AbstractPartialFunction

abstract class AbstractPartialFunction[-T1, +R] extends (T1) ⇒ R with PartialFunction[T1, R]

AbstractPartialFunction reformulates all operations of its supertrait PartialFunction in terms of isDefinedAt and applyOrElse.

This allows more efficient implementations in many cases:

optimized orElse method supports chained orElse in linear time, and with no slow-down if the orElse part is not needed.
optimized lift method helps to avoid double evaluation of pattern matchers & guards of partial function literals.

This trait is used as a basis for implementation of all partial function literals.

Self Type: AbstractPartialFunction[T1, R]
Source: AbstractPartialFunction.scala
Since: 2.10

Linear Supertypes

PartialFunction[T1, R], (T1) ⇒ R, AnyRef, Any

Type Hierarchy

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Inherited

AbstractPartialFunction
PartialFunction
Function1
AnyRef
Any

Implicitly

by any2stringadd
by StringFormat
by Ensuring
by ArrowAssoc

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Visibility

Public
All

Instance Constructors

new AbstractPartialFunction()

Abstract Value Members

abstract def isDefinedAt(x: T1): Boolean
Checks if a value is contained in the function's domain.
Checks if a value is contained in the function's domain.
x
the value to test
returns
true, iff x is in the domain of this function, false otherwise.

Definition Classes
PartialFunction

Concrete Value Members

final def !=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
returns
true if !(this == that), false otherwise.

Definition Classes
AnyRef → Any
final def ##(): Int
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.
returns
a hash value consistent with ==

Definition Classes
AnyRef → Any
def +(other: String): String

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd
def ->[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
final def ==(arg0: Any): Boolean
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def andThen[C](k: (R) ⇒ C): PartialFunction[T1, C]
Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the same domain as this partial function, which maps arguments x to k(this(x)).

Definition Classes
PartialFunction → Function1
def apply(x: T1): R
Apply the body of this function to the argument.
Apply the body of this function to the argument.
returns
the result of function application.

Definition Classes
AbstractPartialFunction → Function1
def applyOrElse[A1 <: T1, B1 >: R](x: A1, default: (A1) ⇒ B1): B1
Applies this partial function to the given argument when it is contained in the function domain.
Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.
Note that expression pf.applyOrElse(x, default) is equivalent to
```
if(pf isDefinedAt x) pf(x) else default(x)
```
except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:
- combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
- lift and unlift do not evaluate source functions twice on each invocation
- runWith allows efficient imperative-style combining of partial functions with conditionally applied actions
For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.
x
the function argument
default
the fallback function
returns
the result of this function or fallback function application.

Definition Classes
PartialFunction
Since
2.10
final def asInstanceOf[T0]: T0
Cast the receiver object to be of type T0.
Cast the receiver object to be of type T0.
Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.
returns
the receiver object.

Definition Classes
Any
Exceptions thrown
ClassCastException if the receiver object is not an instance of the erasure of type T0.
def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
returns
a copy of the receiver object.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
Note
not specified by SLS as a member of AnyRef
def compose[A](g: (A) ⇒ T1): (A) ⇒ R
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
A
the type to which function g can be applied
g
a function A => T1
returns
a new function f such that f(x) == apply(g(x))

Definition Classes
Function1
Annotations
@unspecialized()
def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
final def eq(arg0: AnyRef): Boolean
Tests whether the argument (that) is a reference to the receiver object (this).
Tests whether the argument (that) is a reference to the receiver object (this).
The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:
- It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
- For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
- null.eq(null) returns true.
When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).
returns
true if the argument is a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
def equals(arg0: Any): Boolean
The equality method for reference types.
The equality method for reference types. Default implementation delegates to eq.
See also equals in scala.Any.
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
Note
not specified by SLS as a member of AnyRef
def formatted(fmtstr: String): String
Returns string formatted according to given format string.
Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()
final def getClass(): Class[_]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
returns
a class object corresponding to the runtime type of the receiver.

