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Standard library for the Scala Programming Language
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
import scala.language.implicitConversions
import scala.collection.{mutable, immutable, ArrayOps, StringOps}, immutable.WrappedString
import scala.annotation.{elidable, implicitNotFound}, elidable.ASSERTION
import scala.annotation.meta.{ companionClass, companionMethod }
/** The `Predef` object provides definitions that are accessible in all Scala
* compilation units without explicit qualification.
*
* === Commonly Used Types ===
* Predef provides type aliases for types which are commonly used, such as
* the immutable collection types [[scala.collection.immutable.Map]] and
* [[scala.collection.immutable.Set]].
*
* === Console Output ===
* For basic console output, `Predef` provides convenience methods [[print(x:Any* print]] and [[println(x:Any* println]],
* which are aliases of the methods in the object [[scala.Console]].
*
* === Assertions ===
* A set of `assert` functions are provided for use as a way to document
* and dynamically check invariants in code. Invocations of `assert` can be elided
* at compile time by providing the command line option `-Xdisable-assertions`,
* which raises `-Xelide-below` above `elidable.ASSERTION`, to the `scalac` command.
*
* Variants of `assert` intended for use with static analysis tools are also
* provided: `assume`, `require` and `ensuring`. `require` and `ensuring` are
* intended for use as a means of design-by-contract style specification
* of pre- and post-conditions on functions, with the intention that these
* specifications could be consumed by a static analysis tool. For instance,
*
* {{{
* def addNaturals(nats: List[Int]): Int = {
* require(nats forall (_ >= 0), "List contains negative numbers")
* nats.foldLeft(0)(_ + _)
* } ensuring(_ >= 0)
* }}}
*
* The declaration of `addNaturals` states that the list of integers passed should
* only contain natural numbers (i.e. non-negative), and that the result returned
* will also be natural. `require` is distinct from `assert` in that if the
* condition fails, then the caller of the function is to blame rather than a
* logical error having been made within `addNaturals` itself. `ensuring` is a
* form of `assert` that declares the guarantee the function is providing with
* regards to its return value.
*
* === Implicit Conversions ===
* A number of commonly applied implicit conversions are also defined here, and
* in the parent type [[scala.LowPriorityImplicits]]. Implicit conversions
* are provided for the "widening" of numeric values, for instance, converting a
* Short value to a Long value as required, and to add additional higher-order
* functions to Array values. These are described in more detail in the documentation of [[scala.Array]].
*
* @groupname utilities Utility Methods
* @groupprio utilities 10
*
* @groupname assertions Assertions
* @groupprio assertions 20
* @groupdesc assertions These methods support program verification and runtime correctness.
*
* @groupname console-output Console Output
* @groupprio console-output 30
* @groupdesc console-output These methods provide output via the console.
*
* @groupname aliases Aliases
* @groupprio aliases 50
* @groupdesc aliases These aliases bring selected immutable types into scope without any imports.
*
* @groupname conversions-string String Conversions
* @groupprio conversions-string 60
* @groupdesc conversions-string Conversions from String to StringOps or WrappedString.
*
* @groupname implicit-classes-any Implicit Classes
* @groupprio implicit-classes-any 70
* @groupdesc implicit-classes-any These implicit classes add useful extension methods to every type.
*
* @groupname char-sequence-wrappers CharSequence Wrappers
* @groupprio char-sequence-wrappers 80
* @groupdesc char-sequence-wrappers Wrappers that implements CharSequence and were implicit classes.
*
* @groupname conversions-java-to-anyval Java to Scala
* @groupprio conversions-java-to-anyval 90
* @groupdesc conversions-java-to-anyval Implicit conversion from Java primitive wrapper types to Scala equivalents.
*
* @groupname conversions-anyval-to-java Scala to Java
* @groupprio conversions-anyval-to-java 100
* @groupdesc conversions-anyval-to-java Implicit conversion from Scala AnyVals to Java primitive wrapper types equivalents.
*
* @groupname conversions-array-to-wrapped-array Array to ArraySeq
* @groupprio conversions-array-to-wrapped-array 110
* @groupdesc conversions-array-to-wrapped-array Conversions from Arrays to ArraySeqs.
*/
object Predef extends LowPriorityImplicits {
/**
* Retrieve the runtime representation of a class type. `classOf[T]` is equivalent to
* the class literal `T.class` in Java.
