Map_::iterator it = internalMap.begin(); // internalMap is std::map while(it != internalMap.end()) { found = (it->second == value); if(found) break; ++it; } return found; } 编辑 如何在内部使用另一个存储值,键组合的地图。所以我可以打电话找到它吗?在std :: map中find()进行顺...
public: find_myInt(key_struct const & kStruct): myStruct(kStruct) {} bool operator() (yourMapType const & m) const { bool result = true; if (myStruct.x > 0) result &= (myStruct.x == m.first.x); if (myStruct.y != \"\") result...
因此,若只是查找该元素是否存在,可以使用函数count(k),该函数返回的是k出现的次数;若是想取得key对应的值,可以使用函数find(k),该函数返回的是指向该元素的迭代器。 上述的两个函数的使用如下所示: #include <stdio.h> #include <map> using namespace std; int main(){ map<int, int> mp; for (int ...
#include<stdio.h>#include<map>using namespace std;intmain(){map<int,int>mp;for(int i=0;i<20;i++){mp.insert(make_pair(i,i));}if(mp.count(0)){printf("yes!\n");}else{printf("no!\n");}map<int,int>::iterator it_find;it_find=mp.find(0);if(it_find!=mp.end()){it_f...
std::string baz; bool operator<(const Foo& rhs) const { if (bar < rhs.bar && baz < rhs.baz) { return true; } else { return false; } } }; int main() { Foo first(0,"test"); Foo second(1,"test"); std::map<Foo, std::string> m; m.insert(std::make_pair(first,"test...
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include<map>5#include<algorithm>6usingnamespacestd;7intmain(){8map<string,int>mp;9mp.insert(make_pair("a",1));10mp.insert(make_pair("b",2));11map<string,int>::iterator it;12cout<<mp.count("a")<<endl;13mp.insert(make_pair("a",2));14it=mp.find("a");15if(it==mp.end...
(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>...
map [] 运算符 易出错点 出错代码: #include<bits/stdc++.h>usingnamespacestd; vector<int> FindNumbersWithSum(vector<int> array,intsum) { vector<int>ans; map<int,int>mp;for(inti=0;i<array.size();i++) mp[array[i]]++;for(map<int,int>::iterator it = mp.begin();it!=mp.end()...
find_first_of("!@#$%^&*()"); if (index != std::string::npos) { std::cout << "特殊字符的索引为: " << index << std::endl; } else { std::cout << "未找到特殊字符" << std::endl; } return 0; } 在上述示例代码中,我们使用了find_first_of函数来查找字符串中第一个...