calculator_impl.cpp

#include "calculator_impl.hpp"
#include <string>

namespace calculator{
    std::shared_ptr<Calculator> Calculator::create() {
        return std::make_shared<CalculatorImpl>();
    }
  
    CalculatorImpl::CalculatorImpl() {}
  
    int32_t CalculatorImpl::summation(int32_t number1, int32_t number2) {
        int32_t result = number1 + number2;
        return result;
    }
}

calculator_impl.hpp

#pragma once
#include "calculator.hpp"

namespace calculator {
    class CalculatorImpl : public calculator::Calculator {
    public:
        CalculatorImpl();
        int32_t summation(int32_t number1, int32_t number2);
    };
}