Reference example like the other languages, all working

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@4529 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/csharp/reference/runme.cs

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+// This example illustrates the manipulation of C++ references in C#.
+
+using System;
+
+public class runme {
+
+  public static void Main() 
+  {
+    Console.WriteLine( "Creating some objects:" );
+    Vector a = new Vector(3,4,5);
+    Vector b = new Vector(10,11,12);
+    
+    Console.WriteLine( "    Created " + a.print() );
+    Console.WriteLine( "    Created " + b.print() );
+    
+    // ----- Call an overloaded operator -----
+    
+    // This calls the wrapper we placed around
+    //
+    //      operator+(const Vector &a, const Vector &) 
+    //
+    // It returns a new allocated object.
+    
+    Console.WriteLine( "Adding a+b" );
+    Vector c = example.addv(a,b);
+    Console.WriteLine( "    a+b = " + c.print() );
+    
+    // Note: Unless we free the result, a memory leak will occur if the -noproxy commandline
+    // is used as the proxy classes define finalizers which call the Dispose() method. When
+    // -noproxy is not specified the memory management is controlled by the garbage collector.
+    // You can still call Dispose(). It will free the c++ memory immediately, but not the 
+    // C# memory! You then must be careful not to call any member functions as it will 
+    // use a NULL c pointer on the underlying c++ object. We set the C# object to null
+    // which will then throw a C# exception should we attempt to use it again.
+    c.Dispose();
+    c = null;
+    
+    // ----- Create a vector array -----
+    
+    Console.WriteLine( "Creating an array of vectors" );
+    VectorArray va = new VectorArray(10);
+    Console.WriteLine( "    va = " + va.ToString() );
+    
+    // ----- Set some values in the array -----
+    
+    // These operators copy the value of Vector a and Vector b to the vector array
+    va.set(0,a);
+    va.set(1,b);
+    
+    // This works, but it would cause a memory leak if -noproxy was used!
+    
+    va.set(2,example.addv(a,b));
+    
+
+    // Get some values from the array
+    
+    Console.WriteLine( "Getting some array values" );
+    for (int i=0; i<5; i++)
+        Console.WriteLine( "    va(" + i + ") = " + va.get(i).print() );
+    
+    // Watch under resource meter to check on this
+    Console.WriteLine( "Making sure we don't leak memory." );
+    for (int i=0; i<1000000; i++)
+        c = va.get(i%10);
+    
+    // ----- Clean up -----
+    // This could be omitted. The garbage collector would then clean up for us.
+    Console.WriteLine( "Cleaning up" );
+    va.Dispose();
+    a.Dispose();
+    b.Dispose();
+  }
+}