CalcLibrary.cs

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#pragma warning disable 1587
#pragma warning restore 1587
 
using CalcLib.Internal;
 
namespace CalcLib
{
    public static class CalcLibrary
    {
        private const int CALC_SUCCESS = 0;

        private const int CALC_ERROR = -1;

        public static CalcResult Calculate(CalcKind kind, int a, int b)
        {
            int returnCode = NativeMethods.CalcHandler((int)kind, a, b, out int result);
            return new CalcResult(
                isSuccess: returnCode == CALC_SUCCESS,
                value: result,
                errorCode: returnCode
            );
        }

        public static int CalculateOrThrow(CalcKind kind, int a, int b)
        {
            var result = Calculate(kind, a, b);
            if (!result.IsSuccess)
            {
                throw new CalcException(
                    result.ErrorCode,
                    $"Calculation failed: kind={kind}, a={a}, b={b}, errorCode={result.ErrorCode}");
            }
            return result.Value;
        }

        public static CalcResult Add(int a, int b) => Calculate(CalcKind.Add, a, b);

        public static CalcResult Subtract(int a, int b) => Calculate(CalcKind.Subtract, a, b);

        public static CalcResult Multiply(int a, int b) => Calculate(CalcKind.Multiply, a, b);

        public static CalcResult Divide(int a, int b) => Calculate(CalcKind.Divide, a, b);
    }
}