functions.FunctionUsage Class Reference

Show the basic usage of Function objects. More...

Classes
class	IntegerDivision
	A function that computes integer division.

Static Public Member Functions
static void	main (String[] args)

Detailed Description

Show the basic usage of Function objects.

Sylvain Hallé Easy

Definition at line 35 of file FunctionUsage.java.

Member Function Documentation

main()

static void functions.FunctionUsage.main ( String []  args )

static

We create an instance of the negation function. The class

Definition at line 37 of file FunctionUsage.java.

    {
        /// We create an instance of the negation function. The class
        // Booleans contains a static reference to an instance of that function
        Function negation = Booleans.not;

        // To hold the return value of a function, we must give it an array
        Object[] out = new Object[1];

        // Let us evaluate the negation of a Boolean value. This is done
        // by calling evaluate on the function object.
        negation.evaluate(new Object[]{true}, out);

        // We print the return value of the function
        System.out.println("The return value of the function is: " + out[0]);
        ///

        //* Let us now try the same thing with a function that takes
        // two arguments.
        Function addition = Numbers.addition;

        // Since addition takes two arguments, we must pass it an array of
        // two objects
        addition.evaluate(new Object[]{2, 3}, out);

        // We print the return value of the function
        System.out.println("The return value of the function is: " + out[0]);
        //*
        
        //# Finally, a function does not necessarily have an output arity of 1.
        // In this example, we call a function that has both an input and an
        // output arity of 2. From two numbers x and y, it outputs the
        // quotient and the remainder of the division of x by y.
        Function int_division = IntegerDivision.instance;
        Object[] outs = new Object[2];
        int_division.evaluate(new Object[]{14, 3}, outs);
        System.out.println("14 divided by 3 equals " +
                outs[0] + " remainder " + outs[1]);
        //#
    }

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The documentation for this class was generated from the following file:

• Source/src/functions/FunctionUsage.java