GrowableBuilder (original) (raw)
scala.collection.mutable.GrowableBuilder
The canonical builder for collections that are growable, i.e. that support an efficient += method which adds an element to the collection.
GrowableBuilders can produce only a single instance of the collection they are growing.
Attributes
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Adds all elements produced by an IterableOnce to this growing builder.
Adds all elements produced by an IterableOnce to this growing builder.
Value parameters
elems
the IterableOnce producing the elements to add.
Attributes
Returns
the growing builder itself.
Definition Classes
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Adds a single element to this growing builder.
Adds a single element to this growing builder.
Value parameters
elem
the element to add.
Attributes
Returns
the growing builder itself
Source
Clears the contents of this builder.
Clears the contents of this builder. After execution of this method the builder will contain no elements.
Attributes
Source
The number of elements in the collection under construction, if it can be cheaply computed, -1 otherwise.
The number of elements in the collection under construction, if it can be cheaply computed, -1 otherwise.
Attributes
Returns
The number of elements. The default implementation always returns -1.
Definition Classes
Source
Result collection consisting of all elements appended so far.
A builder resulting from this builder by mapping the result using f.
A builder resulting from this builder by mapping the result using f.
Attributes
Inherited from:
Source
Gives a hint that the result of this builder is expected to have the same size as the given collection, plus some delta.
Gives a hint that the result of this builder is expected to have the same size as the given collection, plus some delta.
This method provides a hint only if the collection has a known size, as specified by the following pseudocode:
if (coll.knownSize != -1)
if (coll.knownSize + delta <= 0) sizeHint(0)
else sizeHint(coll.knownSize + delta)
If the delta is negative and the result size is known to be negative, then the size hint is issued at zero.
Some builder classes will optimize their representation based on the hint. However, builder implementations are required to work correctly even if the hint is wrong, i.e., if a different number of elements is added.
Value parameters
coll
the collection which serves as a hint for the result's size.
delta
a correction to add to the coll.size to produce the size hint (zero if omitted).
Attributes
Inherited from:
Source
Gives a hint how many elements are expected to be added in total by the time result is called.
Gives a hint how many elements are expected to be added in total by the time result is called.
Some builder classes will optimize their representation based on the hint. However, builder implementations are required to work correctly even if the hint is wrong, e.g., a different number of elements is added, or the hint is out of range.
The default implementation simply ignores the hint.
Value parameters
size
the hint how many elements will be added.
Attributes
Inherited from:
Source
Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.
Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.
Value parameters
boundingColl
the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.
size
the hint how many elements will be added.
Attributes
Inherited from:
Source
Adds two or more elements to this growable collection.
Adds two or more elements to this growable collection.
Value parameters
elem1
the first element to add.
elem2
the second element to add.
elems
the remaining elements to add.
Attributes
Returns
the growable collection itself
Deprecated
[Since version 2.13.0] Use `++=` aka `addAll` instead of varargs `+=`; infix operations with an operand of multiple args will be deprecated
Inherited from:
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