static bool move(Grid &grid, Dynamics::MoveStats &stats) {
bool anyChange = false;
ITERATOR iterator;
do {
ITERATOR begin(iterator);
while (iterator.increment()) {
while (begin != iterator) {
auto source = grid.get(*iterator);
if (source == 0u)
break;
auto destination = grid.get(*begin);
if (destination == 0u) {
// Move source to destination.
grid.set(*begin, source);
grid.set(*iterator, 0u);
anyChange = true;
break;
} else if (destination == source) {
// Merge.
const size_t mergedValue = 2u * source;
grid.set(*begin, mergedValue);
grid.set(*iterator, 0u);
begin.increment();
stats.score += mergedValue;
if (mergedValue > stats.higherMergedValue)
stats.higherMergedValue = mergedValue;
anyChange = true;
break;
} else {
begin.increment();
}
}
}
} while (iterator.jump());
return anyChange;
}
