Overloading the + operator to add two arrays

Question

What\'s wrong with this C# code? I tried to overload the + operator to add two arrays, but got an error message as follows:

One of the parameters of a binary operato

Answer 1

You can use something like this:

class Program {
  static void Main(string[] args) {
    const int n = 5;

    var a = new int[n] { 1, 2, 3, 4, 5 }.WithOperators();
    var b = new int[n] { 5, 4, 3, 2, 1 };

    int[] c = a + b;

    for (int i = 0; i < c.Length; i++) {
      Console.Write("{0} ", c[i]);
    }

    Console.WriteLine();
  }
}

public static class Int32ArrayExtensions {
  public static Int32ArrayWithOperators WithOperators(this int[] self) {
    return self;
  }
}

public class Int32ArrayWithOperators {
  int[] _array;

  public Int32ArrayWithOperators(int[] array) {
    if (array == null) throw new ArgumentNullException("array");
    _array = array; 
  }

  public static implicit operator Int32ArrayWithOperators(int[] array) {
    return new Int32ArrayWithOperators(array); 
  }
  public static implicit operator int[](Int32ArrayWithOperators wrapper) {
    return wrapper._array;
  }

  public static Int32ArrayWithOperators operator +(Int32ArrayWithOperators left, Int32ArrayWithOperators right) {
    var x = left._array;
    var y = right._array;
    return x.Zip(y, (a, b) => a + b).ToArray();
  }
}

Based on a related post that I wrote.