ERC20 turns five
I only realized when recommending a community member read the EIP and noticed the date. I had to check the date of the original issue: https://github.com/ethereum/eips/issues/20
Always be closing
Whilst I am not a maintainer, this is great advice.
Copy paste
The forum has this awesome widget for copying a block of code (top right corner of code below).
I keep looking for it when I use the documentation: https://docs.openzeppelin.com/learn/developing-smart-contracts#first-contract
// contracts/Box.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
contract Box {
uint256 private value;
// Emitted when the stored value changes
event ValueChanged(uint256 newValue);
// Stores a new value in the contract
function store(uint256 newValue) public {
value = newValue;
emit ValueChanged(newValue);
}
// Reads the last stored value
function retrieve() public view returns (uint256) {
return value;
}
}
Grateful
Linking a Library in Hardhat
Answer.sol
// contracts/Answer.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
library Answer {
function getAnswer() public returns (uint256) {
return 42;
}
}
Box.sol
// contracts/Box.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "./Answer.sol";
contract Box {
uint256 private value;
// Emitted when the stored value changes
event ValueChanged(uint256 newValue);
// Stores a new value in the contract
function store(uint256 newValue) public {
value = newValue;
emit ValueChanged(newValue);
}
function storeAnswer() public {
store(Answer.getAnswer());
}
// Reads the last stored value
function retrieve() public view returns (uint256) {
return value;
}
}
Deploy.js
// scripts/deploy.js
async function main() {
const Answer = await ethers.getContractFactory("Answer");
console.log("Deploying Answer...");
const answer = await Answer.deploy();
await answer.deployed();
console.log("Answer deployed to:", answer.address);
// Library linking: https://hardhat.org/plugins/nomiclabs-hardhat-ethers.html#library-linking
const Box = await ethers.getContractFactory("Box", {libraries: { Answer: answer.address} });
console.log("Deploying Box...");
const box = await upgrades.deployProxy(Box, [42], { initializer: 'store', unsafeAllowLinkedLibraries: true });
console.log("Box deployed to:", box.address);
}
main()
.then(() => process.exit(0))
.catch(error => {
console.error(error);
process.exit(1);
});
Convert Markdown to asciidoc
OpenZeppelin Documentation is in asciidoc format.
When converting from Markdown (e.g. in the forum or from Notion) you can use pandoc.
pandoc --wrap=none --atx-headers -t asciidoc -f markdown --smart < test.md > test.adoc