Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.8.0;
contract DelegateRegistry {
    
    // The first key is the delegator and the second key a id. 
    // The value is the address of the delegate 
    mapping (address => mapping (bytes32 => address)) public delegation;
    
    // Using these events it is possible to process the events to build up reverse lookups.
    // The indeces allow it to be very partial about how to build this lookup (e.g. only for a specific delegate).
    event SetDelegate(address indexed delegator, bytes32 indexed id, address indexed delegate);
    event ClearDelegate(address indexed delegator, bytes32 indexed id, address indexed delegate);
    
    /// @dev Sets a delegate for the msg.sender and a specific id.
    ///      The combination of msg.sender and the id can be seen as a unique key.
    /// @param id Id for which the delegate should be set
    /// @param delegate Address of the delegate
    function setDelegate(bytes32 id, address delegate) public {
        require (delegate != msg.sender, "Can't delegate to self");
        require (delegate != address(0), "Can't delegate to 0x0");
        address currentDelegate = delegation[msg.sender][id];
        require (delegate != currentDelegate, "Already delegated to this address");
        
        // Update delegation mapping
        delegation[msg.sender][id] = delegate;
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{
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}
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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"bytes32","name":"id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"delegate","type":"address"}],"name":"ClearDelegate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"bytes32","name":"id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"delegate","type":"address"}],"name":"SetDelegate","type":"event"},{"inputs":[{"internalType":"bytes32","name":"id","type":"bytes32"}],"name":"clearDelegate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"delegation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"id","type":"bytes32"},{"internalType":"address","name":"delegate","type":"address"}],"name":"setDelegate","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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