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partition_point in C++
In this tutorial, we will be discussing a program to understand partition_point in C++.
Partition point is a method which returns an iterator pointing to the first value in a given range. The range is a partitioned one in which the predicate is not true.
Example
#include <iostream>
#include <algorithm>
#include <vector>
bool IsOdd(int i) { return (i % 2) == 1; }
int main(){
std::vector<int> data{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
std::vector<int> odd, even;
std::stable_partition(data.begin(), data.end(), IsOdd);
auto it = std::partition_point(data.begin(), data.end(),
IsOdd);
odd.assign(data.begin(), it);
even.assign(it, data.end());
std::cout << "odd:";
for (int& x : odd)
std::cout << ' ' << x;
std::cout << '\n';
std::cout << "even:";
for (int& x : even)
std::cout << ' ' << x;
std::cout << '\n';
return 0;
}Output
odd: 1 3 5 7 9 even: 2 4 6 8 10
Updated on: 14-Apr-2020
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