8};// creates a set of intsprint(mySet);mySet.insert(5);// puts an element 5 in the setprint(mySet);if(autoiter=mySet.find(5);iter!=mySet.end())mySet.erase(iter);// removes an element pointed to by iterprint(mySet);mySet.erase(7);// removes an element 7print(mySet);...
Internally, the elements in the unordered_set are not sorted in any particular order, but organized into buckets depending on their hash values to allow for fast access to individual elements directly by their values (with a constant average time complexity on average). unordered_set containers ar...
#include<iostream>#include<unordered_set>using namespace std;intmain(){// 1. initialize a hash setunordered_set<int>hashset;// 2. insert a new keyhashset.insert(1);hashset.insert(2);hashset.insert(3);// 3. delete a keyhashset.erase(2);// 4. check if the key is in the hash...
总的来说,任何类型都可以作为std::unordered_map或std::unordered_set的键值,只要为其提供适当的哈希函数和等于运算符即可。 以下是一些常见类型是否可以直接用作std::unordered_map或std::unordered_set键值的简单摘要。请注意,这些是基于C++标准库为这些类型提供默认的哈希函数和等于运算符的情况,如果你为某种类型提...
C++11 unordered_set::emplace C++11 unordered_set::emplace_hint C++11 unordered_set::empty C++11 unordered_set::end C++11 unordered_set::equal_range C++11 unordered_set::erase C++11 unordered_set::find C++11 unordered_set::get_allocator C++11 unordered_set::hash_function C++11...
// swap (unordered_set specialization)#include <iostream>#include <string>#include <unordered_set>intmain () { std::unordered_set<std::string> first = {"Metropolis","Solaris","Westworld"}, second = {"Avatar","Inception"}; swap(first,second); std::cout <<"first:";for(conststd::strin...
unordered_set::load_factor unordered_set::max_load_factor unordered_set::rehash unordered_set::reserve Observers unordered_set::hash_function unordered_set::key_eq Non-member functions operator==operator!= (C++11)(C++11)(until C++20) std::swap(std::unordered_set) (C++11) erase_if(std::...
skottmckaychanged the title<header>: unordered_set<string_view> access violation if clear() is called and fast path is taken in debug buildOct 1, 2022 Probably comes down to the fast path using _Unchecked_erase which has an implicit requirement that the values are all still valid as it ca...
The're fullfilling different purposes, one is a map, one is a set. If you need a map, use the map. If you need a set, use the set. performance and memory arenotthe relevant differences. 这完全是不同的目的,一个是地图,一个是集合。如果需要地图,请使用地图。如果需要集合,请使用集合。性...
() << std::endl; myset = {"milk","potatoes","eggs"}; std::cout <<"1. size: "<< myset.size() << std::endl; myset.insert ("pineapple"); std::cout <<"2. size: "<< myset.size() << std::endl; myset.erase ("milk"); std::cout <<"3. size: "<< myset.size()...