};
-/// sigmoid(t, x0, y0, C, P, Q) implements a sigmoid-like function using only integers,
-/// with the following properties:
-///
-/// - sigmoid is centered in (x0, y0)
-/// - sigmoid has amplitude [-P/Q , P/Q] instead of [-1 , +1]
-/// - limit is (y0 - P/Q) when t tends to -infinity
-/// - limit is (y0 + P/Q) when t tends to +infinity
-/// - the slope can be adjusted using C > 0, smaller C giving a steeper sigmoid
-/// - the slope of the sigmoid when t = x0 is P/(Q*C)
-/// - sigmoid is increasing with t when P > 0 and Q > 0
-/// - to get a decreasing sigmoid, change sign of P
-/// - mean value of the sigmoid is y0
-///
-/// Use <https://www.desmos.com/calculator/jhh83sqq92> to draw the sigmoid
-
-inline int64_t sigmoid(int64_t t, int64_t x0,
- int64_t y0,
- int64_t C,
- int64_t P,
- int64_t Q)
-{
- assert(C > 0);
- assert(Q != 0);
- return y0 + P * (t-x0) / (Q * (std::abs(t-x0) + C)) ;
-}
-
-
/// xorshift64star Pseudo-Random Number Generator
/// This class is based on original code written and dedicated
/// to the public domain by Sebastiano Vigna (2014).