ripwu

spalladino

pragma solidity ^0.7.0;

// Each mining pool that intends to provide flash loans deploys a Loaner contract and transfers ETH to it
// When testing each bundle, the diff in balance in this contract is taking into account for calculating effective gas price
// The contract loans funds only on blocks mined by the miner and on zero-gasprice txs
contract Loaner {
    address immutable owner;
    
    constructor(address _owner) {
        owner = _owner;

alkavan

Install Instructions

Install Hardhat

npm install --save-dev hardhat

Initiate a new Hardhat project (in empty directory)

npx hardhat

spalladino

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

spalladino

export async function tryGetRevertReason(to: string, from: string, data: string): Promise<string | undefined> {
  const provider = ethers.getDefaultProvider();
  const tx = { to, from, data };
  try {
    await provider.estimateGas(tx);
  } catch {
    const value = await provider.call(tx);
    return hexDataLength(value) % 32 === 4 && hexDataSlice(value, 0, 4) === '0x08c379a0'
      ? defaultAbiCoder.decode(['string'], hexDataSlice(value, 4))
      : undefined;

MrChico

;; overflow checking words vs. checking explicit bounds
;; x * y / y == x     <==>
;; x * y does not overflow


;; max value of (_ BitVec 256)
(define-fun pow256 () Int
  115792089237316195423570985008687907853269984665640564039457584007913129639936)

;; x * y / y == x

jcmartinezdev

pragma solidity ^0.4.24;

// ----------------------------------------------------------------------------
// Sample token contract
//
// Symbol        : LCST
// Name          : LCS Token
// Total supply  : 100000
// Decimals      : 2
// Owner Account : 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe

mbwhite

// Grammar for parsing of the Fabric Endorsment Policies
//
// Defined in the documentation at 
// https://hyperledger-fabric.readthedocs.io/en/latest/endorsement-policies.html#endorsement-policy-syntax

// The expression will be an operator with arguments, each of the arguments can be an expression
// The OutOf operator is a bit different as that demands the first agument be a number
Expression 
   =  op:Operator '(' _ args:Some_Expression_Args _ ')' 
      {

MrChico

behaviour init of Token
interface constructor(string _symbol, string _name, string _version, uint _totalSupply)

creates Token
    string name         := _name
    string symbol       := _symbol
    uint256 totalSupply := _totalSupply

    mapping(address => uint) balanceOf :=  [CALLER := _totalSupply]
    mapping(address=>mapping(address=>uint)) allowance := []

danieldogeanu

You should not use the Open SSH client that comes with Git for Windows. Instead, Windows 10 has its own implementation of Open SSH that is integrated with the system. To achieve this:

1. Start the ssh-agent from Windows Services:

• Type Services in the Start Menu or Win+R and then type services.msc to launch the Services window;
• Find the OpenSSH Authentication Agent in the list and double click on it;
• In the OpenSSH Authentication Agent Properties window that appears, choose Automatic from the Startup type: dropdown and click Start from Service status:. Make sure it now says Service status: Running.

2. Configure Git to use the Windows 10 implementation of OpenSSH by issuing the following command in Powershell:

git config --global core.sshCommand C:/Windows/System32/OpenSSH/ssh.exe