Draft: Change ReduceMean attribute 'axes' from static array to dynamic vector

include/aidge/backend/cpu/operator/UnsqueezeImpl.hpp

+/********************************************************************************
+ * Copyright (c) 2023 CEA-List
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ ********************************************************************************/
+
+#ifndef AIDGE_CPU_OPERATOR_UNSQUEEZEIMPL_H_
+#define AIDGE_CPU_OPERATOR_UNSQUEEZEIMPL_H_
+
+#include <memory>
+#include <vector>
+
+#include "aidge/backend/OperatorImpl.hpp"
+#include "aidge/operator/Unsqueeze.hpp"
+#include "aidge/utils/Registrar.hpp"
+#include "aidge/utils/Types.h"
+
+namespace Aidge {
+// class Unsqueeze_Op;
+
+class UnsqueezeImplForward_cpu
+    : public Registrable<
+          UnsqueezeImplForward_cpu, std::tuple<DataType, DataType>,
+          void(const Unsqueeze_Op::Attrs &, const std::vector<DimSize_t> &,
+               const void *, void *)> {};
+
+class UnsqueezeImplBackward_cpu
+    : public Registrable<
+          UnsqueezeImplBackward_cpu, std::tuple<DataType, DataType>,
+          void(const Unsqueeze_Op::Attrs &, const std::vector<DimSize_t> &,
+               const void *, void *)> {};
+
+class UnsqueezeImpl_cpu : public OperatorImpl {
+public:
+  UnsqueezeImpl_cpu(const Unsqueeze_Op &op) : OperatorImpl(op, "cpu") {}
+
+  static std::unique_ptr<UnsqueezeImpl_cpu> create(const Unsqueeze_Op &op) {
+    return std::make_unique<UnsqueezeImpl_cpu>(op);
+  }
+
+  void forward() override;
+};
+
+namespace {
+static Registrar<Unsqueeze_Op>
+    registrarUnsqueezeImpl_cpu("cpu", Aidge::UnsqueezeImpl_cpu::create);
+}
+} // namespace Aidge
+
+#endif /* _AIDGE_CPU_OPERATOR_UNSQUEEZEIMPL_H_ */