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std::copy_if sample
std::vector<int> xs = { 1, 2, 3, 4, 5, 6, 7, 8 }, ys;
ys.resize(xs.size() / 2);
auto is_odd = [](int i) {
return (i & 0x1) == 0x1;
};
std::copy_if(xs.begin(), xs.end(), ys.begin(), is_odd); //ys = 1, 3, 5, 7
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