michael@0: // Multiple live iterators on the same Set can cope with removing entries.
michael@0: 
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: // Make a set.
michael@0: var set = Set();
michael@0: var SIZE = 7;
michael@0: for (var j = 0; j < SIZE; j++)
michael@0:     set.add(j);
michael@0: 
michael@0: // Make lots of iterators pointing to entry 2 of the set.
michael@0: var NITERS = 5;
michael@0: var iters = [];
michael@0: for (var i = 0; i < NITERS; i++) {
michael@0:     var iter = set[std_iterator]();
michael@0:     assertIteratorNext(iter, 0);
michael@0:     assertIteratorNext(iter, 1);
michael@0:     iters[i] = iter;
michael@0: }
michael@0: 
michael@0: // Remove half of the set entries.
michael@0: for (var j = 0; j < SIZE; j += 2)
michael@0:     set.delete(j);
michael@0: 
michael@0: // Make sure all the iterators still work.
michael@0: for (var i = 0; i < NITERS; i++) {
michael@0:     var iter = iters[i];
michael@0:     for (var j = 3; j < SIZE; j += 2)
michael@0:         assertIteratorNext(iter, j);
michael@0:     assertIteratorDone(iter, undefined);
michael@0: }