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package scala.collection.generic
/** A template for companion objects of Traversible and subclasses thereof.
*/
abstract class TraversibleFactory[CC[A] <: Traversible[A]] {
/** The builder for this kind of collection.
*/
def newBuilder[A]: Builder[A, CC[A], Any]
/** The empty iterable of type CC */
def empty[A]: CC[A] = newBuilder[A].result
/** Creates an iterable of type CC with specified elements */
def apply[A](args: A*): CC[A] = {
val b = newBuilder[A]
b ++= Iterable.fromOld(args)
b.result
}
/** Concatenate all the argument collections into a single collection.
*
* @param xss the collections that are to be concatenated
* @return the concatenation of all the collections
*/
def concat[A](xss: Traversible[A]*): CC[A] = {
val b = newBuilder[A]
for (xs <- xss) b ++= xs
b.result
}
/** An iterable that contains the results of some element computation a number of times.
* @param n the number of elements returned
* @param elem the element computation
*/
def fill[A](n: Int)(elem: => A): CC[A] = {
val b = newBuilder[A]
var i = 0
while (i < n) {
b += elem
i += 1
}
b.result
}
/** A two-dimensional iterable that contains the results of some element computation a number of times.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param elem the element computation
*/
def fill[A](n1: Int, n2: Int)(elem: => A): CC[CC[A]] =
tabulate(n1)(_ => fill(n2)(elem))
/** A three-dimensional iterable that contains the results of some element computation a number of times.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param elem the element computation
*/
def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): CC[CC[CC[A]]] =
tabulate(n1)(_ => fill(n2, n3)(elem))
/** A four-dimensional iterable that contains the results of some element computation a number of times.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param n4 the number of elements in the 4th dimension
* @param elem the element computation
*/
def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): CC[CC[CC[CC[A]]]] =
tabulate(n1)(_ => fill(n2, n3, n4)(elem))
/** A five-dimensional iterable that contains the results of some element computation a number of times.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param n4 the number of elements in the 4th dimension
* @param n5 the number of elements in the 5th dimension
* @param elem the element computation
*/
def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): CC[CC[CC[CC[CC[A]]]]] =
tabulate(n1)(_ => fill(n2, n3, n4, n5)(elem))
/** An iterable containing values of a given function over a range of integer values starting from 0.
* @param n The number of elements in the iterable
* @param f The function computing element values
* @return An iterable consisting of elements `f(0), ..., f(n -1)`
*/
def tabulate[A](n: Int)(f: Int => A): CC[A] = {
val b = newBuilder[A]
var i = 0
while (i < n) {
b += f(i)
i += 1
}
b.result
}
/** A two-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param f The function computing element values
*/
def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): CC[CC[A]] =
tabulate(n1)(i1 => tabulate(n2)(f(i1, _)))
/** A three-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param f The function computing element values
*/
def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): CC[CC[CC[A]]] =
tabulate(n1)(i1 => tabulate(n2, n3)(f(i1, _, _)))
/** A four-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param n4 the number of elements in the 4th dimension
* @param f The function computing element values
*/
def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): CC[CC[CC[CC[A]]]] =
tabulate(n1)(i1 => tabulate(n2, n3, n4)(f(i1, _, _, _)))
/** A five-dimensional iterable containing values of a given function over ranges of integer values starting from 0.
* @param n1 the number of elements in the 1st dimension
* @param n2 the number of elements in the 2nd dimension
* @param n3 the number of elements in the 3nd dimension
* @param n4 the number of elements in the 4th dimension
* @param n5 the number of elements in the 5th dimension
* @param f The function computing element values
*/
def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): CC[CC[CC[CC[CC[A]]]]] =
tabulate(n1)(i1 => tabulate(n2, n3, n4, n5)(f(i1, _, _, _, _)))
/** An iterable containing a sequence of increasing integers in a range.
*
* @param from the start value of the iterable
* @param end the end value of the iterable (the first value NOT returned)
* @return the iterable with values in range `start, start + 1, ..., end - 1`
* up to, but exclusding, `end`.
*/
def range[A](start: Int, end: Int): CC[Int] = range(start, end, 1)
/** An iterable containing equally spaced values in some integer interval.
* @param start the start value of the iterable
* @param end the end value of the iterable (the first value NOT returned)
* @param step the increment value of the iterable (must be positive or negative)
* @return the iterable with values in `start, start + step, ...` up to, but excluding `end`
*/
def range(start: Int, end: Int, step: Int): CC[Int] = {
if (step == 0) throw new IllegalArgumentException("zero step")
val b = newBuilder[Int]
var i = start
while (if (step < 0) end < i else i < end) {
b += i
i += step
}
b.result
}
/** An iterable containing repeated applications of a function to a start value.
*
* @param start the start value of the iterable
* @param len the number of elements returned by the iterable
* @param f the function that's repeatedly applied
* @return the iterable returning `len` values in the sequence `start, f(start), f(f(start)), ...`
*/
def iterate(start: Int, len: Int)(f: Int => Int): CC[Int] = {
val b = newBuilder[Int]
var acc = start
var i = 0
while (i < len) {
b += acc
acc = f(acc)
i += 1
}
b.result
}
}
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