All Superinterfaces:

LongFunction<OptionalDouble>

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 OptionalLongToDoubleFunction
extends LongFunction<OptionalDouble>
```
Variation of LongToDoubleFunction that returns OptionalDouble instead of the raw value. OptionalLongToDoubleFunction is typically obtained from ExceptionHandler.fromLongToDoubleFunction(LongToDoubleFunction), in which case its return value is empty when the underlying LongToDoubleFunction throws an exception. See noexception tutorial.

See Also:

ExceptionHandler.fromLongToDoubleFunction(LongToDoubleFunction), LongToDoubleFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`OptionalDouble`	`apply(long value)` Variation of `LongToDoubleFunction.applyAsDouble(long)` that returns `OptionalDouble`.
`default LongToDoubleFunction`	`orElse(double result)` Convert this `OptionalLongToDoubleFunction` to plain `LongToDoubleFunction` using default value.
`default LongToDoubleFunction`	`orElseGet(DoubleSupplier source)` Convert this `OptionalLongToDoubleFunction` to plain `LongToDoubleFunction` using fallback `DoubleSupplier`.

- Method Detail
  - apply
```
OptionalDouble apply(long value)
```
    Variation of LongToDoubleFunction.applyAsDouble(long) that returns OptionalDouble. If this OptionalLongToDoubleFunction is obtained from ExceptionHandler.fromLongToDoubleFunction(LongToDoubleFunction), the OptionalDouble will be empty only if the underlying LongToDoubleFunction throws. Otherwise the returned OptionalDouble just wraps the return value of underlying LongToDoubleFunction.
    
    Specified by:
    
    apply in interface LongFunction<OptionalDouble>
    
    Parameters:
    
    value - see LongToDoubleFunction.applyAsDouble(long)
    
    Returns:
    
    OptionalDouble typically wrapping return value of LongToDoubleFunction.applyAsDouble(long), or an empty OptionalDouble (typically signifying an exception)
    
    See Also:
    
    ExceptionHandler.fromLongToDoubleFunction(LongToDoubleFunction), LongToDoubleFunction.applyAsDouble(long)
  - orElse
```
default LongToDoubleFunction orElse(double result)
```
    Convert this OptionalLongToDoubleFunction to plain LongToDoubleFunction using default value. The returned LongToDoubleFunction will unwrap present value from the OptionalDouble if possible, or return result if the OptionalDouble is empty.
    
    Parameters:
    
    result - default value to return instead of an empty OptionalDouble
    
    Returns:
    
    plain LongToDoubleFunction that either unwraps OptionalDouble or returns default value
    
    See Also:
    
    orElseGet(DoubleSupplier), OptionalDouble.orElse(double)
  - orElseGet
```
default LongToDoubleFunction orElseGet(DoubleSupplier source)
```
    Convert this OptionalLongToDoubleFunction to plain LongToDoubleFunction using fallback DoubleSupplier. The returned LongToDoubleFunction will unwrap present value from the OptionalDouble if possible, or fall back to calling source if the OptionalDouble is empty.
    
    Parameters:
    
    source - DoubleSupplier to query for fallback value when OptionalDouble is empty
    
    Returns:
    
    plain LongToDoubleFunction that either unwraps OptionalDouble or falls back to source
    
    See Also:
    
    orElse(double), OptionalDouble.orElseGet(DoubleSupplier)

Interface OptionalLongToDoubleFunction

Method Summary

Method Detail

apply

orElse

orElseGet