std::unordered_map满足容器(Container)、知分配器容器(AllocatorAwareContainer)和无序关联容器(UnorderedAssociativeContainer)。 迭代器失效 操作失效 所有只读操作、swap、std::swap决不 clear、rehash、reserve、operator=始终 insert、emplace、emplace_hint、operator[]仅限重散列的情况 ...
#include <iostream>#include <string>#include <unordered_map>intmain(){std::unordered_map<int,std::string>dict={{1,"one"},{2,"two"}};dict.insert({3,"three"});dict.insert(std::make_pair(4,"four"));dict.insert({{4,"another four"},{5,"five"}});constboolok=dict.insert({1,...
#include <iostream>#include <string>#include <unordered_map>intmain(){std::unordered_map<int,std::string>dict={{1,"one"},{2,"two"}};dict.insert({3,"three"});dict.insert(std::make_pair(4,"four"));dict.insert({{4,"another four"},{5,"five"}});constboolok=dict.insert({1,...
Defined in header<unordered_map> iterator insert(constvalue_type&value); (1)(since C++11) iterator insert(value_type&&value); (2)(since C++17) template<classP> iterator insert(P&&value); (3)(since C++11) iterator insert(const_iterator hint,constvalue_type&value); ...
unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors span(C++20)−mdspan(C++23) Iterators library Ranges library(C++20) Range factories−Range adaptors generator(C++23) Algorithms library ...
(class template) unordered_map (C++11) collection of key-value pairs, hashed by keys, keys are unique (class template) flat_map (C++23) adapts two containers to provide a collection of key-value pairs, sorted by unique keys (class template)...
Insert element using stl::pair:>> auto mm = std::unordered_map<std::string, int>{}; >> mm.insert(std::make_pair("x", 200)); >> mm.insert(std::make_pair("z", 500)); >> mm.insert(std::make_pair("w", 10)); >> mm["x"] (int) 200 >> mm["w"] (int) 10 >> ...
map和set#include<iostream> #include<map> // 注意map的key会自动排序, 所以在遇到排序问题时参考 #include<algorithm> #include<vector> #include <unordered_map> using namespace std; // map中 所有元素都是pair // pair中 第一个元素为key(键值) 用于索引 第二个元素value(实值) // 所有元素都...
155 resultsMap.insert(result.begin, result); 156 return; 157 } 158 159 if (reduceOptions & UnorderedReduce) { 160 // UnorderedReduce 161 progress = -1; 162 163 // reduce this result 164 locker.unlock(); 165 reduceResult(reduce, r, result); 16...
// Helper classes for implementing std::unordered_map of // VertexBuffers. struct Key { Key( const std::shared_ptr<Array<float> >& array, const MHWRender::MVertexBufferDescriptor& desc ) : fArrayKey(array->key()), fName(desc.name().asChar()), fSemantic(desc.semantic()), fData...