*
* @example {{{
* val listClass = classOf[List[_]]
* // listClass is java.lang.Class[List[_]] = class scala.collection.immutable.List
*
* val mapIntString = classOf[Map[Int,String]]
* // mapIntString is java.lang.Class[Map[Int,String]] = interface scala.collection.immutable.Map
* }}}
*
* @return The runtime [[Class]] representation of type `T`.
* @group utilities
*/
def classOf[T]: Class[T] = null // This is a stub method. The actual implementation is filled in by the compiler.
/**
* Retrieve the single value of a type with a unique inhabitant.
*
* @example {{{
* object Foo
* val foo = valueOf[Foo.type]
* // foo is Foo.type = Foo
*
* val bar = valueOf[23]
* // bar is 23.type = 23
* }}}
* @group utilities
*/
@inline def valueOf[T](implicit vt: ValueOf[T]): T = vt.value
/** The `String` type in Scala has all the methods of the underlying
* [[java.lang.String]], of which it is just an alias.
*
* In addition, extension methods in [[scala.collection.StringOps]]
* are added implicitly through the conversion [[augmentString]].
* @group aliases
*/
type String = java.lang.String
/** @group aliases */
type Class[T] = java.lang.Class[T]
// miscellaneous -----------------------------------------------------
scala.`package` // to force scala package object to be seen.
scala.collection.immutable.List // to force Nil, :: to be seen.
/** @group aliases */
type Function[-A, +B] = Function1[A, B]
/** @group aliases */
type Map[K, +V] = immutable.Map[K, V]
/** @group aliases */
type Set[A] = immutable.Set[A]
/** @group aliases */
val Map = immutable.Map
/** @group aliases */
val Set = immutable.Set
/**
* Allows destructuring tuples with the same syntax as constructing them.
*
* @example {{{
* val tup = "foobar" -> 3
*
* val c = tup match {
* case str -> i => str.charAt(i)
* }
* }}}
* @group aliases
*/
val -> = Tuple2
// Manifest types, companions, and incantations for summoning
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("this notion doesn't have a corresponding concept in 2.10, because scala.reflect.runtime.universe.TypeTag can capture arbitrary types. Use type tags instead of manifests, and there will be no need in opt manifests.", "2.10.0")
type OptManifest[T] = scala.reflect.OptManifest[T]
@implicitNotFound(msg = "No Manifest available for ${T}.")
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("use `scala.reflect.ClassTag` (to capture erasures) or scala.reflect.runtime.universe.TypeTag (to capture types) or both instead", "2.10.0")
type Manifest[T] = scala.reflect.Manifest[T]
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("use `scala.reflect.ClassTag` (to capture erasures) or scala.reflect.runtime.universe.TypeTag (to capture types) or both instead", "2.10.0")
val Manifest = scala.reflect.Manifest
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("this notion doesn't have a corresponding concept in 2.10, because scala.reflect.runtime.universe.TypeTag can capture arbitrary types. Use type tags instead of manifests, and there will be no need in opt manifests.", "2.10.0")
val NoManifest = scala.reflect.NoManifest
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("use scala.reflect.classTag[T] and scala.reflect.runtime.universe.typeTag[T] instead", "2.10.0")
def manifest[T](implicit m: Manifest[T]): Manifest[T] = m
// TODO undeprecated until Scala reflection becomes non-experimental
// @deprecated("this notion doesn't have a corresponding concept in 2.10, because scala.reflect.runtime.universe.TypeTag can capture arbitrary types. Use type tags instead of manifests, and there will be no need in opt manifests.", "2.10.0")
def optManifest[T](implicit m: OptManifest[T]): OptManifest[T] = m
// Minor variations on identity functions
/**
* A method that returns its input value.
* @tparam A type of the input value x.
* @param x the value of type `A` to be returned.
* @return the value `x`.
* @group utilities */
@inline def identity[A](x: A): A = x // see `$conforms` for the implicit version
/** Summon an implicit value of type `T`. Usually, the argument is not passed explicitly.
*
* @tparam T the type of the value to be summoned
* @return the implicit value of type `T`
* @group utilities
*/
@inline def implicitly[T](implicit e: T): T = e // TODO: when dependent method types are on by default, give this result type `e.type`, so that inliner has better chance of knowing which method to inline in calls like `implicitly[MatchingStrategy[Option]].zero`
/** Used to mark code blocks as being expressions, instead of being taken as part of anonymous classes and the like.
