G<F> _NOT_( F f );

where :

• F is the type of functor f
• G is the type of resulting functor

A functor of type G<F>

Creates a functor that returns the negation of f result.

#include <iostream>
#include <vector>
#include "sftl.h"
 
using namespace std;
 
bool dividable_by_2( int x ) {
    return (x%2)==0;
}
 
int main() {
 
    // create vector of numbers
    int numbers [] = {1,2,3,4,5,6,7,8,9};
    vector<int> v_numbers( &numbers[0], &numbers[9] );
 
    // extract the numbers non dividable by 2
    vector<int> v = filter( v_numbers, _NOT_(dividable_by_2) ); // v contains 1 3 5 7 9
}