javaslang

Interface λ<R>

Type Parameters:

R - Return type of the function.

All Superinterfaces:

Serializable

All Known Subinterfaces:

BitSet<T>, CheckedFunction0<R>, CheckedFunction1<T1,R>, CheckedFunction2<T1,T2,R>, CheckedFunction3<T1,T2,T3,R>, CheckedFunction4<T1,T2,T3,T4,R>, CheckedFunction5<T1,T2,T3,T4,T5,R>, CheckedFunction6<T1,T2,T3,T4,T5,T6,R>, CheckedFunction7<T1,T2,T3,T4,T5,T6,T7,R>, CheckedFunction8<T1,T2,T3,T4,T5,T6,T7,T8,R>, Function0<R>, Function1<T1,R>, Function2<T1,T2,R>, Function3<T1,T2,T3,R>, Function4<T1,T2,T3,T4,R>, Function5<T1,T2,T3,T4,T5,R>, Function6<T1,T2,T3,T4,T5,T6,R>, Function7<T1,T2,T3,T4,T5,T6,T7,R>, Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>, IndexedSeq<T>, LinearSeq<T>, List<T>, Map<K,V>, Multimap<K,V>, Seq<T>, Set<T>, SortedMap<K,V>, SortedSet<T>, Stream<T>

All Known Implementing Classes:

Array, CharSeq, HashMap, HashMultimap, HashSet, LinkedHashMap, LinkedHashMultimap, LinkedHashSet, List.Cons, List.Nil, Queue, Stream.Cons, Stream.Empty, TreeMap, TreeMultimap, TreeSet, Vector

public interface λ<R>
extends Serializable

This is a general definition of a (checked/unchecked) function of unknown parameters and a return type R.

A checked function may throw an exception. The exception type cannot be expressed as a generic type parameter because Java cannot calculate type bounds on function composition.

Since:

1.0.0

Author:

Daniel Dietrich

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	λ.Memoized Zero Abstract Method (ZAM) interface for marking functions as memoized using intersection types.

Field Summary

Fields

Modifier and Type	Field and Description
static long	serialVersionUID The serial version uid.

Method Summary

Modifier and Type	Method and Description
int	arity()
λ<?>	curried() Returns a curried version of this function.
default boolean	isMemoized() Checks if this function is memoizing (= caching) computed values.
λ<R>	memoized() Returns a memoizing version of this function, which computes the return value for given arguments only one time.
λ<R>	reversed() Returns a reversed version of this function.
λ<R>	tupled() Returns a tupled version of this function.

Field Detail

serialVersionUID

static final long serialVersionUID

The serial version uid.

See Also:

Constant Field Values

Method Detail

arity

int arity()

Returns:

the number of function arguments.

See Also:

Arity

curried

λ<?> curried()

Returns a curried version of this function.

Returns:

a curried function equivalent to this.

tupled

λ<R> tupled()

Returns a tupled version of this function.

Returns:

a tupled function equivalent to this.

reversed

λ<R> reversed()

Returns a reversed version of this function. This may be useful in a recursive context.

Returns:

a reversed function equivalent to this.

memoized

λ<R> memoized()

Returns a memoizing version of this function, which computes the return value for given arguments only one time. On subsequent calls given the same arguments the memoized value is returned.

Please note that memoizing functions do not permit null as single argument or return value.

Returns:

a memoizing function equivalent to this.

isMemoized

default boolean isMemoized()

Checks if this function is memoizing (= caching) computed values.

Returns:

true, if this function is memoizing, false otherwise