* This is just a different name for [[identity]].
*
* @example Separating code blocks from `new`:
* {{{
* val x = new AnyRef
* {
* val y = ...
* println(y)
* }
* // the { ... } block is seen as the body of an anonymous class
*
* val x = new AnyRef
*
* {
* val y = ...
* println(y)
* }
* // an empty line is a brittle "fix"
*
* val x = new AnyRef
* locally {
* val y = ...
* println(y)
* }
* // locally guards the block and helps communicate intent
* }}}
* @group utilities
*/
@inline def locally[T](@deprecatedName("x") x: T): T = x
// assertions ---------------------------------------------------------
/** Tests an expression, throwing an `AssertionError` if false.
* Calls to this method will not be generated if `-Xelide-below`
* is greater than `ASSERTION`.
*
* @see [[scala.annotation.elidable elidable]]
* @param assertion the expression to test
* @group assertions
*/
@elidable(ASSERTION)
def assert(assertion: Boolean): Unit = {
if (!assertion)
throw new java.lang.AssertionError("assertion failed")
}
/** Tests an expression, throwing an `AssertionError` if false.
* Calls to this method will not be generated if `-Xelide-below`
* is greater than `ASSERTION`.
*
* @see [[scala.annotation.elidable elidable]]
* @param assertion the expression to test
* @param message a String to include in the failure message
* @group assertions
*/
@elidable(ASSERTION) @inline
final def assert(assertion: Boolean, message: => Any): Unit = {
if (!assertion)
throw new java.lang.AssertionError("assertion failed: "+ message)
}
/** Tests an expression, throwing an `AssertionError` if false.
* This method differs from assert only in the intent expressed:
* assert contains a predicate which needs to be proven, while
* assume contains an axiom for a static checker. Calls to this method
* will not be generated if `-Xelide-below` is greater than `ASSERTION`.
*
* @see [[scala.annotation.elidable elidable]]
* @param assumption the expression to test
* @group assertions
*/
@elidable(ASSERTION)
def assume(assumption: Boolean): Unit = {
if (!assumption)
throw new java.lang.AssertionError("assumption failed")
}
/** Tests an expression, throwing an `AssertionError` if false.
* This method differs from assert only in the intent expressed:
* assert contains a predicate which needs to be proven, while
* assume contains an axiom for a static checker. Calls to this method
* will not be generated if `-Xelide-below` is greater than `ASSERTION`.
*
* @see [[scala.annotation.elidable elidable]]
* @param assumption the expression to test
* @param message a String to include in the failure message
* @group assertions
*/
@elidable(ASSERTION) @inline
final def assume(assumption: Boolean, message: => Any): Unit = {
if (!assumption)
throw new java.lang.AssertionError("assumption failed: "+ message)
}
/** Tests an expression, throwing an `IllegalArgumentException` if false.
* This method is similar to `assert`, but blames the caller of the method
* for violating the condition.
*
* @param requirement the expression to test
* @group assertions
*/
def require(requirement: Boolean): Unit = {
if (!requirement)
throw new IllegalArgumentException("requirement failed")
}
/** Tests an expression, throwing an `IllegalArgumentException` if false.
* This method is similar to `assert`, but blames the caller of the method
* for violating the condition.
*
* @param requirement the expression to test
* @param message a String to include in the failure message
* @group assertions
*/
@inline final def require(requirement: Boolean, message: => Any): Unit = {
if (!requirement)
throw new IllegalArgumentException("requirement failed: "+ message)
}
/** `???` can be used for marking methods that remain to be implemented.
* @throws NotImplementedError when `???` is invoked.
* @group utilities
*/
def ??? : Nothing = throw new NotImplementedError
// implicit classes -----------------------------------------------------
/** @group implicit-classes-any */
implicit final class ArrowAssoc[A](private val self: A) extends AnyVal {
@inline def -> [B](y: B): (A, B) = (self, y)
@deprecated("Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.", "2.13.0")
def →[B](y: B): (A, B) = ->(y)
}
/** @group implicit-classes-any */
implicit final class Ensuring[A](private val self: A) extends AnyVal {
def ensuring(cond: Boolean): A = { assert(cond); self }
def ensuring(cond: Boolean, msg: => Any): A = { assert(cond, msg); self }
def ensuring(cond: A => Boolean): A = { assert(cond(self)); self }
def ensuring(cond: A => Boolean, msg: => Any): A = { assert(cond(self), msg); self }
}
/** @group implicit-classes-any */
implicit final class StringFormat[A](private val self: A) extends AnyVal {
/** Returns string formatted according to given `format` string.
