965dadaa
 Salvador Abreu
initial commit fr...
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/* maximisation */
#include "bound.h"
static int fd_max_filter(fd_constraint this)
{
fd_int x = VAR(this, 0);
if (_fd_var_del_le(_fd_bound_value(), x))
{
if (fd_domain_empty(x))
return FD_NOSOLUTION;
_fd_revise_connected(this, x);
}
return FD_OK;
}
int fd_max_propagate2(fd_constraint this, fd_int culprit)
{
int changed = 0;
changed = _fd_var_del_le(_fd_bound_value(), culprit);
if (changed)
{
if (fd_domain_empty(culprit))
return FD_NOSOLUTION;
_fd_revise_connected(this, culprit); // XXX
}
return FD_OK;
}
#ifndef USE_STORE
#error "fd_max requires USE_STORE"
#endif
int fd_max_satisfied(fd_constraint this, _fd_store store, int *value)
{
int v;
// XXX: `store' appears in the expansion of DOMAIN()
_fd_val_single(DOMAIN(VAR(this, 0)), &v);
if (value)
*value = v;
return v > _fd_bound_value();
}
int fd_max_valid_bound(int current, int new)
{
return new > current;
}
int fd_max_compare(fd_constraint this, _fd_store s1, _fd_store s2)
{
int v1, v2;
// XXX: `store' appears in the expansion of DOMAIN()
{
_fd_store store = s1;
_fd_val_single(DOMAIN(VAR(this, 0)), &v1);
}
{
_fd_store store = s2;
_fd_val_single(DOMAIN(VAR(this, 0)), &v2);
}
return v2 - v1;
}
bool fd_max_bound_variable(fd_constraint this, int bound)
{
return _fd_var_del_le(bound, VAR(this, 0)) != 0;
}
fd_constraint fd_max(fd_int variable)
{
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965dadaa
Salvador Abreu
initial commit fr...
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#else /* CONSTRAINT_CLASS */
c->propagator2 = fd_max_propagate2;
#endif /* CONSTRAINT_CLASS */
_fd_var_add_constraint(variable, c);
_fd_add_constraint(c);
}
_fd_init_bound(MIN_VALUE - 1, FD_INT2C_VAR(variable), c, fd_max_satisfied,
fd_max_valid_bound, fd_max_compare, fd_max_bound_variable);
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Update to PaCCS v...