C Set collection

Question

Does anyone know if there is a good equivalent to Java s Set collection in C   I know that you can somewhat mimic a set using a Dictionary or a HashTable by populating but ignoring the values  but that s not a very elegant way

User · Answer

I use Iesi Collections http   www codeproject com KB recipes sets aspx  It s used in lot of OSS projects  I first came across it in NHibernate

User · Answer

Have a look at PowerCollections over at CodePlex  Apart from Set and OrderedSet it has a few other usefull collection types such as Deque  MultiDictionary  Bag  OrderedBag  OrderedDictionary and OrderedMultiDictionary   For more collections  there is also the C5 Generic Collection Library

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If you re using  NET 3 5  you can use HashSet lt T gt   It s true that  NET doesn t cater for sets as well as Java does though   The Wintellect PowerCollections may help too

User · Answer

I use Iesi Collections http   www codeproject com KB recipes sets aspx  It s used in lot of OSS projects  I first came across it in NHibernate

User · Answer

Try HashSet      The HashSet Of T  class provides high-performance set operations  A set is a collection that contains no duplicate elements  and whose elements are in no particular order         The capacity of a HashSet Of T  object is the number of elements that the object can hold  A HashSet Of T  object s capacity automatically increases as elements are added to the object       The HashSet Of T  class is based on the model of mathematical sets and provides high-performance set operations similar to accessing the keys of the Dictionary Of TKey  TValue  or Hashtable collections  In simple terms  the HashSet Of T  class can be thought of as a Dictionary Of TKey  TValue  collection without values       A HashSet Of T  collection is not sorted and cannot contain duplicate elements

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If you re using  NET 4 0 or later   In the case where you need sorting then use SortedSet lt T gt   Otherwise if you don t  then use HashSet lt T gt  since it s O 1  for search and manipulate operations  Whereas SortedSet lt T gt  is O log n  for search and manipulate operations

User · Answer

Have a look at PowerCollections over at CodePlex  Apart from Set and OrderedSet it has a few other usefull collection types such as Deque  MultiDictionary  Bag  OrderedBag  OrderedDictionary and OrderedMultiDictionary   For more collections  there is also the C5 Generic Collection Library

User · Answer

I know this is an old thread  but I was running into the same problem and found HashSet to be very unreliable because given the same seed  GetHashCode   returned different codes   So  I thought  why not just use a List and hide the add method like this  public class UniqueList lt T gt    List lt T gt        public new void Add T obj                if  Contains obj                         base Add obj                       Because List uses the Equals method solely to determine equality  you can define the Equals method on your T type to make sure you get the desired results

User · Answer

I use Iesi Collections http   www codeproject com KB recipes sets aspx  It s used in lot of OSS projects  I first came across it in NHibernate

User · Answer

I use Iesi Collections http   www codeproject com KB recipes sets aspx  It s used in lot of OSS projects  I first came across it in NHibernate

User · Answer

If you re using  NET 3 5  you can use HashSet lt T gt   It s true that  NET doesn t cater for sets as well as Java does though   The Wintellect PowerCollections may help too

User · Answer

Try HashSet      The HashSet Of T  class provides high-performance set operations  A set is a collection that contains no duplicate elements  and whose elements are in no particular order         The capacity of a HashSet Of T  object is the number of elements that the object can hold  A HashSet Of T  object s capacity automatically increases as elements are added to the object       The HashSet Of T  class is based on the model of mathematical sets and provides high-performance set operations similar to accessing the keys of the Dictionary Of TKey  TValue  or Hashtable collections  In simple terms  the HashSet Of T  class can be thought of as a Dictionary Of TKey  TValue  collection without values       A HashSet Of T  collection is not sorted and cannot contain duplicate elements

User · Answer

Have a look at PowerCollections over at CodePlex  Apart from Set and OrderedSet it has a few other usefull collection types such as Deque  MultiDictionary  Bag  OrderedBag  OrderedDictionary and OrderedMultiDictionary   For more collections  there is also the C5 Generic Collection Library

User · Answer

I use a wrapper around a Dictionary lt T  object gt   storing nulls in the values  This gives O 1  add  lookup and remove on the keys  and to all intents and purposes acts like a set

User · Answer

Try HashSet      The HashSet Of T  class provides high-performance set operations  A set is a collection that contains no duplicate elements  and whose elements are in no particular order         The capacity of a HashSet Of T  object is the number of elements that the object can hold  A HashSet Of T  object s capacity automatically increases as elements are added to the object       The HashSet Of T  class is based on the model of mathematical sets and provides high-performance set operations similar to accessing the keys of the Dictionary Of TKey  TValue  or Hashtable collections  In simple terms  the HashSet Of T  class can be thought of as a Dictionary Of TKey  TValue  collection without values       A HashSet Of T  collection is not sorted and cannot contain duplicate elements

User · Answer

If you re using  NET 3 5  you can use HashSet lt T gt   It s true that  NET doesn t cater for sets as well as Java does though   The Wintellect PowerCollections may help too

User · Answer

Try HashSet      The HashSet Of T  class provides high-performance set operations  A set is a collection that contains no duplicate elements  and whose elements are in no particular order         The capacity of a HashSet Of T  object is the number of elements that the object can hold  A HashSet Of T  object s capacity automatically increases as elements are added to the object       The HashSet Of T  class is based on the model of mathematical sets and provides high-performance set operations similar to accessing the keys of the Dictionary Of TKey  TValue  or Hashtable collections  In simple terms  the HashSet Of T  class can be thought of as a Dictionary Of TKey  TValue  collection without values       A HashSet Of T  collection is not sorted and cannot contain duplicate elements

User · Answer

If you re using  NET 3 5  you can use HashSet lt T gt   It s true that  NET doesn t cater for sets as well as Java does though   The Wintellect PowerCollections may help too

User · Answer

If you re using  NET 4 0 or later   In the case where you need sorting then use SortedSet lt T gt   Otherwise if you don t  then use HashSet lt T gt  since it s O 1  for search and manipulate operations  Whereas SortedSet lt T gt  is O log n  for search and manipulate operations

User · Answer

I use a wrapper around a Dictionary lt T  object gt   storing nulls in the values  This gives O 1  add  lookup and remove on the keys  and to all intents and purposes acts like a set

User · Answer

I know this is an old thread  but I was running into the same problem and found HashSet to be very unreliable because given the same seed  GetHashCode   returned different codes   So  I thought  why not just use a List and hide the add method like this  public class UniqueList lt T gt    List lt T gt        public new void Add T obj                if  Contains obj                         base Add obj                       Because List uses the Equals method solely to determine equality  you can define the Equals method on your T type to make sure you get the desired results

User · Answer

Have a look at PowerCollections over at CodePlex  Apart from Set and OrderedSet it has a few other usefull collection types such as Deque  MultiDictionary  Bag  OrderedBag  OrderedDictionary and OrderedMultiDictionary   For more collections  there is also the C5 Generic Collection Library

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