* Format strings are as for `String.format`
* (@see java.lang.String.format).
*/
@inline def formatted(fmtstr: String): String = fmtstr format self
}
/** Injects String concatenation operator `+` to any classes.
* @group implicit-classes-any
*/
@(deprecated @companionMethod)("Implicit injection of + is deprecated. Convert to String to call +", "2.13.0")
@(deprecated @companionClass)("Implicit injection of + is deprecated. Convert to String to call +", "2.13.0") // for Scaladoc
// scala/bug#8229 retaining the pre 2.11 name for source compatibility in shadowing this implicit
implicit final class any2stringadd[A](private val self: A) extends AnyVal {
def +(other: String): String = String.valueOf(self) + other
}
/** @group char-sequence-wrappers */
final class SeqCharSequence(sequenceOfChars: scala.collection.IndexedSeq[Char]) extends CharSequence {
def length: Int = sequenceOfChars.length
def charAt(index: Int): Char = sequenceOfChars(index)
def subSequence(start: Int, end: Int): CharSequence = new SeqCharSequence(sequenceOfChars.slice(start, end))
override def toString = sequenceOfChars.mkString
}
/** @group char-sequence-wrappers */
def SeqCharSequence(sequenceOfChars: scala.collection.IndexedSeq[Char]): SeqCharSequence = new SeqCharSequence(sequenceOfChars)
/** @group char-sequence-wrappers */
final class ArrayCharSequence(arrayOfChars: Array[Char]) extends CharSequence {
def length: Int = arrayOfChars.length
def charAt(index: Int): Char = arrayOfChars(index)
def subSequence(start: Int, end: Int): CharSequence = new runtime.ArrayCharSequence(arrayOfChars, start, end)
override def toString = arrayOfChars.mkString
}
/** @group char-sequence-wrappers */
def ArrayCharSequence(arrayOfChars: Array[Char]): ArrayCharSequence = new ArrayCharSequence(arrayOfChars)
/** @group conversions-string */
@inline implicit def augmentString(x: String): StringOps = new StringOps(x)
// printing -----------------------------------------------------------
/** Prints an object to `out` using its `toString` method.
*
* @param x the object to print; may be null.
* @group console-output
*/
def print(x: Any): Unit = Console.print(x)
/** Prints a newline character on the default output.
* @group console-output
*/
def println(): Unit = Console.println()
/** Prints out an object to the default output, followed by a newline character.
*
* @param x the object to print.
* @group console-output
*/
def println(x: Any): Unit = Console.println(x)
/** Prints its arguments as a formatted string to the default output,
* based on a string pattern (in a fashion similar to printf in C).
*
* The interpretation of the formatting patterns is described in
* [[java.util.Formatter]].
*
* Consider using the [[scala.StringContext.f f interpolator]] as more type safe and idiomatic.
*
* @param text the pattern for formatting the arguments.
* @param xs the arguments used to instantiate the pattern.
* @throws java.lang.IllegalArgumentException if there was a problem with the format string or arguments
*
* @see [[scala.StringContext.f StringContext.f]]
* @group console-output
*/
def printf(text: String, xs: Any*): Unit = Console.print(text.format(xs: _*))
// views --------------------------------------------------------------
// these two are morally deprecated but the @deprecated annotation has been moved to the extension method themselves,
// in order to provide a more specific deprecation method.
implicit def tuple2ToZippedOps[T1, T2](x: (T1, T2)): runtime.Tuple2Zipped.Ops[T1, T2] = new runtime.Tuple2Zipped.Ops(x)
implicit def tuple3ToZippedOps[T1, T2, T3](x: (T1, T2, T3)): runtime.Tuple3Zipped.Ops[T1, T2, T3] = new runtime.Tuple3Zipped.Ops(x)
// Not specialized anymore since 2.13 but we still need separate methods
// to avoid https://github.com/scala/bug/issues/10746
// TODO: should not need @inline. add heuristic to inline factories for value classes.
