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 ...
"need unsigned integer"); public: using result_type = ResultT; private: result_type state_ {}; public: constexpr basic_fnv1a() noexcept : state_ {OffsetBasis} { } constexpr void update(const void *const data, const std::size_
静态初始化constexpr std::包含函数指针的对象数组 js hash函数 hash函数详解 std::hash<MyClass>的转发声明 带有函数对象的std::for_each 结构std::hash<T>与名称空间标准{结构hash<T> }有什么不同? PHP:静态和非静态函数和对象 对std :: hash <string>的未定义引用 std::hash模板专门化的正向声明 Node...
#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...
+constexpr std::size_t TestNumInputs = 1024; + +template <class _Size> +inline TEST_ALWAYS_INLINE _Size loadword(const void* __p) { + _Size __r; + std::memcpy(&__r, __p, sizeof(__r)); + return __r; +} + +inline TEST_ALWAYS_INLINE std::size_t hash_len_16(std:...
($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...
我的问题是这段代码到底是如何工作的:constexpr int i = 0;现在,如果我编写以下代码,它将失败:std::cout << 浏览14提问于2019-11-01得票数 0 回答已采纳 2回答 c++使用std::enable_if有条件地将getter添加到变量变体模板中 、、、 到目前为止我的尝试是:#include <variant>#include <type_traits> struct...
= 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/...