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+/* -----------------------------------------------------------------------------
+ * arrays_csharp.i
+ *
+ * This file contains a two approaches to marshaling arrays. The first uses
+ * default p/invoke marshaling and the second uses pinning of the arrays.
+ *
+ * Default marshaling approach
+ * ----------------------------
+ * Array typemaps using default p/invoke marshaling. The data is copied to a separately
+ * allocated buffer when passing over the managed-native boundary.
+ * 
+ * There are separate typemaps for in, out and inout arrays to enable avoiding 
+ * unnecessary copying.
+ * 
+ * Example usage:
+ *
+ *   %include "arrays_csharp.i"
+ *   %apply int INPUT[]  { int* sourceArray }
+ *   %apply int OUTPUT[] { int* targetArray }
+ *   void myArrayCopy( int* sourceArray, int* targetArray, int nitems );
+ *
+ *   %apply int INOUT[] { int* array1, int *array2 }
+ *   void myArraySwap( int* array1, int* array2, int nitems );
+ *
+ * If handling large arrays you should consider using the pinning array typemaps
+ * described next.
+ *
+ * Pinning approach
+ * ----------------
+ * Array typemaps using pinning. These typemaps pin the managed array given
+ * as parameter and pass a pointer to it to the c/c++ side. This is very
+ * efficient as no copying is done (unlike in the default array marshaling),
+ * but it makes garbage collection more difficult. When considering using
+ * these typemaps, think carefully whether you have callbacks that may cause
+ * the control to re-enter the managed side from within the call (and produce
+ * garbage for the gc) or whether other threads may produce enough garbage to 
+ * trigger gc while the call is being executed. In those cases it may be
+ * wiser to use the default marshaling typemaps.
+ * 
+ * Please note that when using fixed arrays, you have to mark your corresponding 
+ * module class method unsafe using 
+ * %csmethodmodifiers "public unsafe"
+ * (the visibility of the method is up to you).
+ *
+ * Example usage:
+ *
+ *   %include "arrays_csharp.i"
+ *   %apply int FIXED[] { int* sourceArray, int *targetArray }
+ *   %csmethodmodifiers myArrayCopy "public unsafe";
+ *   void myArrayCopy( int *sourceArray, int* targetArray, int nitems );
+ *
+ * ----------------------------------------------------------------------------- */
+
+%define CSHARP_ARRAYS( CTYPE, CSTYPE )
+
+// input only arrays
+
+%typemap(ctype)   CTYPE INPUT[] "CTYPE*"
+%typemap(cstype)  CTYPE INPUT[] "CSTYPE[]"
+%typemap(imtype, inattributes="[In, MarshalAs(UnmanagedType.LPArray)]") CTYPE INPUT[] "CSTYPE[]"
+%typemap(csin)    CTYPE INPUT[] "$csinput"
+
+%typemap(in)      CTYPE INPUT[] "$1 = $input;"
+%typemap(freearg) CTYPE INPUT[] ""
+%typemap(argout)  CTYPE INPUT[] ""
+
+// output only arrays
+
+%typemap(ctype)   CTYPE OUTPUT[] "CTYPE*"
+%typemap(cstype)  CTYPE OUTPUT[] "CSTYPE[]"
+%typemap(imtype, inattributes="[Out, MarshalAs(UnmanagedType.LPArray)]") CTYPE OUTPUT[] "CSTYPE[]"
+%typemap(csin)    CTYPE OUTPUT[] "$csinput"
+
+%typemap(in)      CTYPE OUTPUT[] "$1 = $input;"
+%typemap(freearg) CTYPE OUTPUT[] ""
+%typemap(argout)  CTYPE OUTPUT[] ""
+
+// inout arrays
+
+%typemap(ctype)   CTYPE INOUT[] "CTYPE*"
+%typemap(cstype)  CTYPE INOUT[] "CSTYPE[]"
+%typemap(imtype, inattributes="[In, Out, MarshalAs(UnmanagedType.LPArray)]") CTYPE INOUT[] "CSTYPE[]"
+%typemap(csin)    CTYPE INOUT[] "$csinput"
+
+%typemap(in)      CTYPE INOUT[] "$1 = $input;"
+%typemap(freearg) CTYPE INOUT[] ""
+%typemap(argout)  CTYPE INOUT[] ""
+
+%enddef // CSHARP_ARRAYS
+
+CSHARP_ARRAYS(signed char, sbyte)
+CSHARP_ARRAYS(unsigned char, byte)
+CSHARP_ARRAYS(short, short)
+CSHARP_ARRAYS(unsigned short, ushort)
+CSHARP_ARRAYS(int, int)
+CSHARP_ARRAYS(unsigned int, uint)
+// FIXME - on Unix 64 bit, long is 8 bytes but is 4 bytes on Windows 64 bit.
+//         How can this be handled sensibly?
+//         See e.g. http://www.xml.com/ldd/chapter/book/ch10.html
+CSHARP_ARRAYS(long, int)
+CSHARP_ARRAYS(unsigned long, uint)
+CSHARP_ARRAYS(long long, long)
+CSHARP_ARRAYS(unsigned long long, ulong)
+CSHARP_ARRAYS(float, float)
+CSHARP_ARRAYS(double, double)
+
+
+%define CSHARP_ARRAYS_FIXED( CTYPE, CSTYPE )
+
+%typemap(ctype)   CTYPE FIXED[] "CTYPE*"
+%typemap(imtype)  CTYPE FIXED[] "IntPtr"
+%typemap(cstype)  CTYPE FIXED[] "CSTYPE[]"
+%typemap(csin,
+           pre=       "    fixed ( CSTYPE* swig_ptrTo_$csinput = $csinput ) {",
+           terminator="    }") 
+                  CTYPE FIXED[] "(IntPtr)swig_ptrTo_$csinput"
+
+%typemap(in)      CTYPE FIXED[] "$1 = $input;"
+%typemap(freearg) CTYPE FIXED[] ""
+%typemap(argout)  CTYPE FIXED[] ""
+
+
+%enddef // CSHARP_ARRAYS_FIXED
+
+CSHARP_ARRAYS_FIXED(signed char, sbyte)
+CSHARP_ARRAYS_FIXED(unsigned char, byte)
+CSHARP_ARRAYS_FIXED(short, short)
+CSHARP_ARRAYS_FIXED(unsigned short, ushort)
+CSHARP_ARRAYS_FIXED(int, int)
+CSHARP_ARRAYS_FIXED(unsigned int, uint)
+CSHARP_ARRAYS_FIXED(long, int)
+CSHARP_ARRAYS_FIXED(unsigned long, uint)
+CSHARP_ARRAYS_FIXED(long long, long)
+CSHARP_ARRAYS_FIXED(unsigned long long, ulong)
+CSHARP_ARRAYS_FIXED(float, float)
+CSHARP_ARRAYS_FIXED(double, double)
+