/**
* Returns a composed {@link BiIntToFloatFunction} that first applies the {@code before} functions
* to its input, and then applies this function to the result. If evaluation of either operation
* throws an exception, it is relayed to the caller of the composed operation. This method is just
* convenience, to provide the ability to execute an operation which accepts {@code int} input,
* before this primitive function is executed.
*
* @param before1 The first function to apply before this function is applied
* @param before2 The second function to apply before this function is applied
* @return A composed {@code BiIntToFloatFunction} that first applies the {@code before} functions
* to its input, and then applies this function to the result.
* @throws NullPointerException If given argument is {@code null}
* @implSpec The input argument of this method is a able to handle primitive values. In this case
* this is {@code int}.
*/
@Nonnull
default BiIntToFloatFunction composeFromInt(
@Nonnull final IntFunction<? extends T> before1, @Nonnull final IntToDoubleFunction before2) {
Objects.requireNonNull(before1);
Objects.requireNonNull(before2);
return (value1, value2) -> applyAsFloat(before1.apply(value1), before2.applyAsDouble(value2));
}
public static <T> T[] apply(Class<T> type, int count, IntFunction<T> generator) {
T[] array = (T[]) Array.newInstance(type, count);
for (int i = 0; i < count; i++) {
array[i] = generator.apply(i);
}
return array;
}
/**
* Returns a composed {@link BiIntPredicate} that first applies the {@code before} functions to
* its input, and then applies this predicate to the result. If evaluation of either operation
* throws an exception, it is relayed to the caller of the composed operation. This method is just
* convenience, to provide the ability to execute an operation which accepts {@code int} input,
* before this primitive predicate is executed.
*
* @param before1 The first function to apply before this predicate is applied
* @param before2 The second function to apply before this predicate is applied
* @return A composed {@code BiIntPredicate} that first applies the {@code before} functions to
* its input, and then applies this predicate to the result.
* @throws NullPointerException If given argument is {@code null}
* @implSpec The input argument of this method is a able to handle primitive values. In this case
* this is {@code int}.
*/
@Nonnull
default BiIntPredicate composeFromInt(
@Nonnull final IntFunction<? extends T> before1, @Nonnull final IntToCharFunction before2) {
Objects.requireNonNull(before1);
Objects.requireNonNull(before2);
return (value1, value2) -> test(before1.apply(value1), before2.applyAsChar(value2));
}
private static long timer(int n, IntFunction<Long> aMethod) {
long startTime = System.nanoTime();
long returnLong = aMethod.apply(n);
long duration = System.nanoTime() - startTime;
System.out.print("Elapsed duration: " + duration + " (ns). Result = ");
return returnLong;
}
/**
* Returns a composed {@link TriIntConsumer} that first applies the {@code before} functions to
* its input, and then applies this consumer to the result. If evaluation of either operation
* throws an exception, it is relayed to the caller of the composed operation. This method is just
* convenience, to provide the ability to execute an operation which accepts {@code int} input,
* before this primitive consumer is executed.
*
* @param before1 The first function to apply before this consumer is applied
* @param before2 The second operator to apply before this consumer is applied
* @param before3 The third operator to apply before this consumer is applied
* @return A composed {@code TriIntConsumer} that first applies the {@code before} functions to
* its input, and then applies this consumer to the result.
* @throws NullPointerException If given argument is {@code null}
* @implSpec The input argument of this method is a able to handle primitive values. In this case
* this is {@code int}.
*/
@Nonnull
default TriIntConsumer composeFromInt(
@Nonnull final IntFunction<? extends T> before1,
@Nonnull final IntUnaryOperator before2,
@Nonnull final IntUnaryOperator before3) {
Objects.requireNonNull(before1);
Objects.requireNonNull(before2);
Objects.requireNonNull(before3);
return (value1, value2, value3) ->
accept(before1.apply(value1), before2.applyAsInt(value2), before3.applyAsInt(value3));
}
/**
* Returns a composed {@link TriIntToCharFunction} that first applies the {@code before} functions
* to its input, and then applies this function to the result. If evaluation of either operation
* throws an exception, it is relayed to the caller of the composed operation. This method is just
* convenience, to provide the ability to execute an operation which accepts {@code int} input,
* before this primitive function is executed.
*
* @param before1 The first function to apply before this function is applied
* @param before2 The second function to apply before this function is applied
* @param before3 The third function to apply before this function is applied
* @return A composed {@code TriIntToCharFunction} that first applies the {@code before} functions
* to its input, and then applies this function to the result.
* @throws NullPointerException If given argument is {@code null}
* @implSpec The input argument of this method is a able to handle primitive values. In this case
* this is {@code int}.
*/
@Nonnull
default TriIntToCharFunction composeFromInt(
@Nonnull final IntFunction<? extends T> before1,
@Nonnull final IntToByteFunction before2,
@Nonnull final IntToByteFunction before3) {
Objects.requireNonNull(before1);
Objects.requireNonNull(before2);
Objects.requireNonNull(before3);
return (value1, value2, value3) ->
applyAsChar(
before1.apply(value1), before2.applyAsByte(value2), before3.applyAsByte(value3));
}
private <E extends RuntimeException> void assertIntFunction(
IntFunction<Object> test, Class<E> type) {
assertNotNull(test);
try {
test.apply(0);
fail();
} catch (RuntimeException e) {
assertException(type, e, "0");
}
try {
IntStream.of(1, 2, 3).mapToObj(test);
} catch (RuntimeException e) {
assertException(type, e, "1");
}
}
public static <E, C extends Collection<E>> ArrayBuilderFactory<E, C> collection(
IntFunction<C> collectionFactory) {
return length -> {
C collection = collectionFactory.apply(length);
return new ArrayBuilderFactory.Builder<E, C>() {
@Override
public void add(@Nullable E element) {
collection.add(element);
}
@Override
public C build() {
return collection;
}
};
};
}
public static <E> ArrayBuilderFactory<E, E[]> array(IntFunction<E[]> arrayFactory) {
return length -> {
E[] array = arrayFactory.apply(length);
return new ArrayBuilderFactory.Builder<E, E[]>() {
private int i = 0;
@Override
public void add(@Nullable E element) {
array[i++] = element;
}
@Override
public E[] build() {
return array;
}
};
};
}
/**
* Obtains an instance with entries filled using a function.
*
* <p>The function is passed the row index, returning the column values.
*
* @param rows the number of rows
* @param columns the number of columns
* @param valuesFunction the function used to populate the values
* @return a matrix initialized using the function
*/
public static DoubleMatrix ofArrays(int rows, int columns, IntFunction<double[]> valuesFunction) {
if (rows == 0 || columns == 0) {
return EMPTY;
}
double[][] array = new double[rows][columns];
for (int i = 0; i < array.length; i++) {
double[] values = valuesFunction.apply(i);
if (values.length != columns) {
throw new IllegalArgumentException(
Messages.format(
"Function returned array of incorrect length {}, expected {}",
values.length,
columns));
}
array[i] = values.clone();
}
return new DoubleMatrix(array, rows, columns);
}
