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March 21, 2021 16:42
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.26+commit.4563c3fc.js&optimize=false&runs=200&gist=
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REMIX EXAMPLE PROJECT | |
Remix example project is present when Remix loads very first time or there are no files existing in the File Explorer. | |
It contains 3 directories: | |
1. 'contracts': Holds three contracts with different complexity level, denoted with number prefix in file name. | |
2. 'scripts': Holds two scripts to deploy a contract. It is explained below. | |
3. 'tests': Contains one test file for 'Ballot' contract with unit tests in Solidity. | |
SCRIPTS | |
The 'scripts' folder contains example async/await scripts for deploying the 'Storage' contract. | |
For the deployment of any other contract, 'contractName' and 'constructorArgs' should be updated (along with other code if required). | |
Scripts have full access to the web3.js and ethers.js libraries. | |
To run a script, right click on file name in the file explorer and click 'Run'. Remember, Solidity file must already be compiled. | |
Output from script will appear in remix terminal. |
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pragma solidity ^0.4.4; | |
contract Token { | |
/// @return total amount of tokens | |
function totalSupply() constant returns (uint256 supply) {} | |
/// @param _owner The address from which the balance will be retrieved | |
/// @return The balance | |
function balanceOf(address _owner) constant returns (uint256 balance) {} | |
/// @notice send `_value` token to `_to` from `msg.sender` | |
/// @param _to The address of the recipient | |
/// @param _value The amount of token to be transferred | |
/// @return Whether the transfer was successful or not | |
function transfer(address _to, uint256 _value) returns (bool success) {} | |
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from` | |
/// @param _from The address of the sender | |
/// @param _to The address of the recipient | |
/// @param _value The amount of token to be transferred | |
/// @return Whether the transfer was successful or not | |
function transferFrom( | |
address _from, | |
address _to, | |
uint256 _value | |
) returns (bool success) {} | |
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens | |
/// @param _spender The address of the account able to transfer the tokens | |
/// @param _value The amount of wei to be approved for transfer | |
/// @return Whether the approval was successful or not | |
function approve(address _spender, uint256 _value) returns (bool success) {} | |
/// @param _owner The address of the account owning tokens | |
/// @param _spender The address of the account able to transfer the tokens | |
/// @return Amount of remaining tokens allowed to spent | |
function allowance(address _owner, address _spender) | |
constant | |
returns (uint256 remaining) | |
{} | |
event Transfer(address indexed _from, address indexed _to, uint256 _value); | |
event Approval( | |
address indexed _owner, | |
address indexed _spender, | |
uint256 _value | |
); | |
} | |
contract StandardToken is Token { | |
function transfer(address _to, uint256 _value) returns (bool success) { | |
//Default assumes totalSupply can’t be over max (2²⁵⁶ — 1). | |
//If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn’t wrap. | |
//Replace the if with this one instead. | |
//if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) { | |
if (balances[msg.sender] >= _value && _value > 0) { | |
balances[msg.sender] -= _value; | |
balances[_to] += _value; | |
Transfer(msg.sender, _to, _value); | |
return true; | |
} else { | |
return false; | |
} | |
} | |
function transferFrom( | |
address _from, | |
address _to, | |
uint256 _value | |
) returns (bool success) { | |
//same as above. Replace this line with the following if you want to protect against wrapping uints. | |
//if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) { | |
if ( | |
balances[_from] >= _value && | |
allowed[_from][msg.sender] >= _value && | |
_value > 0 | |
) { | |
balances[_to] += _value; | |
balances[_from] -= _value; | |
allowed[_from][msg.sender] -= _value; | |
Transfer(_from, _to, _value); | |
return true; | |
} else { | |
return false; | |
} | |
} | |
function balanceOf(address _owner) constant returns (uint256 balance) { | |
return balances[_owner]; | |
} | |
function approve(address _spender, uint256 _value) returns (bool success) { | |
allowed[msg.sender][_spender] = _value; | |
Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function allowance(address _owner, address _spender) | |
constant | |
returns (uint256 remaining) | |
{ | |
return allowed[_owner][_spender]; | |
} | |
mapping(address => uint256) balances; | |
mapping(address => mapping(address => uint256)) allowed; | |
uint256 public totalSupply; | |
} | |
contract ERC20Token is StandardToken { | |
function() { | |
//if ether is sent to this address, send it back. | |
throw; | |
} | |
/* Public variables of the token */ | |
string public name = "Blondie Smile Coint"; //Name of the token | |
uint8 public decimals = 3; //How many decimals to show. ie. There could 1000 base units with 3 decimals | |
string public symbol = "BSM"; //An identifier: eg AXM | |
string public version = "H1.0"; //human 0.1 standard. Just an arbitrary versioning scheme. | |
// | |
// CHANGE THE FOLLOWING VALUES FOR YOUR TOKEN! | |
// | |
//make sure this function name matches the contract name above. So if you’re token is called TutorialToken, make sure the //contract name above is also TutorialToken instead of ERC20Token | |
function ERC20Token() { | |
balances[msg.sender] = 10000; // Give the creator all initial tokens (100000 for example) | |
totalSupply = 50000; // Update total supply (100000 for example) | |
name = "Blondie Smile Coin"; // Set the name for display purposes | |
decimals = 3; // Amount of decimals | |
symbol = "BSM"; // Set the symbol for display purposes | |
} | |
/* Approves and then calls the receiving contract */ | |
function approveAndCall( | |
address _spender, | |
uint256 _value, | |
bytes _extraData | |
) returns (bool success) { | |
allowed[msg.sender][_spender] = _value; | |
Approval(msg.sender, _spender, _value); | |
//call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn’t have to include a contract in here just for this. | |
//receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData) | |
//it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead. | |
if ( | |
!_spender.call( | |
bytes4( | |
bytes32( | |
sha3("receiveApproval(address,uint256,address,bytes)") | |
) | |
), | |
msg.sender, | |
_value, | |
this, | |
_extraData | |
) | |
) { | |
throw; | |
} | |
return true; | |
} | |
} |
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