All Superinterfaces:

DoubleFunction<OptionalLong>

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 OptionalDoubleToLongFunction
extends DoubleFunction<OptionalLong>
```
Variation of DoubleToLongFunction that returns OptionalLong instead of the raw value. OptionalDoubleToLongFunction is typically obtained from ExceptionHandler.fromDoubleToLongFunction(DoubleToLongFunction), in which case its return value is empty when the underlying DoubleToLongFunction throws an exception. See noexception tutorial.

See Also:

ExceptionHandler.fromDoubleToLongFunction(DoubleToLongFunction), DoubleToLongFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`OptionalLong`	`apply(double value)` Variation of `DoubleToLongFunction.applyAsLong(double)` that returns `OptionalLong`.
`default DoubleToLongFunction`	`orElse(long result)` Convert this `OptionalDoubleToLongFunction` to plain `DoubleToLongFunction` using default value.
`default DoubleToLongFunction`	`orElseGet(LongSupplier source)` Convert this `OptionalDoubleToLongFunction` to plain `DoubleToLongFunction` using fallback `LongSupplier`.

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

Interface OptionalDoubleToLongFunction

Method Summary

Method Detail

apply

orElse

orElseGet