Yes, it depends on the number of members in the enum
.
See the official documentation:
pragma solidity >=0.4.16 <0.6.0;
contract test {
enum ActionChoices { GoLeft, GoRight, GoStraight, SitStill }
ActionChoices choice;
ActionChoices constant defaultChoice = ActionChoices.GoStraight;
function setGoStraight() public {
choice = ActionChoices.GoStraight;
}
// Since enum types are not part of the ABI, the signature of "getChoice"
// will automatically be changed to "getChoice() returns (uint8)"
// for all matters external to Solidity. The integer type used is just
// large enough to hold all enum values, i.e. if you have more than 256 values,
// `uint16` will be used and so on.
function getChoice() public view returns (ActionChoices) {
return choice;
}
function getDefaultChoice() public pure returns (uint) {
return uint(defaultChoice);
}
}