Definition Classes
AnyRef → Any
def hashCode(): Int
The hashCode method for reference types.
The hashCode method for reference types. See hashCode in scala.Any.
returns
the hash code value for this object.

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.

Definition Classes
Any
def lift: (T1) ⇒ Option[R]
Turns this partial function into a plain function returning an Option result.
Turns this partial function into a plain function returning an Option result.
returns
a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

Definition Classes
PartialFunction
See also
Function.unlift
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that).
Equivalent to !(this eq that).
returns
true if the argument is not a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
final def notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
final def notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
def orElse[A1 <: T1, B1 >: R](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
A1
the argument type of the fallback function
B1
the result type of the fallback function
that
the fallback function
returns
a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

Definition Classes
PartialFunction
def runWith[U](action: (R) ⇒ U): (T1) ⇒ Boolean
Composes this partial function with an action function which gets applied to results of this partial function.
Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.
Note that expression pf.runWith(action)(x) is equivalent to
```
if(pf isDefinedAt x) { action(pf(x)); true } else false
```
except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.
action
the action function
returns
a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

Definition Classes
PartialFunction
Since
2.10
See also
applyOrElse.
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
returns
a String representation of the object.

Definition Classes
Function1 → AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
def →[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

Inherited from PartialFunction[T1, R]

Value Members

abstract def isDefinedAt(x: T1): Boolean
Checks if a value is contained in the function's domain.
Checks if a value is contained in the function's domain.
x
the value to test
returns
true, iff x is in the domain of this function, false otherwise.

Definition Classes
PartialFunction
def andThen[C](k: (R) ⇒ C): PartialFunction[T1, C]
Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the same domain as this partial function, which maps arguments x to k(this(x)).

Definition Classes
PartialFunction → Function1
def applyOrElse[A1 <: T1, B1 >: R](x: A1, default: (A1) ⇒ B1): B1
Applies this partial function to the given argument when it is contained in the function domain.
Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.
Note that expression pf.applyOrElse(x, default) is equivalent to
```
if(pf isDefinedAt x) pf(x) else default(x)
```
except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:
- combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
- lift and unlift do not evaluate source functions twice on each invocation
- runWith allows efficient imperative-style combining of partial functions with conditionally applied actions
For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.
x
the function argument
default
the fallback function
returns
the result of this function or fallback function application.

Definition Classes
PartialFunction
Since
2.10
def lift: (T1) ⇒ Option[R]
Turns this partial function into a plain function returning an Option result.
Turns this partial function into a plain function returning an Option result.
returns
a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

Definition Classes
PartialFunction
See also
Function.unlift
def orElse[A1 <: T1, B1 >: R](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
A1
the argument type of the fallback function
B1
the result type of the fallback function
that
the fallback function
returns
a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

Definition Classes
PartialFunction
def runWith[U](action: (R) ⇒ U): (T1) ⇒ Boolean
Composes this partial function with an action function which gets applied to results of this partial function.
Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.
Note that expression pf.runWith(action)(x) is equivalent to
```
if(pf isDefinedAt x) { action(pf(x)); true } else false
```
except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.
action
the action function
returns
a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

Definition Classes
PartialFunction
Since
2.10
See also
applyOrElse.

Inherited from (T1) ⇒ R

Value Members

def compose[A](g: (A) ⇒ T1): (A) ⇒ R
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
A
the type to which function g can be applied
g
a function A => T1
returns
a new function f such that f(x) == apply(g(x))

Definition Classes
Function1
Annotations
@unspecialized()
def toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
returns
a String representation of the object.

Definition Classes
Function1 → AnyRef → Any

Inherited from AnyRef

Value Members

final def !=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
returns
true if !(this == that), false otherwise.

