Search results
Results from the WOW.Com Content Network
The hash_* class templates were proposed into C++ Technical Report 1 (C++ TR1) and were accepted under names unordered_*. [3] Later, they were incorporated into the C++11 revision of the C++ standard. [4] An implementation is also available in the Boost C++ Libraries as <boost/unordered_map.hpp>. [5]
In computing, a hash table is a data structure that implements an associative array, also called a dictionary or simply map; an associative array is an abstract data type that maps keys to values. [2] A hash table uses a hash function to compute an index, also called a hash code, into an array of buckets or slots, from which the desired value ...
In Smalltalk, Objective-C, .NET, [20] Python, REALbasic, Swift, VBA and Delphi [21] they are called dictionaries; in Perl, Ruby and Seed7 they are called hashes; in C++, C#, Java, Go, Clojure, Scala, OCaml, Haskell they are called maps (see map (C++), unordered_map (C++), and Map); in Common Lisp and Windows PowerShell, they are called hash ...
Both maps and sets support bidirectional iterators. For more information on iterators, see Iterators. While not officially part of the STL standard, hash_map and hash_set are commonly used to improve searching times.
Although std::map is typically implemented using a self-balancing binary search tree, C++11 defines a second map called std::unordered_map, which has the algorithmic characteristics of a hash table. This is a common vendor extension to the Standard Template Library (STL) as well, usually called hash_map , available from such implementations as ...
Large maps in Erlang use a persistent HAMT representation internally since release 18.0. [9] The Pony programming language uses a HAMT for the hash map in its persistent collections package. [10] The im and im-rc crates, which provide persistent collection types for the Rust programming language, use a HAMT for their persistent hash tables and ...
hash_map hash_multimap similar to a set, multiset, map, or multimap, respectively, but implemented using a hash table; keys are not ordered, but a hash function must exist for the key type. These types were left out of the C++ standard; similar containers were standardized in C++11, but with different names (unordered_set and unordered_map ...
Additionally, concurrent hash maps are provided which build upon the concurrent unordered map and further allow concurrent erasure and contain built-in locking. [13] growt provides concurrent growing hash tables for C++ on the basis of the so-called folklore implementation. Based on this non-growing implementation, a variety of different ...