ByName

A type class for convert between by-name type and normal by-value type.

This ByName type class provide an extension method extract for ByName.=> types via implicit view, which can be import as follow:

import com.thoughtworks.feature.ByName.ops._

Author:

杨博 (Yang Bo) <[email protected]>

ByNameType: The by-name type

Source

ByName.scala

Note

When using this ByName type class, you should make sure the type parameter ByNameType is an abstract type, in case of Scala compiler bugs. You can use a trick similar to C++'s Pimpl Idiom to create opacity abstract types

import com.thoughtworks.feature.ByName.`=>`
trait OpacityTypes {
  type IntByName
  implicit def typeClass: ByName.Aux[IntByName, Int]
}
val opacityTypes: OpacityTypes = new OpacityTypes {
  type IntByName = `=>`[Int]
  override def typeClass = ByName[IntByName]
}
import opacityTypes._

Now IntByName is an abstract type with underlying => Int type.

Given a by-name parameter of the return value of getInt(),

val getInt = stubFunction[Int]
val boxedByName: IntByName = typeClass.make(getInt())

when getInt returns 42,

getInt.when.once returns 42

then the value of the the by-name parameter should be 42;

boxedByName.extract should be(42)

when getInt returns 144,

getInt.when.once returns 144

then the value of the the by-name parameter should be 144.

boxedByName.extract should be(144)

Linear Supertypes

Serializable, Serializable, AnyRef, Any

Type Hierarchy

Type Members

abstract type Value

Abstract Value Members

abstract def extract(byName: ByNameType): Value
abstract def make(byName: ⇒ Value): ByNameType

Creates a by-name parameter.

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

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

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

Implicit information
This member is added by an implicit conversion from ByName[ByNameType] to ArrowAssoc[ByName[ByNameType]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
def ensuring(cond: (ByName[ByNameType]) ⇒ Boolean, msg: ⇒ Any): ByName[ByNameType]

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

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

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

Implicit information
This member is added by an implicit conversion from ByName[ByNameType] to Ensuring[ByName[ByNameType]] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
def formatted(fmtstr: String): String

Implicit information
This member is added by an implicit conversion from ByName[ByNameType] to StringFormat[ByName[ByNameType]] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
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): (ByName[ByNameType], B)

Implicit information
This member is added by an implicit conversion from ByName[ByNameType] to ArrowAssoc[ByName[ByNameType]] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

Related Docs: object ByName | package feature

trait ByName[ByNameType] extends Serializable

Author:

Type Members

abstract type Value

Abstract Value Members

abstract def extract(byName: ByNameType): Value

abstract def make(byName: ⇒ Value): ByNameType

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

def +(other: String): String

def ->[B](y: B): (ByName[ByNameType], B)

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

def ensuring(cond: (ByName[ByNameType]) ⇒ Boolean, msg: ⇒ Any): ByName[ByNameType]

def ensuring(cond: (ByName[ByNameType]) ⇒ Boolean): ByName[ByNameType]

def ensuring(cond: Boolean, msg: ⇒ Any): ByName[ByNameType]

def ensuring(cond: Boolean): ByName[ByNameType]

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

def formatted(fmtstr: String): String

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

def →[B](y: B): (ByName[ByNameType], B)

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from ByName[ByNameType] to any2stringadd[ByName[ByNameType]]

Inherited by implicit conversion StringFormat from ByName[ByNameType] to StringFormat[ByName[ByNameType]]

Inherited by implicit conversion Ensuring from ByName[ByNameType] to Ensuring[ByName[ByNameType]]

Inherited by implicit conversion ArrowAssoc from ByName[ByNameType] to ArrowAssoc[ByName[ByNameType]]

Ungrouped