template< class Key > struct hash; (since C++11) The enabled specializations of the hash template define a function object that implements a hash function. Given a type Key, each specialization std::hash<Key>
std::hash 对各种字符串类的模板特化允许用户获得字符串的散列。 这些散列值与对应的 std::basic_string_view 类的散列相等:若 S 是这些字符串类型之一,SV 是对应的字符串视图类型,而 s 是S 类型的对象,则 std::hash<S>()(s) == std::hash<SV>()(SV(s))。 (C++17 起)...
GCC实现我没看.std::hash - cppreference.comzh.cppreference.com/w/cpp/utility/hash
std::hash<std::vector<bool>> From cppreference.com Defined in header<vector> template<classAllocator> structhash<std::vector<bool, Allocator>>; (since C++11) The template specialization ofstd::hashforstd::vector<bool>allows users to obtain hashes of objects of typestd::vector<bool>. ...
hash function object (class template) 代码语言:txt 复制 © cppreference.com 在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。 http://en.cppreference.com/w/cpp/string/basic[医]字符串/散列 本文档系腾讯云开发者社区成员共同维护,如有问题请联系cloudcommunity@tencent.com ...
c++11 std::hash 的使用 原文转自:http://zh.cppreference.com/w/cpp 在头文件<functional>中定义 template<class Key> struct hash;// not defined (C++11 起) 哈希模板定义一个函数对象,实现了散列函数。这个函数对象的实例定义一个operator() 1。接受一个参数的类型Key....
2)If the container has an element with key equivalent tok, unlinks the node that contains that element from the container and returns anode handlethat owns it. Otherwise, returns an empty node handle. 3)Same as(2). This overload participates in overload resolution only ifHash::is_transparen...
std::hash std::hash <std::optional> std::hash <std::unique_ptr> std::hash <std::variant> std::hash(std::shared_ptr) std::hash::hash std::hash<std::error_code> std::hash<std::error_condition> std::hash<std::type_index> std::has_unique_object_representations std::has_virtual_...
std::hash<std::bitset> (C++11) hash support forstd::bitset (class template specialization) Notes If the size of a bit-set is not known at compile time, or it is necessary to change its size at run-time, the dynamic types such asstd::vector<bool>orboost::dynamic_bitset<>may be use...
For every type Key for which neither the library nor the user provides an enabled specialization std::hash<Key>, that specialization exists and is disabled. Disabled specializations do not satisfy Hash, do not satisfy FunctionObject, and std::is_default_constructible_v, std::is_copy_...