#include <XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX>

template<XXXXXXXXXXXXXXXXXXXXXXXXXX>
XXXXXXXXX
XXXX<X, X, XXXXXXXX>::XXXX()
{
  xxxxxx(xxxx, 0, xxxxxx (*xxxx));
}

xxxxxxxx<xxxxxxxx x, xxxx x, xxxx xxxxxxxx>
xxxxx<x, x, xxxxxxxx>&
xxxxx<x, x, xxxxxxxx>::xxxxxxxx=(xxx::xxxxxxxxxxx_xxxx<xxxxx_xxxx> xx)
{
  xxxxxx *xxxx = xxxxx(xxx::xxxx(xx));
}

xxxxxxxx<xxxxxxxx x, xxxx x, xxxx xxxxxxxx>
xxxx
xxxxx<x, x, xxxxxxxx>::xxxx_xxxx(xxxx_x xxxx_xxx, xxxx_x xxxx_xx)
    xxxxxxxx
{
  xxxx_x xx = xxxx->xxxx();
  xxxx_xxx_xxxxxx(xxxx->xxxxxxxx() >= xx + xxxx_xx);
  xxxx_xxx_xxxxxx(xxxx_xxx <= xx);
  xx (xxxx_xxx < xx && xxxx_xx) {
    x* xxxx = xxxx->xxxx();
    xxx (xxxx_x xxx = xx + xxxx_xx - 1; xxx >= xxxx_xxx; --xxx) {
      xx (xxx >= xx)
        xxx (xxxx[xxx]) x(xxx::xxxx(xxxx[xxx - xxxx_xx]));
      xxxx xx (xxx >= xxxx_xxx + xxxx_xx)
        xxxx[xxx] = xxx::xxxx(xxxx[xxx - xxxx_xx]);
      xxxx
        xxxx[xxx].~x();
    }
  }
}

xxxxxxxx<xxxxxxxx x, xxxx x, xxxx xxxxxxxx>
xxxx
xxxxx<x, x, xxxxxxxx>::xxxxx_xxxx(xxxx_x xxxx_xxx,
                                  xxxx_x xxxx_xx,
                                  xxxx_x xx_xxxxxxxxxxx)
    xxxxxxxx
{
  xx (!xxxx_xx)
    xxxxxx;
  xxxx_x xx = xxxx->xxxx();
  xxxx_xxx_xxxxxx(xx_xxxxxxxxxxx <= xxxx_xx);
  xxxx_xxx_xxxxxx(xxxx_xxx <= xx);
  x* xxxx = xxxx->xxxx();
  xxx (xxxx_x xxx = xxxx_xxx; xxx < xx + xxxx_xx; ++xxx) {
    xx (xxx < xxxx_xxx + xx_xxxxxxxxxxx) {
      // xx xxx xxxx xxxx xxx xxxxxxxx xx'xx xxxxxxxxxxxx xxxxxxxxxxx.
      xxxx[xxx] = xxx::xxxx(xxxx[xxx + xxxx_xx]);
    } xxxx xx (xxx < xxxx_xxx + xxxx_xx) {
      // xxxx xxxxxxx xxxx'x xxxxxxxxxx xxxxxxxxxxx, xx xxxxxxxxx-xxx
      // xxxx xxxx xx xxxxxxx.
      xxx (&xxxx[xxx]) x(xxx::xxxx(xxxx[xxx + xxxx_xx]));
    } xxxx xx (xxx < xx) {
      // xxxx xx xxx xxxxxxx xxxxxxxx
      xxxx[xxx] = xxx::xxxx(xxxx[xxx + xxxx_xx]);
    } xxxx {
      // xxxxxxxx xxx xxxx xxx xxx: xxxxxxx xxxx
      xxxx[xxx].~x();
    }
  }
}

xxxxxxxx<xxxxxxxx x, xxxx x, xxxx xxxxxxxx>
xxxxxxxx<xxxxxxxx... xxxx>
xxxxxxxx xxxxx<x, x, xxxxxxxx>::xxxxxxxx
xxxxx<x, x, xxxxxxxx>::xxxxxxx(xxxxx_xxxxxxxx x, xxxx&&... xxxx)
{
  // xxxx xxx xxxxx: xxxxxxxx xxxxxxxxxxx xxxxx.
  xxxx_x xxx = xxx::xxxxxxxx(xxxx->xxxxxx(), x);
  xxxx_x xx = xxxx->xxxx();

  // xxxx xxxx xx xxx xxxxx xx xxx xxxxx xxx xxxx xx xxxx xxxx.
  xxxx->xxxx(1);
  xxxx->xxxx_xxxx(xxx, 1);

  // xxxxxxx xxx xxxxxx xxxxxxxxx xxxxxxxxx
  xxxx xxxxxxx = xxxxx;
  xxxx xxxxx = xxxxxxxx::xxxxxxxxxx([&]{
    xx (!xxxxxxx)
      xxxx->xxxxx_xxxx(xxx, 1, 0);
  });
  xxx (&xxxx->xxxx()[xxx])(xxx::xxxxxxx<xxxx>(xxxx)...);
  xxxxxxx = xxxx;
  xxxx_xxx_xxxxx_xxx_xxxx(&xxxx->xxxxx, &xxxxx::xxxx, xx + 1);
}