#include <iostream>#include <unordered_map>intmain(){std::unordered_map<int,char>example{{1,'a'},{2,'b'}};for(intx:{2,5})if(example.contains(x))std::cout<<x<<": 找到\n";elsestd::cout<<x<<": 未找到\n";} 输出:
(const unordered_multimap<Key, T, Hash, Pred, Alloc>& a, const unordered_multimap<Key, T, Hash, Pred, Alloc>& b); template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_map<Key, T, Hash, Pred, Alloc>& x, unordered_map<Key, T, Hash, Pred, ...
unordered_map::count unordered_map::find unordered_map::contains (C++20) unordered_map::equal_range Bucket interface unordered_map::begin(size_type)unordered_map::cbegin(size_type) unordered_map::end(size_type)unordered_map::cend(size_type) ...
unordered_map::count unordered_map::find unordered_map::contains (C++20) unordered_map::equal_range Bucket interface unordered_map::begin(size_type)unordered_map::cbegin(size_type) unordered_map::end(size_type)unordered_map::cend(size_type) ...
map−multimap−set−multiset 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 ...
#include<iostream>#include<string>#include<unordered_map>template<typenameT>void_format_output(std::ostream& out, T x) {ifconstexpr(std::is_same<T,bool>::value) { out << std::boolalpha << x << std::noboolalpha; }elseifconstexpr(std::is_integral<T>::value) { out <<static_cast...
std::map<std::string, int> c_map { {"one", 1}, {"two", 2}, {"three", 3} }; json j_map(c_map); // {"one": 1, "three": 3, "two": 2 } std::unordered_map<const char*, double> c_umap { {"one", 1.2}, {"two", 2.3}, {"three", 3.4} }; json j_umap(c_...
sqlitemap - Persistent map backed by SQLite. [MIT] st_tree - A fast and flexible c++ template class for tree data structures. [Apache-2.0] svector - Compact SVO optimized vector for C++17 or higher. [MIT] tree.hh - An STL-like C++ header-only tree library. [GPL2+] unordered_dense...
if (compileContextInfoJson.contains("updateVersionInfo") && compileContextInfoJson["updateVersionInfo"].is_object()) { std::unordered_map<std::string, std::map<std::string, PkgInfo>> updateVersionInfo {}; for (const auto& [abcName, versionInfo] : compileContextInfoJson["updateVersion...
OOP之类和对象 1. this指针的引入 每个成员函数都有一个额外的隐含的形参,这个参数就是this指针,它指向调用对象的地址。默认情况下,this的类型是指向类类型非常量版本的常量指针。可以表示成如下伪代码形式: /* 假设现在有一个类Sales_data,以及其非常量Sales_data类型