C++ multimap end()函数用于返回迭代器,该迭代器位于multimap中最后一个条目的旁边。
iterator end(); //until C++ 11 const_iterator end() const; //until C++ 11 iterator end() noexcept; //since C++ 11 const_iterator end() const noexcept; //since C++ 11
它返回一个指向multimap最后一个元素旁边的迭代器。
让我们看一下end()函数的简单示例:
#include <iostream> #include <map> using namespace std; int main () { multimap<char,string> mymultimap; mymultimap = { {'a',"Java"}, {'b', "C++"}, {'b', "Python"}, {'a', "Android"} }; //show content: for (multimap<char,string>::iterator it=mymultimap.begin(); it!=mymultimap.end(); ++it) cout << it->first << " => " << it->second << '\n'; return 0; }
输出:
a => Java a => Android b => C++ b => Python
在上面的示例中,end()函数用于返回指向mymultimap multimap中最后一个元素旁边的迭代器。
链接:https://www.learnfk.comhttps://www.learnfk.com/c++/cpp-multimap-end-function.html
来源:LearnFk无涯教程网
让我们看一个简单的示例,使用for-each循环遍历multimap:
#include <iostream> #include <map> #include <string> #include <iterator> #include <algorithm> using namespace std; int main() { multimap<string, int> m; m= { {"Room1", 100}, {"Room2", 200}, {"Room1", 300}, {"Room1", 100} }; // Create a multimap iterator and point to beginning of multimap multimap<string, int>::iterator it = m.begin(); // Iterate over a multimap using std::for_each and Lambda function for_each(m.begin(), m.end(), [](pair<string, int> element){ // Accessing KEY from element string word = element.first; // Accessing VALUE from element. int count = element.second; cout<<word<<" = "<<count<<endl; }); return 0; }
输出:
Room1 = 100 Room1 = 300 Room1 = 100 Room2 = 200
在上面的示例中,我们使用STL算法std ::for-each迭代multimap。它将在每个multimap元素上进行迭代,并调用我们提供的回调。
让我们看一个简单的示例,使用while循环遍历multimap:
#include <iostream> #include <map> #include <string> int main() { using namespace std; multimap<int,string> mymultimap = { { 100, "Nikita"}, { 200, "Deep" }, { 200, "Priya" }, { 400, "Suman" }, { 300, "Aman" }}; multimap<int, string>::const_iterator it;//declare an iterator it = mymultimap.begin();//assign it to the start of the vector while (it != mymultimap.end())//while it hasn't reach the end { cout << it->first << " = " << it->second << "\n"; // print the value of the element it points to ++it;//and iterate to the next element } cout << endl; return 0; }
输出:
100 = Nikita 200 = Deep 200 = Priya 300 = Aman 400 = Suman
在上面的示例中,end()函数用于返回指向mymultimap multimap中最后一个元素旁边的迭代器。
链接:https://www.learnfk.comhttps://www.learnfk.com/c++/cpp-multimap-end-function.html
来源:LearnFk无涯教程网
让我们看一个简单的例子:
#include <iostream> #include <string> #include <map> using namespace std; int main () { multimap<int,int> mymultimap = { { 10, 10}, { 20, 20 }, { 10, 30 }, { 20, 10} }; cout<<"Elements are:" <<endl; for (multimap<int,int>::iterator it=mymultimap.begin(); it!=mymultimap.end(); ++it) cout << it->first << " * " << it->second << " = " <<it->first * it->second << '\n'; return 0; }
输出:
Elements are: 10 * 10 = 100 10 * 30 = 300 20 * 20 = 400 20 * 10 = 200
在上面的示例中,end()函数用于返回指向mymultimap multimap中最后一个元素旁边的迭代器。
链接:https://www.learnfk.comhttps://www.learnfk.com/c++/cpp-multimap-end-function.html
来源:LearnFk无涯教程网
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