2023-02-25

Enum 枚举

一个合约可以有多个枚举

pragma solidity ^0.8.0;

contract Example {
    enum Status { Pending, Approved, Rejected }
    enum Color { Red, Green, Blue }
}

枚举的相关赋值方法以及重置

//文件：test_enum.sol

pragma solidity ^0.8.17;
// SPDX-License-Identifier: mit
import "./enum.sol"; //可以直接引入文件
contract status {
    enum state{
        pending,
        shipped,
        accepted,
        rejected,
        canceled
    }
    enum testa{
        aaaed,
        bbbed,
        ced
    }
    state public ss;

    function get() public view returns(state) {
        return ss;
    }
    function setState(state stt) public {
        ss = stt;
    }
    function cancel() public {
        ss = state.canceled;
    }
    function reset() public {
        delete ss;//会重置为零
    }
    function setStateByNum(uint index) public {
        ss = state(index);//根据索引进行赋值
    }
    function test() public returns(bool) {
        setStateByNum(1);
        return (ss==state.shipped);
    }

}

//文件：enum.sol

pragma solidity ^0.8.17;
//SPDX-License-Identifier: MIT
enum _status {
    Pending,
    Shipped,
    Accepted,
    Rejected,
    Canceled
}