Definition Classes
AnyRef → Any
final def ##(): Int
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.
returns
a hash value consistent with ==

Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
returns
a copy of the receiver object.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
Note
not specified by SLS as a member of AnyRef
final def eq(arg0: AnyRef): Boolean
Tests whether the argument (that) is a reference to the receiver object (this).
Tests whether the argument (that) is a reference to the receiver object (this).
The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:
- It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
- For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
- null.eq(null) returns true.
When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).
returns
true if the argument is a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
def equals(arg0: Any): Boolean
The equality method for reference types.
The equality method for reference types. Default implementation delegates to eq.
See also equals in scala.Any.
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
Note
not specified by SLS as a member of AnyRef
final def getClass(): Class[_]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
returns
a class object corresponding to the runtime type of the receiver.

Definition Classes
AnyRef → Any
def hashCode(): Int
The hashCode method for reference types.
The hashCode method for reference types. See hashCode in scala.Any.
returns
the hash code value for this object.

Definition Classes
AnyRef → Any
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that).
Equivalent to !(this eq that).
returns
true if the argument is not a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
final def notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
final def notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Inherited from Any

Value Members

final def asInstanceOf[T0]: T0
Cast the receiver object to be of type T0.
Cast the receiver object to be of type T0.
Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.
returns
the receiver object.

Definition Classes
Any
Exceptions thrown
ClassCastException if the receiver object is not an instance of the erasure of type T0.
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.

Definition Classes
Any

Inherited by implicit conversion any2stringadd from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]]

Value Members

def +(other: String): String

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd

Inherited by implicit conversion StringFormat from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]]

Value Members

def formatted(fmtstr: String): String
Returns string formatted according to given format string.
Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()

Inherited by implicit conversion Ensuring from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]]

Value Members

def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring

Inherited by implicit conversion ArrowAssoc from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]]

Value Members

def ->[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
def →[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

Ungrouped

abstract def isDefinedAt(x: T1): Boolean
Checks if a value is contained in the function's domain.
Checks if a value is contained in the function's domain.
x
the value to test
returns
true, iff x is in the domain of this function, false otherwise.

Definition Classes
PartialFunction
final def !=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
returns
true if !(this == that), false otherwise.

Definition Classes
AnyRef → Any
final def ##(): Int
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.
returns
a hash value consistent with ==

Definition Classes
AnyRef → Any
def +(other: String): String

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd
def ->[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
final def ==(arg0: Any): Boolean
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def andThen[C](k: (R) ⇒ C): PartialFunction[T1, C]
Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
C
the result type of the transformation function.
k
the transformation function
returns
a partial function with the same domain as this partial function, which maps arguments x to k(this(x)).

Definition Classes
PartialFunction → Function1
def apply(x: T1): R
Apply the body of this function to the argument.
Apply the body of this function to the argument.
returns
the result of function application.

Definition Classes
AbstractPartialFunction → Function1
def applyOrElse[A1 <: T1, B1 >: R](x: A1, default: (A1) ⇒ B1): B1
Applies this partial function to the given argument when it is contained in the function domain.
Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.
Note that expression pf.applyOrElse(x, default) is equivalent to
```
if(pf isDefinedAt x) pf(x) else default(x)
```
except that applyOrElse method can be implemented more efficiently. For all partial function literals the compiler generates an applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:
- combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
- lift and unlift do not evaluate source functions twice on each invocation
- runWith allows efficient imperative-style combining of partial functions with conditionally applied actions
For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.
x
the function argument
default
the fallback function
returns
the result of this function or fallback function application.

Definition Classes
PartialFunction
Since
2.10
final def asInstanceOf[T0]: T0
Cast the receiver object to be of type T0.
Cast the receiver object to be of type T0.
Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.
returns
the receiver object.

