mirror of https://github.com/swig/swig
62 lines
1.5 KiB
Java
62 lines
1.5 KiB
Java
// virtual_poly test
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import virtual_poly.*;
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public class virtual_poly_runme {
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static {
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try {
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System.loadLibrary("virtual_poly");
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} catch (UnsatisfiedLinkError e) {
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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);
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System.exit(1);
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}
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}
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public static void main(String argv[]) {
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NDouble d = new NDouble(3.5);
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NInt i = new NInt(2);
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//
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// These two natural 'copy' forms fail because no covariant (polymorphic) return types
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// are supported in Java.
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//
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// NDouble dc = d.copy();
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// NInt ic = i.copy();
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//
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// Unlike C++, we have to downcast instead.
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//
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NDouble dc = (NDouble)d.copy();
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NInt ic = (NInt)i.copy();
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NDouble ddc = NDouble.narrow(dc);
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NInt dic = NInt.narrow(ic);
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virtual_poly.incr(ic);
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if ( (i.get() + 1) != ic.get() )
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throw new RuntimeException("incr test failed");
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//
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// Checking a pure user downcast
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//
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NNumber n1 = d.copy();
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NNumber n2 = d.nnumber();
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NDouble dn1 = NDouble.narrow(n1);
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NDouble dn2 = NDouble.narrow(n2);
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if ( (dn1.get()) != dn2.get() )
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throw new RuntimeException("copy/narrow test failed");
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//
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// Checking the ref polymorphic case
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//
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NNumber nr = d.ref_this();
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NDouble dr1 = NDouble.narrow(nr);
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NDouble dr2 = (NDouble)d.ref_this();
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if ( dr1.get() != dr2.get() )
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throw new RuntimeException("copy/narrow test failed");
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}
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}
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