[lua] added %luacode feature, documentation & examples

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10312 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/lua/arrays/example.c

@@ -0,0 +1,25 @@
+/* File : example.c */
+
+#include <stdlib.h>
+
+/* we are using the qsort function, which needs a helper function to sort */
+int compare_int(const void * a, const void * b)
+{
+  return ( *(int*)a - *(int*)b );
+}
+
+void sort_int(int* arr, int len)
+{
+  qsort(arr, len, sizeof(int), compare_int);
+}
+
+// ditto doubles
+int compare_double(const void * a, const void * b)
+{
+  return ( *(double*)a - *(double*)b );
+}
+
+void sort_double(double* arr, int len)
+{
+  qsort(arr, len, sizeof(double), compare_double);
+}