// Compile:
// gmcs -unsafe sumWrapper.cs
// Execute:
// mono sumWrapper.exe
// -----------------------------------------------------------------------------

using System;
using System.Runtime.InteropServices;

public class Tester {
  [DllImport ("libsum.so", EntryPoint="sum")]
  static unsafe extern int sum(int *p, int n);

  unsafe static void Main () {
    int []arr = new int[10];
    for (int i = 0; i<arr.Length; i++) { arr[i]=i; }
    fixed (int *p = arr) {
      Console.WriteLine("array initialised to [0..9] = {0}", showArr(arr));
      int s = sum(p, 10);
      Console.WriteLine("sum of array, computed on C side {0}", s);
    }
  }

   static string showArr(int[] arr) {
     string s = "";
     foreach (int i in arr) {
      if (s!="") {
        s += ',';
      }
      s += i.ToString();
     }
     return s;
   }
}