9

I created an array of structures and then tried to get the values of each account of an array. But I failed with an array while passing the address variable which contains msg.sender and the type is not visibly convertible to uint256. How can I do it?

Al Sweigart
  • 11,566
  • 10
  • 64
  • 92
Zera Abhraham
  • 91
  • 1
  • 1
  • 2
  • Welcome to SO! Please add some code, so we can see what you have tried so far. It's hard to tell where the Error may lies by now. – MiBrock Apr 10 '17 at 09:34

3 Answers3

41

As of Solidity v0.8, you can no longer cast explicitly from address to uint256.

You can now use:

uint256 i = uint256(uint160(msg.sender));

function f(address a) internal pure returns (uint256) {
  return uint256(uint160(a));
}
cfly24
  • 1,882
  • 3
  • 22
  • 56
5

You can cast it explicitly:

uint256 i = uint256(msg.sender);

function f(address a) constant returns (uint256) {
    return uint256(a);
}
Zvezdomir Zlatinov
  • 302
  • 1
  • 3
3

Pre v0.8.0 of Solidity you could do:

pragma <0.8.0;

return address(toUint(item));

Post v0.8.0 of Solidity you must now do:

pragma ^0.8.0

return address(uint160(toUint(item)));
  • References

address(uint) and uint(address): converting both type-category and width. Replace this by address(uint160(uint) and uint(uint160(address)) respectively.

see v0.8.0 breaking changes, Solidity Documentation

Sam Bacha
  • 81
  • 3