@inline implicit def genericArrayOps[T](xs: Array[T]): ArrayOps[T] = new ArrayOps(xs)
@inline implicit def booleanArrayOps(xs: Array[Boolean]): ArrayOps[Boolean] = new ArrayOps(xs)
@inline implicit def byteArrayOps(xs: Array[Byte]): ArrayOps[Byte] = new ArrayOps(xs)
@inline implicit def charArrayOps(xs: Array[Char]): ArrayOps[Char] = new ArrayOps(xs)
@inline implicit def doubleArrayOps(xs: Array[Double]): ArrayOps[Double] = new ArrayOps(xs)
@inline implicit def floatArrayOps(xs: Array[Float]): ArrayOps[Float] = new ArrayOps(xs)
@inline implicit def intArrayOps(xs: Array[Int]): ArrayOps[Int] = new ArrayOps(xs)
@inline implicit def longArrayOps(xs: Array[Long]): ArrayOps[Long] = new ArrayOps(xs)
@inline implicit def refArrayOps[T <: AnyRef](xs: Array[T]): ArrayOps[T] = new ArrayOps(xs)
@inline implicit def shortArrayOps(xs: Array[Short]): ArrayOps[Short] = new ArrayOps(xs)
@inline implicit def unitArrayOps(xs: Array[Unit]): ArrayOps[Unit] = new ArrayOps(xs)
// "Autoboxing" and "Autounboxing" ---------------------------------------------------
/** @group conversions-anyval-to-java */
implicit def byte2Byte(x: Byte): java.lang.Byte = x.asInstanceOf[java.lang.Byte]
/** @group conversions-anyval-to-java */
implicit def short2Short(x: Short): java.lang.Short = x.asInstanceOf[java.lang.Short]
/** @group conversions-anyval-to-java */
implicit def char2Character(x: Char): java.lang.Character = x.asInstanceOf[java.lang.Character]
/** @group conversions-anyval-to-java */
implicit def int2Integer(x: Int): java.lang.Integer = x.asInstanceOf[java.lang.Integer]
/** @group conversions-anyval-to-java */
implicit def long2Long(x: Long): java.lang.Long = x.asInstanceOf[java.lang.Long]
/** @group conversions-anyval-to-java */
implicit def float2Float(x: Float): java.lang.Float = x.asInstanceOf[java.lang.Float]
/** @group conversions-anyval-to-java */
implicit def double2Double(x: Double): java.lang.Double = x.asInstanceOf[java.lang.Double]
/** @group conversions-anyval-to-java */
implicit def boolean2Boolean(x: Boolean): java.lang.Boolean = x.asInstanceOf[java.lang.Boolean]
/** @group conversions-java-to-anyval */
implicit def Byte2byte(x: java.lang.Byte): Byte = x.asInstanceOf[Byte]
/** @group conversions-java-to-anyval */
implicit def Short2short(x: java.lang.Short): Short = x.asInstanceOf[Short]
/** @group conversions-java-to-anyval */
implicit def Character2char(x: java.lang.Character): Char = x.asInstanceOf[Char]
/** @group conversions-java-to-anyval */
implicit def Integer2int(x: java.lang.Integer): Int = x.asInstanceOf[Int]
/** @group conversions-java-to-anyval */
implicit def Long2long(x: java.lang.Long): Long = x.asInstanceOf[Long]
/** @group conversions-java-to-anyval */
implicit def Float2float(x: java.lang.Float): Float = x.asInstanceOf[Float]
/** @group conversions-java-to-anyval */
implicit def Double2double(x: java.lang.Double): Double = x.asInstanceOf[Double]
/** @group conversions-java-to-anyval */
implicit def Boolean2boolean(x: java.lang.Boolean): Boolean = x.asInstanceOf[Boolean]
/** An implicit of type `A => A` is available for all `A` because it can always
* be implemented using the identity function. This also means that an
* implicit of type `A => B` is always available when `A <: B`, because
* `(A => A) <: (A => B)`.
*/
// $ to avoid accidental shadowing (e.g. scala/bug#7788)
implicit def $conforms[A]: A => A = <:<.refl
}
/** The `LowPriorityImplicits` class provides implicit values that
* are valid in all Scala compilation units without explicit qualification,
* but that are partially overridden by higher-priority conversions in object
* `Predef`.
