void Concat::evaluateGen(const MatV& input, MatV& output, std::vector<int>& itmp,
std::vector<T>& rtmp) {
typename vector<T>::iterator res_it = output[0]->data().begin();
for (int i=0; i<input.size(); ++i) {
const vector<T>& arg_i = input[i]->data();
copy(arg_i.begin(), arg_i.end(), res_it);
res_it += arg_i.size();
}
}
