template<
    std::size_t N,
    typename CharT,
    typename Traits>
constexpr void
swap(
    basic_static_string< N, CharT, Traits >& lhs,
    basic_static_string< N, CharT, Traits >& rhs);
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template<
    std::size_t N,
    std::size_t M,
    typename CharT,
    typename Traits>
constexpr void
swap(
    basic_static_string< N, CharT, Traits >& lhs,
    basic_static_string< M, CharT, Traits >& rhs);
  » more...