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#include <iostream>
#include <vector>
#include <array>
#include <cstdint>
#include <limits>
#include <algorithm>
#include <limits>
#include <optional>
std::array<std::optional<std::uint32_t>, 5> elem_arr;
void copy_from_vector(std::vector<std::uint32_t> elem_vec)
{
std::transform( elem_vec.begin() , elem_vec.end() ,
elem_arr.begin() ,
[]( auto val ) { return std::optional<std::uint32_t>{ val }; }
);
}
std::vector<std::uint32_t> copy_from_array()
{
std::vector<std::uint32_t> ele_vec_copy;
std::vector<std::optional<std::uint32_t>> non_null_elements;
std::copy_if( elem_arr.begin() , elem_arr.end() ,
std::back_inserter( non_null_elements ) ,
[]( auto val ) {
return val;
} );
std::transform( non_null_elements.begin(), non_null_elements.end() ,
std::back_inserter( ele_vec_copy ) ,
[]( auto val ) { return *val; }
);
return ele_vec_copy;
}
int main()
{
std::vector<std::uint32_t> ele_vec {1,2,3};
copy_from_vector(ele_vec);
auto ele_vec_copy = copy_from_array();
for(auto ele : ele_vec_copy)
std::cout << ele << std::endl;
return 0;
}
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