std_array.hpp

#pragma once
 
#include <array>
 
// TODO(https://github.com/AztecProtocol/barretenberg/issues/794) namespace this once convenient
template <typename T, std::size_t... Ns> std::array<T, (Ns + ...)> concatenate(const std::array<T, Ns>&... arrays)
{
    std::array<T, (Ns + ...)> result;
 
    std::size_t offset = 0;
    auto copy_into = [&](const auto& array) {
        std::copy(array.begin(), array.end(), result.begin() + offset);
        offset += array.size();
    };
 
    (copy_into(arrays), ...);
 
    return result;
}