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  // ==のdefault定義の展開
  bool operator==(const C&) const {
    if (bool cmp = n == that.n; cmp) return cmp;
    if (bool cmp = d == that.d; cmp) return cmp;
    if (bool cmp = str[0] == that.str[0]; cmp) return cmp;
    if (bool cmp = str[1] == that.str[1]; cmp) return cmp;
    return str[2] == that.str[2];
  }

  // ただし前にある要素の初期化子を省略できない
  point3d v5 = { .Y = 1.0 };            // エラー