Package it.unimi.dsi.fastutil.doubles

Class DoubleOpenHashBigSet

java.lang.Object
java.util.AbstractCollection<Double>
it.unimi.dsi.fastutil.doubles.AbstractDoubleCollection
it.unimi.dsi.fastutil.doubles.AbstractDoubleSet
it.unimi.dsi.fastutil.doubles.DoubleOpenHashBigSet
All Implemented Interfaces:
DoubleCollection, DoubleIterable, DoubleSet, Hash, Size64, Serializable, Cloneable, Iterable<Double>, Collection<Double>, Set<Double>
public class DoubleOpenHashBigSet
extends AbstractDoubleSet
implements Serializable, Cloneable, Hash, Size64
A type-specific hash big set with with a fast, small-footprint implementation.

Instances of this class use a hash table to represent a big set: the number of elements in the set is limited only by the amount of core memory. The table (backed by a big array) is filled up to a specified load factor, and then doubled in size to accommodate new entries. If the table is emptied below one fourth of the load factor, it is halved in size; however, the table is never reduced to a size smaller than that at creation time: this approach makes it possible to create sets with a large capacity in which insertions and deletions do not cause immediately rehashing. Moreover, halving is not performed when deleting entries from an iterator, as it would interfere with the iteration process.

Note that clear() does not modify the hash table size. Rather, a family of trimming methods lets you control the size of the table; this is particularly useful if you reuse instances of this class.

The methods of this class are about 30% slower than those of the corresponding non-big set.

See Also:
Hash, HashCommon, Serialized Form

  • Constructor Details

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(long expected, float f)
      Creates a new hash big set.

      The actual table size will be the least power of two greater than expected/f.

      Parameters:
      expected - the expected number of elements in the set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(long expected)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor.
      Parameters:
      expected - the expected number of elements in the hash big set.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet()
      Creates a new hash big set with initial expected Hash.DEFAULT_INITIAL_SIZE elements and Hash.DEFAULT_LOAD_FACTOR as load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(Collection<? extends Double> c, float f)
      Creates a new hash big set copying a given collection.
      Parameters:
      c - a Collection to be copied into the new hash big set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(Collection<? extends Double> c)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given collection.
      Parameters:
      c - a Collection to be copied into the new hash big set.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(DoubleCollection c, float f)
      Creates a new hash big set copying a given type-specific collection.
      Parameters:
      c - a type-specific collection to be copied into the new hash big set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(DoubleCollection c)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific collection.
      Parameters:
      c - a type-specific collection to be copied into the new hash big set.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(DoubleIterator i, float f)
      Creates a new hash big set using elements provided by a type-specific iterator.
      Parameters:
      i - a type-specific iterator whose elements will fill the new hash big set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(DoubleIterator i)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by a type-specific iterator.
      Parameters:
      i - a type-specific iterator whose elements will fill the new hash big set.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(Iterator<?> i, float f)
      Creates a new hash big set using elements provided by an iterator.
      Parameters:
      i - an iterator whose elements will fill the new hash big set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(Iterator<?> i)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor using elements provided by an iterator.
      Parameters:
      i - an iterator whose elements will fill the new hash big set.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(double[] a, int offset, int length, float f)
      Creates a new hash big set and fills it with the elements of a given array.
      Parameters:
      a - an array whose elements will be used to fill the new hash big set.
      offset - the first element to use.
      length - the number of elements to use.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(double[] a, int offset, int length)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor and fills it with the elements of a given array.
      Parameters:
      a - an array whose elements will be used to fill the new hash big set.
      offset - the first element to use.
      length - the number of elements to use.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(double[] a, float f)
      Creates a new hash big set copying the elements of an array.
      Parameters:
      a - an array to be copied into the new hash big set.
      f - the load factor.

    • DoubleOpenHashBigSet

      public DoubleOpenHashBigSet​(double[] a)
      Creates a new hash big set with Hash.DEFAULT_LOAD_FACTOR as load factor copying the elements of an array.
      Parameters:
      a - an array to be copied into the new hash big set.

  • Method Details