snippets

#include <algorithm>
#include <vector>

std::vector<int> filterEvens(const std::vector<int>& v) {
    std::vector<int> result;
    std::copy_if(v.begin(), v.end(),
        std::back_inserter(result),
        [](int x) { return x % 2 == 0; });
    return result;
}