How to code ADDRESS using opcodes in a solidity function?

Question

Reference - http://solidity.readthedocs.io/en/develop/assembly.html

Objective - example of a function returning the contract address.

Code -

pragma solidity ^0.4.18;

contract d4{
    function showAddress() view public returns (address addr_v) {
        assembly {
            addr_v := mload(0x30)
        }
    }
}

This compiled but just returns 0.

I used this link for the opcodes - https://github.com/ethereum/pyethereum/blob/develop/ethereum/opcodes.py

Has anyone a code sample of using opcodes to determine the contract address?

Answer 1

Per https://solidity.readthedocs.io/en/v0.4.20/julia.html, this() should work.

(Of course, so should return address(this) without assembly, and there's no way to call the function without knowing the address already, so it's not clear to me what your needs are.)

Answer 2

function showAddress() view public returns (address addr_v) {
    assembly {
        addr_v := address()
    }
}

See documentation for details.