= 1) && ((number & (number - 1)) == 0); } constexpr uint64_t power(uint64_t number, uint8_t index){ uint64_t current{number}; for(uint8_t i{1}; i <= index; i++){ current *= number; } return current; } // implementation details: https://en.wikipedia.org/wiki/...
FNV-1a代码实现(C++) usingByte =uint8_t;constexpruint64_tc_offsetBasis =14695981039346656037;constexpruint64_tc_FNVPrime =1099511628211;uint64_tfnv1a(Byte* bs,size_tlen){uint64_th = c_offsetBasis;for(size_ti =0; i < len; ++i) { h = h ^ bs[i]; h = h * c_FNVPrime; }retur...
#if defined(_WIN64) _INLINE_VAR constexpr size_t _FNV_offset_basis = 14695981039346656037ULL; _INLINE_VAR constexpr size_t _FNV_prime = 1099511628211ULL; #else // defined(_WIN64) _INLINE_VAR constexpr size_t _FNV_offset_basis = 2166136261U; _INLINE_VAR constexpr size_t _FNV_prime ...
Expr Expr::substitute(conststd::hash_map<Expr, Expr, ExprHashFunction>map)const{ExprManagerScopeems(*this);returnExpr(d_exprManager,newNode(d_node->substitute(mkNodePairIteratorAdaptor(map.begin()), mkNodePairIteratorAdaptor(map.end())); } 开发者ID:ahmedirfan1983,项目名称:CVC4,代码行数:4,...
#include<unordered_map>#include<tuple>/** 实现std::tuple的hash函数*/template<std::size_tIndex=0,typename...Types>size_thashTuple(conststd::tuple<Types...>&t,size_tsum_hash=0){ifconstexpr(Index<sizeof...(Types))// C++ 17 特性 if constexpr{size_tcurrent_hash=std::hash<typenamestd...
{ template <> class hash<Employee> { public: std::uint64_t operator()(const Employee& employee) const { // 用 Fowler-Noll-Vo hash 哈散列函数的变体计算 employee 的散列值 constexpr std::uint64_t prime{0x100000001B3}; std::uint64_t result{0xcbf29ce484222325}; for (std::uint64_t i...
原因很简单，它没有添加到标准中。散列其他结构也是如此，比如tuple。
($bits:expr, $reverse:expr, $doc:literal) => { #[cfg(feature = "schemars")] use crate::alloc::{borrow::ToOwned, boxed::Box, string::String}; #[doc = $doc] #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] #[repr(transparent)] 14 changes: 9 additions & 5 delet...
{ public: std::uint64_t operator()(const Employee& employee) const { // computes the hash of an employee using a variant // of the Fowler-Noll-Vo hash function constexpr std::uint64_t prime{0x100000001B3}; std::uint64_t result{0xcbf29ce484222325}; for (std::uint64_t i{}, ie...