std_vector.hpp

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#pragma once
#include <vector>
 
namespace bb {
template <typename T> std::vector<T> concatenate(const std::vector<T>& vector, const auto&... vectors)
{
    std::vector<T> concatenated;
    // Reserve our final space
    concatenated.reserve(vector.size() + (vectors.size() + ...));
 
    auto append = [&](const auto& vec) { std::copy(vec.begin(), vec.end(), std::back_inserter(concatenated)); };
 
    append(vector);
    // Unpack and append each std::vector's elements to concatenated
    (append(vectors), ...);
 
    return concatenated;
}
} // namespace bb