boost::algorithm::none_of_equal() in C++ library
Last Updated :
30 May, 2019
The none_of_equal() function in C++ boost library is found under the header ‘boost/algorithm/cxx11/none_of.hpp‘ which tests all the elements of a sequence against the value passed in the parameter and returns true if all the elements of the sequence are not equal to the value passed. It takes a sequence and a value, and returns true if none of the elements are equal to the value in the sequence.
Syntax:
bool none_of_equal ( InputIterator first, InputIterator last, const &value)
or
bool none_of_equal ( const Range &R, const &value)
Parameters: The function accepts parameters as described below:
- first: It specifies the input iterators to the initial positions in a sequence.
- second: It specifies the input iterators to the final positions in a sequence.
- value: It specifies a value which is to be checked against for none the elements of the sequence.
- R: It is the complete sequence.
Return Value: The function returns true if none of the elements of the sequence is equal to value, else it returns false.
Below is the implementation of the above approach:
Program-1:
#include <bits/stdc++.h>
#include <boost/algorithm/cxx11/none_of.hpp>
using namespace std;
int main()
{
vector< int > c(5, 1);
bool ans
= boost::algorithm::none_of_equal(c, 1);
if (ans == 1)
cout << "all not equal to 1" ;
else
cout << "all equals to 1" ;
return 0;
}
|
Program-2:
#include <bits/stdc++.h>
#include <boost/algorithm/cxx11/none_of.hpp>
using namespace std;
int main()
{
int a[] = { 1, 2, 5, 6 };
bool ans
= boost::algorithm::none_of_equal(a, a + 4, 4);
if (ans == 1)
cout << "all not equal to 4" ;
else
cout << "all equal to 4" ;
return 0;
}
|
Output:
all not equal to 4
Reference: https://www.boost.org/doc/libs/1_70_0/libs/algorithm/doc/html/the_boost_algorithm_library/CXX11/none_of.html
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