Type Parameters:

T - see ToLongBiFunction

U - see ToLongBiFunction

All Superinterfaces:

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

See Also:

ExceptionHandler.fromToLongBiFunction(ToLongBiFunction), ToLongBiFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`OptionalLong`	`apply(T t, U u)`	Variation of `ToLongBiFunction.applyAsLong(Object, Object)` that returns `OptionalLong`.
`default ToLongBiFunction<T,U>`	`orElse(long result)`	Converts this `OptionalToLongBiFunction` to plain `ToLongBiFunction` using default value.
`default ToLongBiFunction<T,U>`	`orElseGet(LongSupplier source)`	Converts this `OptionalToLongBiFunction` to plain `ToLongBiFunction` using fallback `LongSupplier`.

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

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

Interface OptionalToLongBiFunction<T,​U>

Method Summary

Methods inherited from interface java.util.function.BiFunction

Method Detail

apply

orElse

orElseGet

Interface OptionalToLongBiFunction<T,U>