map::end
返回通过这就结束迭代器。
const_iterator end( ) const;
iterator end( );
返回值
通过这就结束迭代器。 如果映射为空,然后 map::end() == map::begin()。
备注
结束 用于测试迭代器是否已超过其映射的末尾。
不应取消引用 结束 返回的值。
示例
// map_end.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
map <int, int> m1;
map <int, int> :: iterator m1_Iter;
map <int, int> :: const_iterator m1_cIter;
typedef pair <int, int> Int_Pair;
m1.insert ( Int_Pair ( 1, 10 ) );
m1.insert ( Int_Pair ( 2, 20 ) );
m1.insert ( Int_Pair ( 3, 30 ) );
m1_cIter = m1.end( );
m1_cIter--;
cout << "The value of the last element of m1 is:\n"
<< m1_cIter -> second << endl;
m1_Iter = m1.end( );
m1_Iter--;
m1.erase ( m1_Iter );
// The following 2 lines would err because the iterator is const
// m1_cIter = m1.end ( );
// m1_cIter--;
// m1.erase ( m1_cIter );
m1_cIter = m1.end( );
m1_cIter--;
cout << "The value of the last element of m1 is now:\n"
<< m1_cIter -> second << endl;
}
要求
标头: <map>
命名空间: std