检查值存在于std :: map - C ++ 中 我知道find方法在std :: map中找到提供的键,并将迭代器返回给元素。反正有没有找到值并获得元素的迭代器?我需要做的是检查std :: map中是否存在指定的值。我通过循环地图中的所有项目并进行比较来完成此操作。但我想知道有没有更好的方法。 这是我写的 bool ContainsV...
std::map<Key,T,Compare,Allocator>::insert std::map<Key,T,Compare,Allocator>::emplace_hint std::map<Key,T,Compare,Allocator>::erase std::map<Key,T,Compare,Allocator>::swap std::map<Key,T,Compare,Allocator>::count std::map<Key,T,Compare,Allocator>::find std::map<Key,T,Compare,Alloc...
int>mymap;8std::map<char,int>::iterator it;910mymap['a']=50;11mymap['b']=100;12mymap['c']=150;13mymap['d']=200;1415it = mymap.find('b');16if(it !=mymap.end())17mymap.erase (it);1819//print content:20std::cout <<"elements in mymap:"<<'\n';21std::cout <<...
std::map<NHSymbolkey*, Stru_NHSymbol*>* pmapNHSymbolInfo2 其中,pmapNHSymbolInfo1、pmapNHSymbolInfo2中使用find正常,遍历也正常,pmapNHSymbolInfo3使用find查找不到对应的数据(数据已经存在,find不到,遍历可以找到) 原因:std::map<NHSymbolkey*, Stru_NHSymbol*>* pmapNHSymbolInfo2在find的时候是根据指针...
1#include <iostream>2#include <cstdio>3#include <cstring>4#include <string>5#include <map>6usingnamespacestd;78intmain()9{10map<string,int>Map;11map<string,int>::iterator it;12Map.insert(pair<string,int>("root",12));13Map.insert(pair<string,int>("scot",11));14for(it=Map.begin...
cout<<"we do not find 112"<<endl; else maplive.erase(l_it); //delete 112; 5,map中 swap的用法: Map中的swap不是一个容器中的元素交换,而是两个容器交换; For example: #include <map> #include <iostream> using namespace std; int main( ) ...
std::multimap<s_map_key, std::string>::iterator x = myMap.find(smk); if(x != myMap.end()) { std::cout << x->first.a <<std::endl; std::cout << x->first.b <<std::endl; } return 0; } 我想做的是在A = 2,B = 2或A&B = 2的所有情况下搜索多图。我不确定,但是,我...
(newT ) );#endifBOOST_TEST_MESSAGE("finished set/map interface test");// @todo: make macro with algorithms so that the right erase() is called.// c.unique();// c.unique( std::not_equal_to<T>() );// c.remove( T() );// c.remove_if( std::binder1st< std::equal_to<T>...
operator<(), operator>(), operator<=(), and operator>=() were previously available for the std::unordered_map and stdext::hash_map families of containers, although their implementations were not useful. These non-standard operators have been removed in Visual C++ in Visual Studio 2012. Addit...
using namespace std; int main(){ map<int, int> mp; for (int i = 0; i < 10; i ++){ mp[i] = i; } for (int i = 10; i < 20; i++){ mp.insert(make_pair(i, i)); } map<int, int>::iterator it; for (it = mp.begin(); it != mp.end(); it++){ ...