not2 函式

傳回二元述詞的補充。

template<class BinaryPredicate> 
   binary_negate<BinaryPredicate> not2( 
      const BinaryPredicate& _Func 
   );

參數

• _Func
  要變成相反值的二進位述詞。

傳回值

已修改之二進位述詞否定的二進位述詞。

備註

如果 binary_negate 從二進位述詞 BinPred(x， y)，則它會建構傳回! BinPred(x， y)。

範例

// functional_not2.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <functional>
#include <cstdlib>
#include <iostream>

int main( )
{
   using namespace std;
   vector <int> v1;
   vector <int>::iterator Iter1;

   int i;
   v1.push_back( 6262 );
   v1.push_back( 6262 );
   for ( i = 0 ; i < 5 ; i++ )
   {
      v1.push_back( rand( ) );
   }

   cout << "Original vector v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")" << endl;

   // To sort in ascending order,
   // use default binary predicate less<int>( )
   sort( v1.begin( ), v1.end( ) );
   cout << "Sorted vector v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")" << endl;

   // To sort in descending order, 
   // use the binary_negate helper function not2
   sort( v1.begin( ), v1.end( ), not2(less<int>( ) ) );
   cout << "Resorted vector v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")" << endl;
}

需求

標題: <functional>

命名空間: std

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參考

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