using System;
namespace SafeEfficientCode
{
class Program
{
static void Main(string[] args)
{
var pt1 = new Point3D { X = 3, Y = 4, Z = 5 };
var pt2 = new Point3D { X = 10, Y = 8, Z = 5 };
#region UseInArgument
var distance = CalculateDistance(pt1, pt2);
var fromOrigin = CalculateDistance(pt1, new Point3D());
#endregion
#region ExplicitInArgument
distance = CalculateDistance(in pt1, in pt2);
distance = CalculateDistance(in pt1, new Point3D());
distance = CalculateDistance(pt1, in Point3D.Origin);
#endregion
fromOrigin = CalculateDistance2(pt1);
#region AssignRefReadonly
var originValue = Point3D.Origin;
ref readonly var originReference = ref Point3D.Origin;
#endregion
}
#region ByValue
private static double CalculateDistance(Point3D point1, Point3D point2)
{
double xDifference = point1.X - point2.X;
double yDifference = point1.Y - point2.Y;
double zDifference = point1.Z - point2.Z;
return Math.Sqrt(xDifference * xDifference + yDifference * yDifference + zDifference * zDifference);
}
#endregion
#region InArgument
private static double CalculateDistance(in Point3D point1, in Point3D point2)
{
double xDifference = point1.X - point2.X;
double yDifference = point1.Y - point2.Y;
double zDifference = point1.Z - point2.Z;
return Math.Sqrt(xDifference * xDifference + yDifference * yDifference + zDifference * zDifference);
}
#endregion
#region InArgumentDefault
private static double CalculateDistance2(in Point3D point1, in Point3D point2 = default)
{
double xDifference = point1.X - point2.X;
double yDifference = point1.Y - point2.Y;
double zDifference = point1.Z - point2.Z;
return Math.Sqrt(xDifference * xDifference + yDifference * yDifference + zDifference * zDifference);
}
#endregion
#region ReadOnlyInArgument
private static double CalculateDistance3(in ReadonlyPoint3D point1, in ReadonlyPoint3D point2 = default)
{
double xDifference = point1.X - point2.X;
double yDifference = point1.Y - point2.Y;
double zDifference = point1.Z - point2.Z;
return Math.Sqrt(xDifference * xDifference + yDifference * yDifference + zDifference * zDifference);
}
#endregion
}
}