Type Parameters:

T - see ToDoubleBiFunction

U - see ToDoubleBiFunction

All Superinterfaces:

BiFunction<T,U,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 OptionalToDoubleBiFunction<T,U>
extends BiFunction<T,U,OptionalDouble>
```
Variation of ToDoubleBiFunction that returns OptionalDouble instead of the raw value. OptionalToDoubleBiFunction is typically obtained from ExceptionHandler.fromToDoubleBiFunction(ToDoubleBiFunction), in which case its return value is empty when the underlying ToDoubleBiFunction throws an exception. See noexception tutorial.

See Also:

ExceptionHandler.fromToDoubleBiFunction(ToDoubleBiFunction), ToDoubleBiFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`OptionalDouble`	`apply(T t, U u)`	Variation of `ToDoubleBiFunction.applyAsDouble(Object, Object)` that returns `OptionalDouble`.
`default ToDoubleBiFunction<T,U>`	`orElse(double result)`	Converts this `OptionalToDoubleBiFunction` to plain `ToDoubleBiFunction` using default value.
`default ToDoubleBiFunction<T,U>`	`orElseGet(DoubleSupplier source)`	Converts this `OptionalToDoubleBiFunction` to plain `ToDoubleBiFunction` using fallback `DoubleSupplier`.

Methods inherited from interface java.util.function.BiFunction
andThen

- Method Detail
  - apply
```
OptionalDouble apply(T t,
                     U u)
```
    Variation of ToDoubleBiFunction.applyAsDouble(Object, Object) that returns OptionalDouble. If this OptionalToDoubleBiFunction is obtained from ExceptionHandler.fromToDoubleBiFunction(ToDoubleBiFunction), the OptionalDouble will be empty only if the underlying ToDoubleBiFunction throws. Otherwise the returned OptionalDouble just wraps the return value of underlying ToDoubleBiFunction.
    
    Specified by:
    
    apply in interface BiFunction<T,U,OptionalDouble>
    
    Parameters:
    
    t - see ToDoubleBiFunction.applyAsDouble(Object, Object)
    
    u - see ToDoubleBiFunction.applyAsDouble(Object, Object)
    
    Returns:
    
    OptionalDouble typically wrapping return value of ToDoubleBiFunction.applyAsDouble(Object, Object), or an empty OptionalDouble (typically signifying an exception)
    
    See Also:
    
    ExceptionHandler.fromToDoubleBiFunction(ToDoubleBiFunction), ToDoubleBiFunction.applyAsDouble(Object, Object)
  - orElse
```
default ToDoubleBiFunction<T,U> orElse(double result)
```
    Converts this OptionalToDoubleBiFunction to plain ToDoubleBiFunction using default value. The returned ToDoubleBiFunction 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 ToDoubleBiFunction that either unwraps OptionalDouble or returns default value
    
    See Also:
    
    orElseGet(DoubleSupplier), OptionalDouble.orElse(double)
  - orElseGet
```
default ToDoubleBiFunction<T,U> orElseGet(DoubleSupplier source)
```
    Converts this OptionalToDoubleBiFunction to plain ToDoubleBiFunction using fallback DoubleSupplier. The returned ToDoubleBiFunction 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 ToDoubleBiFunction that either unwraps OptionalDouble or falls back to source
    
    See Also:
    
    orElse(double), OptionalDouble.orElseGet(DoubleSupplier)

Interface OptionalToDoubleBiFunction<T,​U>

Method Summary

Methods inherited from interface java.util.function.BiFunction

Method Detail

apply

orElse

orElseGet

Interface OptionalToDoubleBiFunction<T,U>