@Test
public void test0() {
Function<Integer, Integer> f = ((Integer) 0)::compareTo;
Function<Integer, Integer> f1 = f.compose(f);
// f1 does what?!
}
@Test
public void test1() {
Function<Integer, Integer> f = ((Integer) 0)::compareTo;
f = f.compose(f);
Assert.assertEquals(Integer.valueOf(0), f.apply(0));
Assert.assertEquals(Integer.valueOf(1), f.apply(100));
Assert.assertEquals(Integer.valueOf(-1), f.apply(-100));
}
@Override
public Function<Object[], ?> visit(LambdaExpression<?> e) {
final Function<Object[], ?> f = e.getBody().accept(this);
int size = e.getParameters().size();
List<Function<Object[], ?>> ppe = new ArrayList<>(size);
for (ParameterExpression p : e.getParameters()) ppe.add(p.accept(this));
Function<Object[], Object[]> params =
pp -> {
Object[] r = new Object[ppe.size()];
int index = 0;
for (Function<Object[], ?> pe : ppe) {
r[index++] = pe.apply(pp);
}
return r;
};
return f.compose(params);
}
@Override
public Function<Object[], ?> visit(InvocationExpression e) {
final Function<Object[], ?> m = e.getTarget().accept(this);
int size = e.getArguments().size();
List<Function<Object[], ?>> ppe = new ArrayList<>(size);
for (Expression p : e.getArguments()) ppe.add(p.accept(this));
Function<Object[], Object[]> params =
pp -> {
Object[] r = new Object[ppe.size()];
int index = 0;
for (Function<Object[], ?> pe : ppe) {
r[index++] = pe.apply(pp);
}
return r;
};
return m.compose(params);
}
/**
* Create a new evolution {@code Engine.Builder} with the given fitness function and problem
* {@code codec}.
*
* @since 3.2
* @param ff the fitness function
* @param codec the problem codec
* @param <T> the fitness function input type
* @param <C> the fitness function result type
* @param <G> the gene type
* @return a new engine builder
* @throws java.lang.NullPointerException if one of the arguments is {@code null}.
*/
public static <T, G extends Gene<?, G>, C extends Comparable<? super C>> Builder<G, C> builder(
final Function<? super T, ? extends C> ff, final Codec<T, G> codec) {
return builder(ff.compose(codec.decoder()), codec.encoding());
}