negate Struct
The struct provides a predefined function object that returns the negative of an element value.
template<class Type>
struct negate : public unary_function<Type, Type>
{
Type operator()(
const Type& _Left
) const;
};
Parameters
- _Left
The value of an element whose negative is to be returned.
Return Value
The negative of the parameter value: - _Left.
Example
// 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;
}
The vector v1 = ( -10 -5 0 5 10 15 20 25 )
The negated elements of the vector = ( 10 5 0 -5 -10 -15 -20 -25 )
Requirements
Header: <functional>
Namespace: std