Add basic Operator interface

- C facing interfaces
- Activation layer descriptor

Partially Resolves: COMPMID-4512

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I8530748fff178ca46d61bf2e40d3e543e93f340b
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5908
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/c/AclOperator.cpp b/src/c/AclOperator.cpp
new file mode 100644
index 0000000..992cee1
--- /dev/null
+++ b/src/c/AclOperator.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/AclEntrypoints.h"
+
+#include "src/common/IOperator.h"
+#include "src/common/IQueue.h"
+#include "src/common/TensorPack.h"
+#include "src/common/utils/Macros.h"
+
+extern "C" AclStatus AclRunOperator(AclOperator external_op, AclQueue external_queue, AclTensorPack external_tensors)
+{
+    using namespace arm_compute;
+
+    auto op    = get_internal(external_op);
+    auto queue = get_internal(external_queue);
+    auto pack  = get_internal(external_tensors);
+
+    StatusCode status = StatusCode::Success;
+    status            = detail::validate_internal_operator(op);
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+    status = detail::validate_internal_queue(queue);
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+    status = detail::validate_internal_pack(pack);
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+
+    status = op->run(*queue, pack->get_tensor_pack());
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+
+    return AclSuccess;
+}
+
+extern "C" AclStatus AclDestroyOperator(AclOperator external_op)
+{
+    using namespace arm_compute;
+
+    auto op = get_internal(external_op);
+
+    StatusCode status = detail::validate_internal_operator(op);
+    ARM_COMPUTE_RETURN_CENUM_ON_FAILURE(status);
+
+    delete op;
+
+    return AclSuccess;
+}