};cout<<"Initial size of map beforeclearoperation = "<< mymap.size() <<endl; mymap.clear();cout<<"Size of map afterclearopearation = "<< mymap.size() <<endl;return0; } 输出: Initial size of map beforeclearoperation = 5 Size of map afterclearopearation = 0 在上面的例子中,...
C++ 函数std::multimap::clear()通过删除所有元素并将 multimap 的大小设置为零来破坏 multimap。 声明 以下是 std::multimap::clear() 函数形式 std::map 头的声明。 C++98 void clear(); C++11 void clear() noexcept; 参数 空 返回值 空 异常 此成员函数从不抛出异常。 时间复杂度 线性,即 O(n)...
// map_max_size_etc_sample.cpp // compile with: /EHsc // // Functions: iterator map::max_size(); // void clear() const; // bool empty() const; // iterator erase(iterator first, iterator last); // size_type size() const; // A::reference operator[](const Key& key); ...
Themap elements after clearing all elements are: Different ways to delete elements in std::map (erase() and clear())
// cliext_map_clear.cpp // compile with: /clr #include <cliext/map> typedef cliext::map<wchar_t, int> Mymap; int main() { Mymap c1; c1.insert(Mymap::make_value(L'a', 1)); c1.insert(Mymap::make_value(L'b', 2)); c1.insert(Mymap::make_value(L'c', 3)); // disp...
// cliext_map_clear.cpp // compile with: /clr #include <cliext/map> typedef cliext::map<wchar_t, int> Mymap; int main() { Mymap c1; c1.insert(Mymap::make_value(L'a', 1)); c1.insert(Mymap::make_value(L'b', 2)); c1.insert(Mymap::make_value(L'c', 3)); // disp...
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PeopleMap.clear()清空所有元素 可以直接进行赋值和比较:=,>,>=,<,<=,!=等等 #include <iostream> #include <string> #include <map> typedef std::map<int , std::string> mapPeopleType; void for_each(mapPeopleType &PeopleMap) { mapPeopleType::iterator itr = PeopleMap.begin(); ...
time>=clear_interval_seconds){setup_log_directory(log_directory);//--每次删除前，都先创建一个测试数据next_clear_time=current_time()+clear_interval_seconds;pool.enqueue(TimeEvent(next_clear_time,clear_logs_task));std::cout<<"达到填充任务间隔时间，往定时任务中增加任务:next_clear_time="<<next...
// map_clear.cpp // compile with: /EHsc #include <map> #include <iostream> int main() { using namespace std; map<int, int> m1; map<int, int>::size_type i; typedef pair<int, int> Int_Pair; m1.insert(Int_Pair(1, 1)); m1.insert(Int_Pair(2, 4)); i = m1.size(); cou...