*/
// scala/bug#7335 Parents of Predef are defined in the same compilation unit to avoid
// cyclic reference errors compiling the standard library *without* a previously
// compiled copy on the classpath.
private[scala] abstract class LowPriorityImplicits extends LowPriorityImplicits2 {
import mutable.ArraySeq
/** We prefer the java.lang.* boxed types to these wrappers in
* any potential conflicts. Conflicts do exist because the wrappers
* need to implement ScalaNumber in order to have a symmetric equals
* method, but that implies implementing java.lang.Number as well.
*
* Note - these are inlined because they are value classes, but
* the call to xxxWrapper is not eliminated even though it does nothing.
* Even inlined, every call site does a no-op retrieval of Predef's MODULE$
* because maybe loading Predef has side effects!
*/
@inline implicit def byteWrapper(x: Byte): runtime.RichByte = new runtime.RichByte(x)
@inline implicit def shortWrapper(x: Short): runtime.RichShort = new runtime.RichShort(x)
@inline implicit def intWrapper(x: Int): runtime.RichInt = new runtime.RichInt(x)
@inline implicit def charWrapper(c: Char): runtime.RichChar = new runtime.RichChar(c)
@inline implicit def longWrapper(x: Long): runtime.RichLong = new runtime.RichLong(x)
@inline implicit def floatWrapper(x: Float): runtime.RichFloat = new runtime.RichFloat(x)
@inline implicit def doubleWrapper(x: Double): runtime.RichDouble = new runtime.RichDouble(x)
@inline implicit def booleanWrapper(x: Boolean): runtime.RichBoolean = new runtime.RichBoolean(x)
/** @group conversions-array-to-wrapped-array */
implicit def genericWrapArray[T](xs: Array[T]): ArraySeq[T] =
if (xs eq null) null
else ArraySeq.make(xs)
// Since the JVM thinks arrays are covariant, one 0-length Array[AnyRef]
// is as good as another for all T <: AnyRef. Instead of creating 100,000,000
// unique ones by way of this implicit, let's share one.
/** @group conversions-array-to-wrapped-array */
implicit def wrapRefArray[T <: AnyRef](xs: Array[T]): ArraySeq.ofRef[T] = {
if (xs eq null) null
else if (xs.length == 0) ArraySeq.empty[AnyRef].asInstanceOf[ArraySeq.ofRef[T]]
else new ArraySeq.ofRef[T](xs)
}
/** @group conversions-array-to-wrapped-array */
implicit def wrapIntArray(xs: Array[Int]): ArraySeq.ofInt = if (xs ne null) new ArraySeq.ofInt(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapDoubleArray(xs: Array[Double]): ArraySeq.ofDouble = if (xs ne null) new ArraySeq.ofDouble(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapLongArray(xs: Array[Long]): ArraySeq.ofLong = if (xs ne null) new ArraySeq.ofLong(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapFloatArray(xs: Array[Float]): ArraySeq.ofFloat = if (xs ne null) new ArraySeq.ofFloat(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapCharArray(xs: Array[Char]): ArraySeq.ofChar = if (xs ne null) new ArraySeq.ofChar(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapByteArray(xs: Array[Byte]): ArraySeq.ofByte = if (xs ne null) new ArraySeq.ofByte(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapShortArray(xs: Array[Short]): ArraySeq.ofShort = if (xs ne null) new ArraySeq.ofShort(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapBooleanArray(xs: Array[Boolean]): ArraySeq.ofBoolean = if (xs ne null) new ArraySeq.ofBoolean(xs) else null
/** @group conversions-array-to-wrapped-array */
implicit def wrapUnitArray(xs: Array[Unit]): ArraySeq.ofUnit = if (xs ne null) new ArraySeq.ofUnit(xs) else null
/** @group conversions-string */
implicit def wrapString(s: String): WrappedString = if (s ne null) new WrappedString(s) else null
}
private[scala] abstract class LowPriorityImplicits2 {
@deprecated("Implicit conversions from Array to immutable.IndexedSeq are implemented by copying; Use the more efficient non-copying ArraySeq.unsafeWrapArray or an explicit toIndexedSeq call", "2.13.0")
implicit def copyArrayToImmutableIndexedSeq[T](xs: Array[T]): IndexedSeq[T] =
if (xs eq null) null
else new ArrayOps(xs).toIndexedSeq
}