1  #pragma once
 2  
 3  #include "Calculator.g.h"
 4  
 5  namespace winrt::CalculatorEngineCommon::implementation
 6  {
 7      struct Calculator : CalculatorT<Calculator>
 8      {
 9          Calculator() = default;
10  
11          Calculator(winrt::Windows::Foundation::Collections::IPropertySet const& constants);
12  
13          winrt::hstring EvaluateExpression(winrt::hstring const& expression);
14  
15      private:
16          std::unordered_map<std::string, double> m_constants;
17      };
18  }
19  
20  namespace winrt::CalculatorEngineCommon::factory_implementation
21  {
22      struct Calculator : CalculatorT<Calculator, implementation::Calculator>
23      {
24      };
25  }