std :: transform如何不返回（也不抛出），只是跳过？

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

bool is_even(int n) {
    return n % 2 == 0;
}

int main() {
    std::vector<int> input = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    std::vector<int> output;

    std::remove_copy_if(input.begin(), input.end(), std::back_inserter(output), is_even);

    std::cout << "Output: ";
    for (int n : output) {
        std::cout << n << " ";
    }
    std::cout<< std::endl;

    return 0;
}