negate Struct

结构提供了返回元素值的负值的预定义的函数对象。

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

参数

• _Left
  负将返回元素的值。

返回值

参数值的负:- _Left.

示例

// 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;
}

要求

标头: <functional>

命名空间: std

请参见

参考

线程安全性对标准C++库中

标准模板库