(__ptr=0xffff1e42f010, __clength=2699240960, __seed=3339675911) at /usr/include/c++/7.3.0/bits/functional_hash.h:192 #2 0x00000000004018c8 in std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::operator() (this=0xffffffffe5c8, __s=...
{ if (node == nullptr) { return 0; } size_t seed = hash<int>{}(node->data); seed ^= hash<Node*>{}(node->left) + 0x9e3779b9 + (seed << 6) + (seed >> 2); seed ^= hash<Node*>{}(node->right) + 0x9e3779b9 + (seed << 6) + (seed >> 2); return seed;...
hashcode=hashcode*seed+((*p)>>((sizeof(uint64_t)-tail)<<3));// 大端模式#else#error unexpected ccomplier(msc/gcc)#endifreturn(result_type)hashcode;}};/* SFINAE 判断T有没有std::hash<T>特例实现 */template<typenameU>staticstd::hash<U>test(decltype(declval<std::hash<U>>().operator()...
通过二次探测和 SIMD 查找实现的 哈希表。默认情况下,HashMap 使用选择为提供对 HashDoS 攻击的抵抗力的哈希算法。该算法是随机播种的,并且做出了合理的努力以从主机提供的高质量,安全的随机性源生成此 seed,而不会阻塞程序。因此,seed 的随机性取决于创建 seed 时系统随机数发生器的输出质量。特别地,当系统的熵...
//define hash function for strings enum { //parameters for hash table bucket_size = 4,//一个桶4byte长度(因为sizeof(char*)=4) min_buckets = 8//最少存在8个桶 }; size_toperator()(constchar* str)const { unsignedintseed = 131;//31 131 1313 13131 131313 etc.. ...
XXH64_hash_t hash = XXH64(buffer, size, seed); } Streaming variant is more involved, but makes it possible to provide data incrementally: #include "stdlib.h" /* abort() */ #include "xxhash.h" XXH64_hash_t calcul_hash_streaming(FileHandler fh) { /* create a hash state */ XXH64...
using google::dense_hash_map; // namespace where class lives by default using namespace std; inline unsigned int BKDRHash(const string& str) { unsigned int seed = 131; // 31 131 1313 13131 131313 etc.. unsigned int hash = 0;
{ size_t value = _HASH_SEED; size_t size = str.GetLength(); if (size > 0) { size_t temp = (size / 16) + 1; size -= temp; for (size_t idx = 0; idx <= size; idx += temp) { value += (size_t)str[(int)idx]; ...
struct PersonHash { std::size_t operator()(const Person& p) const { std::size_t seed = 0; boost::hash_combine(seed, boost::hash_value(p.name)); boost::hash_combine(seed, boost::hash_value(p.age)); return seed; } }; 在这个例子中,我们使用boost::hash_combine来组合多个...
在使用events_statements_current的过程中发现，同一线程在同一时刻，可能有多条记录，与直观感觉不太一样...