What value does the std::find_if function return if the searched element is not found in the container?

The std::find_if function returns an iterator to the first element in the range for which the predicate returns true. If no such element is found, the function returns an iterator equal to the end iterator (usually v.end() of the container).

Example:

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> v = {1, 3, 5, 7};
    auto it = std::find_if(v.begin(), v.end(), [](int x) { return x > 5; });
    if (it != v.end()) {
        std::cout << "Found element: " << *it << std::endl;
    } else {
        std::cout << "Element not found" << std::endl;
    }
    return 0;
}

If the element is not found, the iterator will be equal to v.end().