std_vector.hpp

#pragma once
#include <vector>
 
// TODO(https://github.com/AztecProtocol/barretenberg/issues/794) namespace this once convenient
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;
}