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...
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);...
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...
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...
// 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 Vs. unordered_multiset unordered_set: A container that stores unique elements only, no duplicates are allowed. unordered_multiset: A container that allows multiple occurrences (duplicates) of the same element. Average Time Complexity of unordered_multiset unordered_multiset is implemented ...
unordered_map are not sorted in any particular order with respect to either their key or mapped values, but organized into buckets(桶) depending on their hash values to allow for fast access to individual elements directly by their key values (with a constant average time complexity on average...
stdunordered_mapumcout<<"Unordered map contains following elements before erase operation"<<endl;for(autoit=um.begin();it!=um.end();++it)cout<<it->first<<" = "<<it->second<<endl;um.erase(um.begin());cout<<endl;cout<<"Unordered map contains following elements after erase operation"<...
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::...
std::unordered_set::begin container iterator (1) iterator begin() noexcept;const_iterator begin() const noexcept; bucket iterator (2) local_iterator begin ( size_type n );const_local_iterator begin ( size_type n ) const; Return iterator to beginning ...