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Examples/test-suite/java/virtual_poly_runme.java
61 строка
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Marcelo Matus
added a reference polymorphic return type case, and
24 дек 2003, 09:53
24 дек 2003, 09:53
ac01119
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// virtual_poly test import virtual_poly.*; public class virtual_poly_runme { static { try { System.loadLibrary("virtual_poly"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e); System.exit(1); } } public static void main(String argv[]) { NDouble d = new NDouble(3.5); NInt i = new NInt(2); // // These two natural 'copy' forms fail because no covariant (polymorphic) return types // are supported in Java. // // NDouble dc = d.copy(); // NInt ic = i.copy(); // // Unlike C++, we have to downcast instead. // NDouble dc = (NDouble)d.copy(); NInt ic = (NInt)i.copy(); NDouble ddc = NDouble.narrow(dc); NInt dic = NInt.narrow(ic); virtual_poly.incr(ic); if ( (i.get() + 1) != ic.get() ) throw new RuntimeException("incr test failed"); // // Checking a pure user downcast // NNumber n1 = d.copy(); NNumber n2 = d.nnumber(); NDouble dn1 = NDouble.narrow(n1); NDouble dn2 = NDouble.narrow(n2); if ( (dn1.get()) != dn2.get() ) throw new RuntimeException("copy/narrow test failed"); // // Checking the ref polymorphic case // NNumber nr = d.ref_this(); NDouble dr1 = NDouble.narrow(nr); NDouble dr2 = (NDouble)d.ref_this(); if ( dr1.get() != dr2.get() ) throw new RuntimeException("copy/narrow test failed"); } }