multimap::upper_bound

傳回 Iterator 至具有索引鍵所指定的索引鍵大 multimap 的第一個項目。

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

參數

• _Key
  引數的索引鍵使用一個項目來排序鍵來比較要搜尋的 multimap 的。

傳回值

處理一個項目位置 multimap 具有索引鍵的引數索引鍵大於的 Iterator 或 const_iterator 或解決成功最後一個項目的位置在 multimap，如果符合沒有索引鍵中找到。

如果的傳回值指派給 const_iterator，無法修改 multimap 物件。 如果的傳回值指派給 iterator，可以修改 multimap 物件。

範例

// 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;
}

需求

標題: <map>

命名空間: std

請參閱

參考

multimap Class

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