Value precedence constraints over integer variables
[Using integer variables and constraints]

Functions
void	Gecode::precede (Home home, const IntVarArgs &x, int s, int t, IntPropLevel=IPL_DEF)
	Post propagator that s precedes t in x.
void	Gecode::precede (Home home, const IntVarArgs &x, const IntArgs &c, IntPropLevel=IPL_DEF)
	Post propagator that successive values in c precede each other in x.

Function Documentation

Post propagator that s precedes t in x.

This constraint enforces that $x_0\neq t$ and $x_j=t \to \bigvee_{0\leq i<j} x_i=s$ for $0\leq j<|x|$ . The propagator is domain consistent.

Post propagator that successive values in c precede each other in x.

This constraint enforces that $x_0\neq c_k$ for $0<k<|c|$ and $x_j=c_{k} \to \bigvee_{0\leq i<j} x_i=c_{k-1}$ for $0\leq j<|x|$ and $0< k<|c|$ .