# Interface Functions.FailableFunction<I, R, T extends Throwable>

Type Parameters:
  `I` - Input type 1.
  `R` - Return type.
  `T` - Thrown exception.

Enclosing class:
  `Functions`

Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@Deprecated @FunctionalInterface public static interface Functions.FailableFunction<I, R, T extends Throwable>
Deprecated.
Use `FailableFunction`.
A functional interface like `Function` that declares a `Throwable`.

TODO for 4.0: Move to org.apache.commons.lang3.function.

Since:
  3.9

- ## Method Summary

  Modifier and Type
  Method
  Description
  `R`
  `apply(I input)`
  Deprecated.
  Applies this function.

- ## Method Details

  - ### apply

    R apply(I input) throws T
    Deprecated.
    Applies this function.
    Parameters:
      `input` - the input for the function
    Returns:
      the result of the function
    Throws:
      `T` - Thrown when the function fails.