// functional/FunctionVariants.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.function.*;

class Foo {}

class Bar {
 Foo f;
 Bar(Foo f) { this.f = f; }
}

class IBaz {
 int i;
 IBaz(int i) {
 this.i = i;
 }
}

class LBaz {
 long l;
 LBaz(long l) {
 this.l = l;
 }
}

class DBaz {
 double d;
 DBaz(double d) {
 this.d = d;
 }
}

public class FunctionVariants {
 static Function<Foo,Bar> f1 = f -> new Bar(f);
 static IntFunction<IBaz> f2 = i -> new IBaz(i);
 static LongFunction<LBaz> f3 = l -> new LBaz(l);
 static DoubleFunction<DBaz> f4 = d -> new DBaz(d);
 static ToIntFunction<IBaz> f5 = ib -> ib.i;
 static ToLongFunction<LBaz> f6 = lb -> lb.l;
 static ToDoubleFunction<DBaz> f7 = db -> db.d;
 static IntToLongFunction f8 = i -> i;
 static IntToDoubleFunction f9 = i -> i;
 static LongToIntFunction f10 = l -> (int)l;
 static LongToDoubleFunction f11 = l -> l;
 static DoubleToIntFunction f12 = d -> (int)d;
 static DoubleToLongFunction f13 = d -> (long)d;

 public static void main(String[] args) {
 Bar b = f1.apply(new Foo());
 IBaz ib = f2.apply(11);
 LBaz lb = f3.apply(11);
 DBaz db = f4.apply(11);
 int i = f5.applyAsInt(ib);
 long l = f6.applyAsLong(lb);
 double d = f7.applyAsDouble(db);
 l = f8.applyAsLong(12);
 d = f9.applyAsDouble(12);
 i = f10.applyAsInt(12);
 d = f11.applyAsDouble(12);
 i = f12.applyAsInt(13.0);
 l = f13.applyAsLong(13.0);
 }
}