.
SubgraphView() = delete;
/// Constructs a sub-graph from the entire given graph.
SubgraphView(Graph& graph);
/// Constructs a sub-graph with the given arguments and binds it to the specified parent graph.
SubgraphView(Graph* parentGraph, InputSlots&& inputs, OutputSlots&& outputs, Layers&& layers);
/// Constructs a sub-graph with the given arguments and uses the specified sub-graph to get a reference
/// to the parent graph.
SubgraphView(const SubgraphView& referenceSubgraph, InputSlots&& inputs, OutputSlots&& outputs, Layers&& layers);
/// Copy-constructor.
SubgraphView(const SubgraphView& subgraph);
/// Move-constructor.
SubgraphView(SubgraphView&& subgraph);
/// Constructs a sub-graph with only the given layer and uses the specified sub-graph to get a reference
/// to the parent graph.
SubgraphView(const SubgraphView& referenceSubgraph, IConnectableLayer* layer);
/// Updates this sub-graph with the contents of the whole given graph.
void Update(Graph& graph);
/// Adds a new layer, of type LayerType, to the parent graph of this sub-graph.
template <typename LayerT, typename... Args>
LayerT* AddLayer(Args&&... args) const;
const InputSlots& GetInputSlots() const;
const OutputSlots& GetOutputSlots() const;
const Layers& GetLayers() const;
const InputSlot* GetInputSlot(unsigned int index) const;
InputSlot* GetInputSlot(unsigned int index);
const OutputSlot* GetOutputSlot(unsigned int index) const;
OutputSlot* GetOutputSlot(unsigned int index);
unsigned int GetNumInputSlots() const;
unsigned int GetNumOutputSlots() const;
Iterator begin();
Iterator end();
ConstIterator begin() const;
ConstIterator end() const;
ConstIterator cbegin() const;
ConstIterator cend() const;
private:
void CheckSubgraph();
/// The list of pointers to the input slots of the parent graph.
InputSlots m_InputSlots;
/// The list of pointers to the output slots of the parent graph.
OutputSlots m_OutputSlots;
/// The list of pointers to the layers of the parent graph.
Layers m_Layers;
/// Pointer to the graph this sub-graph is a view of.
Graph* m_ParentGraph;
};
template <typename LayerT, typename... Args>
LayerT* SubgraphView::AddLayer(Args&&... args) const
{
BOOST_ASSERT(m_ParentGraph);
return m_ParentGraph->AddLayer<LayerT>(args...);
}
} // namespace armnn
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