multimap::upper_bound

返回迭代器在带有密钥大于指定的键的高 multimap 的第一个元素。

iterator upper_bound( 
   const Key& _Key 
); 
const_iterator upper_bound( 
   const Key& _Key 
) const;

参数

• _Key
  参数用键元素的排序关键字进行比较从搜索的 multimap 的。

返回值

解决一个元素在 multimap 位置与键与参数大于键的迭代器或 const_iterator ) 最后一个元素成功解决的位置。multimap，如果与对于找到键。

如果返回值为 const_iterator，则不能修改 multimap 对象。 如果返回值赋给 迭代器，可以修改 multimap 对象。

示例

// multimap_upper_bound.cpp
// compile with: /EHsc
#include <map>
#include <iostream>

int main( )
{
   using namespace std;
   multimap <int, int> m1;
   multimap <int, int> :: const_iterator m1_AcIter, m1_RcIter;
   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.insert ( Int_Pair ( 3, 40 ) );

   m1_RcIter = m1.upper_bound( 1 );
   cout << "The 1st element of multimap m1 with "
        << "a key greater than 1 is: "
        << m1_RcIter -> second << "." << endl;

   m1_RcIter = m1.upper_bound( 2 );
   cout << "The first element of multimap m1 with a key "
        << " greater than 2 is: "
        << m1_RcIter -> second << "." << endl;

   // If no match is found for the key, end( ) is returned
   m1_RcIter = m1.lower_bound( 4 );

   if ( m1_RcIter == m1.end( ) )
      cout << "The multimap m1 doesn't have an element "
           << "with a key of 4." << endl;
   else
      cout << "The element of multimap m1 with a key of 4 is: "
           << m1_RcIter -> second << "." << endl;

   // The element at a specific location in the multimap can be
   // found using a derefenced iterator addressing the location
   m1_AcIter = m1.begin( );
   m1_RcIter = m1.upper_bound( m1_AcIter -> first );
   cout << "The first element of m1 with a key greater than\n"
        << "that of the initial element of m1 is: "
        << m1_RcIter -> second << "." << endl;
}

要求

标头: <map>

命名空间: std

请参见

参考

multimap 类

标准模板库