Added default operator impl with default producer-consumer model

This update simplifies a lot the implementations, by providing a default producer-consumer model to the base OperatorImpl class!

The change is relatively minor and should not jeopardize potential future refactoring around operators modeling.

For the default producer-consumer model, the assertion made is simple: the full input tensors are consumed and the full output tensors are produced at each forward execution. Futhermore, input tensors cannot be overwritten during execution (the operation is not in-place).

include/aidge/backend/OperatorImpl.hpp

@@ -18,11 +18,13 @@
 #include "aidge/utils/Types.h"
 
 namespace Aidge {
+class Operator;
+
 class OperatorImpl {
 public:
-
-    virtual void forward(){};
-    virtual void backward(){};
+    OperatorImpl(const Operator& op);
+    virtual void forward();
+    virtual void backward();
 
     /**
      * @brief Minimum amount of data from a specific input required by the
@@ -31,13 +33,13 @@ public:
      * @param inputIdx Index of the input analysed.
      * @return std::size_t
      */
-    virtual NbElts_t getNbRequiredData(const IOIndex_t inputIdx) const = 0;
+    virtual NbElts_t getNbRequiredData(const IOIndex_t inputIdx) const;
 
     // Amount of input data that cannot be overwritten during the execution.
-    virtual NbElts_t getNbRequiredProtected(const IOIndex_t inputIdx) const = 0;
+    virtual NbElts_t getNbRequiredProtected(const IOIndex_t inputIdx) const;
 
     // Memory required at an output for a given input size.
-    virtual NbElts_t getRequiredMemory(const IOIndex_t outputIdx, const std::vector<DimSize_t> &inputsSize) const = 0;
+    virtual NbElts_t getRequiredMemory(const IOIndex_t outputIdx, const std::vector<DimSize_t> &inputsSize) const;
 
     /**
      * @brief Total amount of consumed data from a specific input.
@@ -45,7 +47,7 @@ public:
      * @param inputIdx Index of the input analysed.
      * @return DimSize_t
      */
-    virtual NbElts_t getNbConsumedData(const IOIndex_t inputIdx) const = 0;
+    virtual NbElts_t getNbConsumedData(const IOIndex_t inputIdx) const;
 
     /**
      * @brief Total amount of produced data ready to be used on a specific output.
@@ -53,15 +55,20 @@ public:
      * @param outputIdx Index of the output analysed.
      * @return DimSize_t
      */
-    virtual NbElts_t getNbProducedData(const IOIndex_t outputIdx) const = 0;
+    virtual NbElts_t getNbProducedData(const IOIndex_t outputIdx) const;
 
     /**
      * @brief Update the Consummer Producer system by simulating the consumption and production of i/o
      *
      */
-    virtual void updateConsummerProducer() = 0;
+    virtual void updateConsummerProducer();
 
     virtual ~OperatorImpl() = default;
+
+protected:
+    const Operator &mOp;
+    std::vector<NbElts_t> mNbConsumedData;
+    std::vector<NbElts_t> mNbProducedData;
 };
 } // namespace Aidge