Contract

Contract Source Code (Solidity)

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Outline

• library IdToAddressBiMap
•    - function hasId(Data storage self, uin ...
•    - function hasAddress(Data storage self ...
•    - function getAddressAt(Data storage se ...
•    - function getId(Data storage self, add ...
•    - function insert(Data storage self, ui ...

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/**
 *Submitted for verification at Etherscan.io on 2020-01-22
*/

pragma solidity ^0.5.0;


library IdToAddressBiMap {
    struct Data {
        mapping(uint16 => address) idToAddress;
        mapping(address => uint16) addressToId;
    }

    function hasId(Data storage self, uint16 id) public view returns (bool) {
        return self.idToAddress[id + 1] != address(0);
    }

    function hasAddress(Data storage self, address addr) public view returns (bool) {
        return self.addressToId[addr] != 0;
    }

    function getAddressAt(Data storage self, uint16 id) public view returns (address) {
        require(hasId(self, id), "Must have ID to get Address");
        return self.idToAddress[id + 1];
    }

    function getId(Data storage self, address addr) public view returns (uint16) {
        require(hasAddress(self, addr), "Must have Address to get ID");
        return self.addressToId[addr] - 1;
    }

    function insert(Data storage self, uint16 id, address addr) public returns (bool) {
        require(addr != address(0), "Cannot insert zero address");
        require(id != uint16(-1), "Cannot insert max uint16");
        // Ensure bijectivity of the mappings
        if (self.addressToId[addr] != 0 || self.idToAddress[id + 1] != address(0)) {
            return false;
        }
        self.idToAddress[id + 1] = addr;
        self.addressToId[addr] = id + 1;
        return true;
    }

}

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bzzr://aebf624c79b17fd0232761c3f186dedc347cbdb7d0c6cff33b05eba89a3ea4a2