public abstract interface ToDoubleBiFunction<T, U>
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Represents a function that accepts two arguments and produces a double-valued result. This is the double-producing primitive specialization for BiFunction.

This is a functional interface whose functional method is applyAsDouble(Object, Object).

<T>    the type of the first argument to the function
<U>    the type of the second argument to the function

See also:

Since:  1.8