Function isspace

gil/std.io.hpp:29–33

} // namespace _impl_

static constexpr auto isspace(auto ch) noexcept {
  using _impl_::tmp;
  return block_(tmp = ch, break_(tmp == ' ' || tmp == '\t' || tmp == '\n' ||
                                 tmp == '\v' || tmp == '\f' || tmp == '\r'));
}

static constexpr auto skip_whitespace() noexcept {
  return loop_(if_(isspace(peek_()))(advance_())->else_(break_));