not1 Function
Returns the complement of a unary predicate.
template<class UnaryPredicate>
unary_negate<UnaryPredicate> not1(
const UnaryPredicate& _Pred
);
Parameters
- _Pred
The unary predicate to be negated.
Return Value
A unary predicate that is the negation of the unary predicate modified.
Remarks
If a unary_negate is constructed from a unary predicate Pred(x), then it returns ! Pred(x).
Example
// functional_not1.cpp
// compile with: /EHsc
#include <vector>
#include <functional>
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
vector<int> v1;
vector<int>::iterator Iter;
int i;
for (i = 0; i <= 7; i++)
{
v1.push_back(5 * i);
}
cout << "The vector v1 = ( ";
for (Iter = v1.begin(); Iter != v1.end(); Iter++)
cout << *Iter << " ";
cout << ")" << endl;
vector<int>::iterator::difference_type result1;
// Count the elements greater than 10
result1 = count_if(v1.begin(), v1.end(), bind2nd(greater<int>(), 10));
cout << "The number of elements in v1 greater than 10 is: "
<< result1 << "." << endl;
vector<int>::iterator::difference_type result2;
// Use the negator to count the elements less than or equal to 10
result2 = count_if(v1.begin(), v1.end(),
not1(bind2nd(greater<int>(), 10)));
cout << "The number of elements in v1 not greater than 10 is: "
<< result2 << "." << endl;
}
The vector v1 = ( 0 5 10 15 20 25 30 35 ) The number of elements in v1 greater than 10 is: 5. The number of elements in v1 not greater than 10 is: 3.
Requirements
Header: <functional>
Namespace: std