1
contract Bogus {

    mapping(address => bool) internal iNeedItToBeTrueByDefault;

    function Bogus() {

        ???...
    }
}
  • 1
    if you can be more specific on requirement, workarounds might be suggested – Achala Dissanayake May 4 '18 at 12:55
2

You can't.

What you can do is the inverse.

You keep track of the "blacklisted" addresses, instead of the whitelisted ones.

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