mp_units::utility::operator+

[[nodiscard]]
constexpr
constrained<decltype(+std::declval<T>()), ErrorPolicy>
operator+(constrained const& x);

[[nodiscard]]
constexpr
safe_int<detail::integral_op_result_t<U, T>, ErrorPolicy>
operator+(
    U lhs,
    safe_int rhs);

[[nodiscard]]
constexpr
auto
operator+(
    U lhs,
    safe_int rhs)
requires requires { lhs + static_cast<U>(rhs.value_); };

[[nodiscard]]
constexpr
safe_int<detail::integral_op_result_t<T, U>, ErrorPolicy>
operator+(
    safe_int lhs,
    U rhs);

[[nodiscard]]
constexpr
auto
operator+(
    safe_int lhs,
    U rhs)
requires requires { static_cast<U>(lhs.value_) + rhs; };

[[nodiscard]]
constexpr
safe_int<detail::integral_op_result_t<T, T>, ErrorPolicy>
operator+(
    safe_int lhs,
    safe_int rhs);

[[nodiscard]]
constexpr
safe_int<detail::integral_op_result_t<T, U>, ErrorPolicy>
operator+(
    safe_int lhs,
    constrained<U, CP> rhs);

[[nodiscard]]
constexpr
constrained<decltype(std::declval<T>() + std::declval<U>()), CP>
operator+(
    safe_int lhs,
    constrained<U, CP> const& rhs);

[[nodiscard]]
constexpr
safe_int<detail::integral_op_result_t<U, T>, ErrorPolicy>
operator+(
    constrained<U, CP> lhs,
    safe_int rhs);

[[nodiscard]]
constexpr
constrained<decltype(std::declval<U>() + std::declval<T>()), CP>
operator+(
    constrained<U, CP> const& lhs,
    safe_int rhs);