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December 27, 2015 13:29
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// ループ用変数を定義 | |
size_t n = end - begin; | |
size_t s = v.size(); // vは、メンバ変数として保持される、`vector<result_type>`型のシード列オブジェクト | |
auto m = max(s + 1, n); | |
// 分布用変数を定義 | |
auto t = (n >= 623) ? 11 : (n >= 68) ? 7 : (n >= 39) ? 5 : (n >= 7) ? 3 : (n - 1) / 2; | |
auto p = (n - t) / 2; | |
auto q = p + t; | |
// 一度目の分布 | |
for (size_t k = s + 1; k < m; ++k) { | |
auto r1 = 1664525 * T(begin[k%n] ^ begin[(k+p)%n] ^ begin[(k-1)%n]); | |
auto r2 = r1 + | |
( k == 0 ? s | |
: (0 < k) && (k <= s) ? (k%n + v[k-1]) | |
: /*k > s ?*/ k%n | |
); | |
begin[(k+p)%n] += r1; | |
begin[(k+q)%n] += r2; | |
begin[k%n] = r2; | |
} | |
// 二度目の分布 | |
for (size_t k = m; k < m + n; ++k) { | |
auto r3 = 1566083941 * T(begin[k%n] + begin[(k+p)%n] + begin[(k-1)%n]); | |
auto r4 = r3 - k%n; | |
begin[(k+p)%n] ^= r3; | |
begin[(k+q)%n] ^= r4; | |
begin[k%n] = r4; | |
} |
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