Contract simple examples

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

Examples/contract/simple_cxx/example.i

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+%module example
+
+%contract Circle::Circle(double radius) {
+require:
+    radius > 0;
+}
+
+%contract Circle::area(void) {
+ensure:
+    area > 0;
+}
+
+%contract Shape::move(double dx, double dy) {
+require:
+    dx > 0;
+}
+
+/* should be no effect, since there is no move() for class Circle */
+%contract Circle::move(double dx, double dy) {
+require:
+    dy > 1;
+}
+
+# include must be after contracts
+%{
+#include "example.h"
+%}
+%include "example.h"