trait Collecting[E, C] extends AnyRef
Supertrait for typeclasses that enable loneElement
and inspectors syntax
for collections.
A Collecting[E, C]
provides access to the "collecting nature" of type C
in such
a way that loneElement
syntax can be used with type C
. A C
can be any type of "collecting", a type that in some way collects or brings together elements of type E
.
ScalaTest provides implicit implementations for several types. You can enable the contain
matcher syntax
on your own type U
by defining an Collecting[E, U]
for the type and making it available implicitly.
ScalaTest provides implicit Collecting
instances for scala.collection.GenTraversable
,
Array
, java.util.Collection
and java.util.Map
in the
Collecting
companion object.
- Source
- Collecting.scala
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Abstract Value Members
-
abstract
def
genTraversableFrom(collection: C): GenTraversable[E]
Returns a
GenTraversable[E]
containing the same elements (in the same order, if the original collection had a defined order), as the passedcollection
.Returns a
GenTraversable[E]
containing the same elements (in the same order, if the original collection had a defined order), as the passedcollection
.- collection
a
collection
to check the size of- returns
a
GenTraversable[E]
containing the same elements as the passedcollection
-
abstract
def
loneElementOf(collection: C): Option[E]
Implements the
loneElement
syntax of traitLoneElement
.Implements the
loneElement
syntax of traitLoneElement
.Returns the lone element contained in a collection, wrapped in a
Some
, orNone
if the collection contains either no elements or more than one element.- collection
a collection about which an assertion is being made
- returns
Some[E]
if the collection contains one and only one element,None
otherwise.
-
abstract
def
sizeOf(collection: C): Int
Returns the size of the passed
collection
.Returns the size of the passed
collection
.- collection
a
collection
to check the size of- returns
the size of the passed
collection
Concrete Value Members
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def
!=(arg0: Any): Boolean
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