A struct and for loop exercise from Cyrus Adkisson's Solidity walkthrough
Historical Significance
The struct and for loop chapter of cyrusadkisson/solidity-baby-steps, deployed 20 September 2015 and later destroyed. It stores a fixed array of structs and reads one field back through a getter. The contract has no code on the chain any more, so this source is matched against the creation transaction input rather than against a live runtime.
Context
Frontier era deployment by Cyrus Adkisson, from his Solidity teaching repository.
Key Facts
Description
The struct and for loop chapter of cyrusadkisson/solidity-baby-steps, deployed 20 September 2015 and later destroyed. It stores a fixed array of structs and reads one field back through a getter. The contract has no code on the chain any more, so this source is matched against the creation transaction input rather than against a live runtime.
Source Verified
Exact creation bytecode match. Author Cyrus Adkisson published source at https://github.com/cyrusadkisson/solidity-baby-steps/blob/master/contracts/65_struct_and_for_loop_tester.sol. Batch-matched against 357 deploy TXs from deployer 0xcf684dfb8304729355b58315e8019b1aa2ad1bac.
Historian Categories
Heuristic Analysis
The following characteristics were detected through bytecode analysis and may not be accurate.
Frontier Era
The initial release of Ethereum. A bare-bones implementation for technical users.
Bytecode Overview
Verified Source Available
Source verified through compiler archaeology and exact bytecode matching.
View Verification ProofShow source code (Solidity)
// This contract creates a 9x9 map of Tile objects.
// Each tile has an elevation value (as well as an owner and descriptorContract which aren't used here)
//
// In the constructor, the elevations are set to standard values via for loops.
contract StructAndFor {
address creator;
uint8 mapsize = 9;
Tile[9][9] tiles;
struct Tile
{
address owner;
address descriptorContract;
uint8 elevation;
}
function StructAndFor()
{
creator = msg.sender;
for(uint8 y = 0; y < mapsize; y++)
{
for(uint8 x = 0; x < mapsize; x++)
{
tiles[x][y].elevation = mapsize*y + x; // row 0: 0, 1, 2, 3, 4... row 1: 9, 10, 11, 12
}
}
}
function getElevation(uint8 x, uint8 y) constant returns (uint8)
{
return tiles[x][y].elevation;
}
/**********
Standard kill() function to recover funds
**********/
function kill()
{
if (msg.sender == creator)
{
suicide(creator); // kills this contract and sends remaining funds back to creator
}
}
}External Links
Related contracts
GetBalance
Same deployerCyrus Adkisson experimental getter (Sep 2015) exposing the ether balance of a hardcoded address via getMyBalance(). Verified byte-for-byte with soljson v0.1.1.
0x759ad4...239a87August 26, 2015Contract 0xddcd64...a08e7b
Same deployerThe greeter tutorial contract: it stores a greeting set at deployment and can be shut down by its owner.
0xddcd64...a08e7bAugust 26, 2015basicInfoGetter
Same deployerA tour of the EVM globals, carrying the constructor of the file it was copied from
0xad826c...d33547August 31, 2015Contract 0x3ea0db...b922e0
Same deployerThe basic info getter from the solidity-baby-steps tutorials, a read only window onto the block and message globals.
0x3ea0db...b922e0August 31, 2015Contract 0xba575c...78733f
Same deployerA contract built to probe what the msg globals actually return, endowed with 5 ETH, deployed 1 September 2015.
0xba575c...78733fSeptember 1, 2015Contract 0x8b180c...c084df
Same deployerA third deployment of the msgExaminer that records its own creation message
0x8b180c...c084dfSeptember 1, 2015