Address Payable and New Contracts

Question

The following compiles in 0.4.26, but not 0.5.0. The error is "Type contract CustList is not implicitly convertible to expected type address." I figure it's something with address payable, but I have tried ever casting permutation and can't get this to work in 0.5.0.

pragma solidity ^0.5.0;

contract CustTest {
    mapping(address  => address) public customers;  
    function createProfile()
        public
    {
    customers[msg.sender] = new CustList();
    }
}

contract CustList { uint x;}

Answer 1

Solidity pre 0.5 does an implicit conversion from Contract to address but from > 0.5.x focus has been more on explicit conversions

To fix you can follow either of these approaches:

pragma solidity ^0.5.0;

contract CustTest { 
  mapping(address => CustList ) public customers;
  function createProfile() public { 
    customers[msg.sender] = new CustList(); 
  } 
}

contract CustList { 
  uint x;
}

or another approach is to cast new CustList() to an address itself

pragma solidity ^0.5.0;

contract CustTest { 
  mapping(address => address) public customers;
  function createProfile() public { 
    customers[msg.sender] = address(new CustList()); 
  } 
}

contract CustList { 
  uint x;
}

PS: For every invocation of createProfile() you are deploying a new CustList contract on-chain via an internal transaction.