example contract using AddrArrayLib

TokenContract.sol

pragma solidity >= 0.4.25 < 0.6.0;

import '../node_modules/openzeppelin solidity/contracts/ownership/Ownable.sol';
import '../node_modules/openzeppelin-solidity/contracts/math/SafeMath.sol';
import './AddrArrayLib.sol';

contract TokenContract is Ownable {
  using AddrArrayLib for AddrArrayLib.Addresses;
  using SafeMath for uint256;
  
  // List of trusted addresses which can mint tokens
  AddrArrayLib.Addresses trustedMinters;

  uint256 public totalSupply;
  mapping (address => uint256) balances;
  
  constructor () public {
    totalSupply = 100;
    balances[msg.sender] = 100;
  }

  function addMinter(address minter) public onlyOwner() {
    trustedMinters.pushAddress(minter);
  }

  function removeMinter(address minter) public onlyOwner() {
    trustedMinters.removeAddress(minter);
  }

  function mintToken(address to, uint256 amount) external {
    require(trustedMinters.exists(msg.sender), 'The sender address is not registered as a Minter');
    totalSupply = totalSupply.add(amount);
    balances[to] = balances[to]. add(amount);
  }
 
}