Hash function quality and speed tests. Contribute to rurban/smhasher development by creating an account on GitHub.
C字符串没有专门化。std::hash<const char*>产生指针%28内存地址%29的值的散列,它不检查任何字符数组的内容。 成员类型 Member type Definition argument_type(deprecated in C++17) Key result_type(deprecated in C++17) std::size_t 成员函数 (constructor) constructs a hash function object (public member...
/// @brief BKDR Hash Function /// @detail 本 算法由于在Brian Kernighan与Dennis Ritchie的《The C Programming Language》一书被展示而得 名,是一种简单快捷的hash算法,也是Java目前采用的字符串的Hash算法(累乘因子为31)。 template<class T> size_t BKDRHash(const T *str) { register size_t hash =...
Since thefinalfunction is non-destructive to the context structure, the function can be used to obtain intermediate "incremental" hashes of the data stream being hashed, and the hashing can then be resumed. The hash value produced via streamed hashing can be used in the discrete-incremental ha...
若结构中存在和关键字K相等的记录,则必定在f(K)的存储位置上。由此,不需比较便可直接取得所查记录。称这个对应关系f为 散列函数(Hash function),按这个事先建立的表为散列表。 给定表M,存在函数f(key),对任意给定的关键字值key,代入函数后若能得到包含该关键字的记录在表中的地址,则称表M为哈希(Hash)表,...
* any_t is a pointer. This allows you to put arbitrary structures in * the hashmap. */ typedef void *any_t; /* * PFany is a pointer to a function that can take two any_t arguments * and return an integer. Returns status code.. ...
In E-discovery: Creating and Managing an Enterprisewide Program, 2009 Hashing Hashing has evolved into a widely used function with numerous applications in the computer industry, including databases, passwords, encryptions, and many others. In the digital forensic and e-discovery field, hashing is ...
In this paper, we introduce new hash function design princi-ples with variable output lengths (multiple of n). It is based on a function or a block cipher which has output size n. In the random oracle model it has optimal collision resistance which requires Θ(2 (t+1)n/2) queries to...
This class offers constant time performance for the basic operations (add,remove,containsandsize), assuming the hash function disperses the elements properly among the buckets. Iterating over this set requires time proportional to the sum of theHashSetinstance's size (the number of elements) plus...
In particular, cryptographic hash functions exhibit these three properties:3 They are collision-free: This means that no two different input hashes should map to the same output hash. They can be hidden: It is difficult to guess the input value for a hash function from its output. ...