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diff --git a/reference_model/custom_op_example/custom_op_example.cpp b/reference_model/custom_op_example/custom_op_example.cpp
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+++ b/reference_model/custom_op_example/custom_op_example.cpp
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+// Copyright (c) 2023, ARM Limited.
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//         http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+
+#include "custom_op_interface.h"
+#include "custom_registry.h"
+#include <vector>
+
+using namespace tosa;
+
+namespace TosaReference
+{
+class CustomOpExample : public CustomOpInterface
+{
+public:
+    CustomOpExample() = default;
+    CustomOpExample(std::string& domain_name, std::string& operator_name, std::string& version)
+        : _domain_name(domain_name)
+        , _operator_name(operator_name)
+        , _version(version)
+    {}
+    int eval(std::vector<TosaReference::Tensor*>& input_tensors,
+             std::vector<TosaReference::Tensor*>& output_tensors,
+             const std::string& implementation_attrs) override
+    {
+        auto input_tensor_ptr  = input_tensors[0];
+        auto output_tensor_ptr = output_tensors[0];
+
+        // down_cast to EigenTensor
+        using TIn  = Eigen::Tensor<float, 1>;
+        using TOut = Eigen::Tensor<float, 1>;
+
+        auto eigenInputTensor  = reinterpret_cast<TosaReference::TensorTemplate<TIn>*>(input_tensor_ptr);
+        auto eigenOutputTensor = reinterpret_cast<TosaReference::TensorTemplate<TIn>*>(output_tensor_ptr);
+
+        // Assign the input to output as an example
+        // This is plug-in implementation specific
+        auto fcn                       = [](float a) -> float { return a; };
+        eigenOutputTensor->getTensor() = eigenInputTensor->getTensor().unaryExpr(fcn);
+
+        return 0;
+    };
+
+    std::string getDomainName() const override
+    {
+        return this->_domain_name;
+    }
+
+    std::string getOperatorName() const override
+    {
+        return this->_operator_name;
+    }
+
+    std::string getVersion() const override
+    {
+        return this->_version;
+    }
+
+    ~CustomOpExample(){};
+
+private:
+    std::string _domain_name;
+    std::string _operator_name;
+    std::string _version;
+};
+
+CustomOpInterface* customOpExample()
+{
+    std::string domain_name         = "ExampleDomain";
+    std::string operator_name       = "ExampleOp";
+    std::string version             = "1.0";
+    CustomOpInterface* customOp_ptr = new CustomOpExample(domain_name, operator_name, version);
+
+    return customOp_ptr;
+}
+
+extern "C" int getCustomOpCreationFuncs(registration_callback_t registration_func)
+{
+    std::string domain_name   = "ExampleDomain";
+    std::string operator_name = "ExampleOp";
+    return registration_func(domain_name, operator_name, &customOpExample);
+}
+
+}    // namespace TosaReference