Contract simple examples

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5078 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/contract/simple_c/example.i

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+/* File : example.i */
+
+/* Basic C example for swig contract */
+/* Tiger, University of Chicago, 2003 */
+
+%module example
+
+%contract Circle (int x, int y, int radius) {
+require:
+     x      >= 0;
+     y      >= 0;
+     radius >  x;
+ensure:
+     Circle >= 0;
+}
+
+extern int Circle (int x, int y, int radius);