grove_iterate.sol

import "libraries/GroveLib.sol";
import "libraries/StringUtils.sol";


contract IterableStruct {
        GroveLib.Index theIndex;

        uint _id;

        struct MyStruct {
                uint id;
                bytes32 value;
        }

        mapping (int => MyStruct) my_structs;

        function addThing(bytes32 value) {
                _id++;
                var thing = my_structs[_id];
                thing.id = _id;
                thing.value = value;

                GroveLib.insert(theIndex, StringUtils.uintToBytes(uint(thing.id)), int(thing.id));
        }

        function iterateOverThings() {
                bytes32 id = GroveLib.query(theIndex, ">=", 0);

                while (id != 0x0) {
                        thing = my_structs[StringUtils.bytesToUint(id)];
                        // do something with the thing?
                        id = Grove.getNextNode(id);
                }
        }
}