Type Parameters:

R - see IntFunction

All Superinterfaces:

IntFunction<Optional<R>>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface OptionalIntFunction<R>
extends IntFunction<Optional<R>>
```
Variation of IntFunction that returns Optional instead of the raw value. OptionalIntFunction is typically obtained from ExceptionHandler.fromIntFunction(IntFunction), in which case its return value is empty when the underlying IntFunction throws an exception. See noexception tutorial.

See Also:

ExceptionHandler.fromIntFunction(IntFunction), IntFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`Optional<R>`	`apply(int value)` Variation of `IntFunction.apply(int)` that returns `Optional`.
`default IntFunction<R>`	`orElse(R result)` Convert this `OptionalIntFunction` to plain `IntFunction` using default value.
`default IntFunction<R>`	`orElseGet(Supplier<R> source)` Convert this `OptionalIntFunction` to plain `IntFunction` using fallback `Supplier`.

- Method Detail
  - apply
```
Optional<R> apply(int value)
```
    Variation of IntFunction.apply(int) that returns Optional. If this OptionalIntFunction is obtained from ExceptionHandler.fromIntFunction(IntFunction), the Optional will be empty only if the underlying IntFunction throws. Otherwise the returned Optional just wraps the return value of underlying IntFunction (possibly null).
    
    Specified by:
    
    apply in interface IntFunction<Optional<R>>
    
    Parameters:
    
    value - see IntFunction.apply(int)
    
    Returns:
    
    Optional typically wrapping return value of IntFunction.apply(int), or an empty Optional (typically signifying an exception)
    
    See Also:
    
    ExceptionHandler.fromIntFunction(IntFunction), IntFunction.apply(int)
  - orElse
```
default IntFunction<R> orElse(R result)
```
    Convert this OptionalIntFunction to plain IntFunction using default value. The returned IntFunction will unwrap present value from the Optional if possible, or return result if the Optional is empty.
    
    Parameters:
    
    result - default value to return instead of an empty Optional
    
    Returns:
    
    plain IntFunction that either unwraps Optional or returns default value
    
    See Also:
    
    orElseGet(Supplier), Optional.orElse(Object)
  - orElseGet
```
default IntFunction<R> orElseGet(Supplier<R> source)
```
    Convert this OptionalIntFunction to plain IntFunction using fallback Supplier. The returned IntFunction will unwrap present value from the Optional if possible, or fall back to calling source if the Optional is empty.
    
    Parameters:
    
    source - Supplier to query for fallback value when Optional is empty
    
    Returns:
    
    plain IntFunction that either unwraps Optional or falls back to source
    
    See Also:
    
    orElse(Object), Optional.orElseGet(Supplier)

Interface OptionalIntFunction<R>

Method Summary

Method Detail

apply

orElse

orElseGet