A tutorial contract holding a 3 by 3 grid of tile structs, deployed 30 September 2015.
Historical Significance
A grid of structs passed in at construction and read back as a nested array, deployed to find out whether the compiler of the day could do it. Multi-dimensional arrays crossing the ABI boundary were new and unreliable, and contracts like this are how the limits were established, by trying them on the live chain and reading the result.
Context
Deployed two months after the Frontier launch, while the limits of the ABI on nested types were still being mapped out.
Key Facts
Description
The contract declares a three by three fixed array of Tile structs, each tile carrying an owner address, an elevation and a pointer to another contract meant to describe how the tile looks. It exists to test whether structs nested inside a fixed two-dimensional array could be written, read back and returned across the ABI, which was not settled at the time. It inherits the mortal base contract that solc shipped as a built in, so the creator could destroy it, and that was done: no code remains at the address and the source is matched against the bytecode as archived at deployment. Deployed by Cyrus Adkisson from 0xcf684dfb8304729355b58315e8019b1aa2ad1bac.
Source Verified
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)
// Submitted by EthereumHistory (ethereumhistory.com)
import "mortal";
// contract Descriptor {
// function getDescription() constant returns (uint16[3]){
// uint16[3] somevar;
// return somevar;
// }
// }
contract ArrayPasser is mortal {
address creator;
/***
* 1. Declare a 3x3 map of Tiles
***/
uint8 mapsize = 3;
Tile[3][3] tiles;
struct Tile
{
/***
* 2. A tile is comprised of the owner, elevation and a pointer to a
* contract that explains what the tile looks like
****/
uint8 elevation;
//Descriptor descriptor;
}
/***
* 3. Upon construction, initialize the internal map elevations.
* The Descriptors start uninitialized.
***/
function ArrayPasser(uint8[9] incmap)
{
creator = msg.sender;
uint8 counter = 0;
for(uint8 y = 0; y < mapsize; y++)
{
for(uint8 x = 0; x < mapsize; x++)
{
tiles[x][y].elevation = incmap[counter];
counter = counter + 1;
}
}
}
/***
* 4. After contract mined, check the map elevations
***/
function getElevations() constant returns (uint8[3][3])
{
uint8[3][3] memory elevations;
for(uint8 y = 0; y < mapsize; y++)
{
for(uint8 x = 0; x < mapsize; x++)
{
elevations[x][y] = tiles[x][y].elevation;
}
}
return elevations;
}
}External Links
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