#include <fmt/core.h>

#include <algorithm>
#include <array>
#include <cstddef>
#include <string>

template <std::size_t Size>
constexpr auto to_array(const std::string& str)
{
    std::array<char, Size> result;
    std::copy(str.begin(), str.end(), result.begin());
    return result;
}

template <auto Data>
inline constexpr std::string_view STATIC_STRING_VIEW{Data.data(), Data.size()};

consteval auto to_string_view(const auto callable)
{
    return STATIC_STRING_VIEW<to_array<callable().size()>(callable())>;
}

int main()
{
    static constexpr auto TEST = to_string_view(
        []
        {
            return std::string{"test"};
        });
    fmt::print("{}", TEST);
}

  [[nodiscard]] constexpr value_type &at(const std::size_t idx)
  {
    if (idx > size_) { throw std::out_of_range("index past end of stack_vector"); }
    return data_[idx];
  }


  [[nodiscard]] constexpr const value_type &at(const std::size_t idx) const
  {
    if (idx > size_) { throw std::out_of_range("index past end of stack_vector"); }
    return data_[idx];
  }