negate Struct

結構提供傳回項目值的負數的預先定義的函式物件。

template<class Type>
   struct negate : public unary_function<Type, Type> 
   {
      Type operator()(
         const Type& _Left
      ) const;
   };

參數

• _Left
  負要傳回項目的值。

傳回值

參數值的負數:- _Left.

範例

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

using namespace std;

int main( )
{
   vector <int> v1, v2 ( 8 );
   vector <int>::iterator Iter1, Iter2;
   
   int i;
   for ( i = -2 ; i <= 5 ; i++ )
   {
      v1.push_back( 5 * i );
   }

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

   // Finding the element-wise negatives of the vector v1
   transform ( v1.begin( ),  v1.end( ), v2.begin( ), negate<int>( ) );

   cout << "The negated elements of the vector = ( " ;
   for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
      cout << *Iter2 << " ";
   cout << ")" << endl;
}

需求

標題: <functional>

命名空間: std

請參閱

參考

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