trait ByName[ByNameType] extends Serializable
A type class for convert between by-name type and normal by-value type.
Installation
libraryDependencies += "com.thoughtworks.feature" %% "byname" % "latest.release"
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 typesimport 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 ofgetInt()
,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)
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- 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]
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- def →[B](y: B): (ByName[ByNameType], B)