Definition Classes
Any
Exceptions thrown
ClassCastException if the receiver object is not an instance of the erasure of type T0.
def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
returns
a copy of the receiver object.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
Note
not specified by SLS as a member of AnyRef
def compose[A](g: (A) ⇒ T1): (A) ⇒ R
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
A
the type to which function g can be applied
g
a function A => T1
returns
a new function f such that f(x) == apply(g(x))

Definition Classes
Function1
Annotations
@unspecialized()
def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (AbstractPartialFunction[T1, R]) ⇒ Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): AbstractPartialFunction[T1, R]

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
final def eq(arg0: AnyRef): Boolean
Tests whether the argument (that) is a reference to the receiver object (this).
Tests whether the argument (that) is a reference to the receiver object (this).
The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:
- It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
- For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
- null.eq(null) returns true.
When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).
returns
true if the argument is a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
def equals(arg0: Any): Boolean
The equality method for reference types.
The equality method for reference types. Default implementation delegates to eq.
See also equals in scala.Any.
returns
true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
AnyRef → Any
def finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
Note
not specified by SLS as a member of AnyRef
def formatted(fmtstr: String): String
Returns string formatted according to given format string.
Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()
final def getClass(): Class[_]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
returns
a class object corresponding to the runtime type of the receiver.

Definition Classes
AnyRef → Any
def hashCode(): Int
The hashCode method for reference types.
The hashCode method for reference types. See hashCode in scala.Any.
returns
the hash code value for this object.

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.

Definition Classes
Any
def lift: (T1) ⇒ Option[R]
Turns this partial function into a plain function returning an Option result.
Turns this partial function into a plain function returning an Option result.
returns
a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

Definition Classes
PartialFunction
See also
Function.unlift
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that).
Equivalent to !(this eq that).
returns
true if the argument is not a reference to the receiver object; false otherwise.

Definition Classes
AnyRef
final def notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
final def notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.

Definition Classes
AnyRef
Note
not specified by SLS as a member of AnyRef
def orElse[A1 <: T1, B1 >: R](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
A1
the argument type of the fallback function
B1
the result type of the fallback function
that
the fallback function
returns
a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

Definition Classes
PartialFunction
def runWith[U](action: (R) ⇒ U): (T1) ⇒ Boolean
Composes this partial function with an action function which gets applied to results of this partial function.
Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.
Note that expression pf.runWith(action)(x) is equivalent to
```
if(pf isDefinedAt x) { action(pf(x)); true } else false
```
except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.
action
the action function
returns
a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

Definition Classes
PartialFunction
Since
2.10
See also
applyOrElse.
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
returns
a String representation of the object.

Definition Classes
Function1 → AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
def →[B](y: B): (AbstractPartialFunction[T1, R], B)

Implicit
This member is added by an implicit conversion from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

Packages

Package structure

Automatic imports

AbstractPartialFunction

abstract class AbstractPartialFunction[-T1, +R] extends (T1) ⇒ R with PartialFunction[T1, R]

Instance Constructors

Abstract Value Members

Concrete Value Members

Inherited from PartialFunction[T1, R]

Value Members

Inherited from (T1) ⇒ R

Value Members

Inherited from AnyRef

Value Members

Inherited from Any

Value Members

Inherited by implicit conversion any2stringadd from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion StringFormat from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion Ensuring from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion ArrowAssoc from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]]

Value Members

Ungrouped

Packages

Package structure

Automatic imports

AbstractPartialFunction 

abstract class AbstractPartialFunction[-T1, +R] extends (T1) ⇒ R with PartialFunction[T1, R]

Instance Constructors

Abstract Value Members

Concrete Value Members

Inherited from PartialFunction[T1, R]

Value Members

Inherited from (T1) ⇒ R

Value Members

Inherited from AnyRef

Value Members

Inherited from Any

Value Members

Inherited by implicit conversion any2stringadd from AbstractPartialFunction[T1, R] to any2stringadd[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion StringFormat from AbstractPartialFunction[T1, R] to Predef.StringFormat[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion Ensuring from AbstractPartialFunction[T1, R] to Ensuring[AbstractPartialFunction[T1, R]]

Value Members

Inherited by implicit conversion ArrowAssoc from AbstractPartialFunction[T1, R] to ArrowAssoc[AbstractPartialFunction[T1, R]]

Value Members

Ungrouped

AbstractPartialFunction