trait HavingSize[T] extends AnyRef
This trait is mixed in to Generators that have a well-defined notion of "size".
Broadly speaking, this applies when T is a type that has a size
method. For
example, Generator.setGenerator (also known as CommonGenerators.sets) has the
HavingSize trait because Set has a size
method.
Generators with this trait provide several functions that allow you to create more-specialized Generators, with specific size bounds.
- T
the type that this Generator produces
- Source
- HavingSize.scala
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- abstract def havingSize(len: PosZInt): Generator[T]
Create a version of this Generator that produces values of exactly the specified size.
Create a version of this Generator that produces values of exactly the specified size.
For example, consider:
val stringSets: Generator[Set[String]] = Generator.setGenerator[String] val singleStringSets: Generator[Set[String]] = stringSets.havingSize(1)
The
singleStringSets
Generator will always produce Sets of exactly one String.- len
the size of the values to produce
- returns
a new Generator that produces values of that size
- abstract def havingSizesBetween(from: PosZInt, to: PosZInt): Generator[T]
Create a version of this Generator that produces values within the specified size range.
Create a version of this Generator that produces values within the specified size range.
The bounds are inclusive: the resulting Generator may produce values with a size of
to
orfrom
.For example, consider:
val stringSets: Generator[Set[String]] = Generator.setGenerator[String] val smallStringSets: Generator[Set[String]] = stringSets.havingSizesBetween(0, 3)
The
smallStringSets
Generator will always produce Sets of zero through three Strings.- from
The smallest desired size to produce
- to
The largest desired size to produce
- returns
a Generator that will only produce values within that size range
- abstract def havingSizesDeterminedBy(f: (SizeParam) => SizeParam): Generator[T]
Create a version of this Generator whose legal sizes are adjusted by a specified function.
Create a version of this Generator whose legal sizes are adjusted by a specified function.
For example:
def currentLimit: PosZInt = ... def limitedSize(szp: SizeParam): SizeParam = { val limit = currentLimit val sz = if (szp.maxSize < limit) szp.maxSize else limit szp.copy(size = sz) } val sizelimitedLists = lists[Int].havingSizesDeterminedBy(limitedSize)
This doesn't hard-code the size of the
sizeLimitedLists
Generator, but allows the maximum size to be clamped based on a dynamiccurrentLimit
function.
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