How To Convert Address To Enum In Solidity?

Step 1: Define the Enum

Start by defining an enum. An enum is a user-defined type that consists of a series of named constants. In this case, we’ll create an enum called UserType.

enum UserType { Admin, User, Guest }
  • Admin: Represents a user with administrative privileges.
  • User: Represents a regular user.
  • Guest: Represents a user with minimal permissions.

Step 2: Map Address to Enum

Next, create a mapping that associates Ethereum addresses to your enum values. This map will allow you to keep track of user types based on their address.

mapping(address => UserType) public userTypes;
  • This line creates a public mapping called userTypes where each address maps to a UserType.

Step 3: Create a Function to Set User Type

You need a function to assign a user type to a specific address. This function will accept an address and a corresponding UserType.

function setUserType(address user, UserType userType) public {
    userTypes[user] = userType;
}
  • user: The Ethereum address of the user.
  • userType: The enum value you want to assign to that address.

Step 4: Create a Function to Retrieve User Type

To access the user type associated with an address, you’ll want to create a function that retrieves this information.

function getUserType(address user) public view returns (UserType) {
    return userTypes[user];
}
  • This function takes an address as input and returns the corresponding UserType.

Example Usage

Here’s how you might use the above components together in a contract.

pragma solidity ^0.8.0;

contract UserManagement {
    enum UserType { Admin, User, Guest }
    mapping(address => UserType) public userTypes;

    function setUserType(address user, UserType userType) public {
        userTypes[user] = userType;
    }

    function getUserType(address user) public view returns (UserType) {
        return userTypes[user];
    }
}

Explanation of Example Code

  1. Contract Declaration: The contract name is UserManagement.
  2. Enum Declaration: The three user types (Admin, User, Guest) are defined in the UserType enum.
  3. Mapping Setup: The mapping userTypes is established to link addresses to user types.
  4. setUserType Function: This function allows anyone to set the user type for any address (it can be restricted with access control if needed).
  5. getUserType Function: This reads and returns the user type for the given address.

Final Notes

  • Make sure you’re careful with who can set user types; consider adding access controls (like onlyAdmin) if needed.
  • Always test your smart contract thoroughly to avoid any security issues.

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