Stream insertion operators
<mp-units/cartesian_vector.h>Stream insertion operator
std::basic_ostream<CharT>&
operator<<(
    std::basic_ostream<CharT>& os,
    basic_fixed_string const& str);
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Stream insertion operator
constexpr
std::ostream&
operator<<(
    std::ostream& os,
    cartesian_vector const& vec);
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Stream insertion operator
template<
    typename CharT,
    typename Traits,
    Unit D>
std::basic_ostream<CharT, Traits>&
operator<<(
    std::basic_ostream<CharT, Traits>& os,
    D d);
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Stream insertion operator
template<
    typename CharT,
    typename Traits,
    auto R,
    typename Rep>
std::basic_ostream<CharT, Traits>&
operator<<(
    std::basic_ostream<CharT, Traits>& os,
    quantity<R, Rep> const& q)
requires requires { os << q.numerical_value_ref_in(q.unit); };
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