multiset::const_reference

提供对 const 元素的类型在读取和执行的操作 const 多个集存储状态。

typedef typename allocator_type::const_reference const_reference;

示例

// multiset_const_ref.cpp
// compile with: /EHsc
#include <set>
#include <iostream>

int main( )
{
   using namespace std;
   multiset <int> ms1;

   ms1.insert( 10 );
   ms1.insert( 20 );

   // Declare and initialize a const_reference &Ref1 
   // to the 1st element
   const int &Ref1 = *ms1.begin( );

   cout << "The first element in the multiset is "
        << Ref1 << "." << endl;

   // The following line would cause an error because the 
   // const_reference cannot be used to modify the multiset
   // Ref1 = Ref1 + 5;
}

要求

标头: <set>

命名空间: std

请参见

参考

multiset Class

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