The Solidity Contract-Oriented Programming Language - By chatting here you agree to the https://github.com/ethereum/solidity/blob/develop/CODE_OF_CONDUCT.md
(also asked in compiler channel and they referred me here)
in assembly what is the storage location of return data?
put directly.. given the example below, what is location?
thanks in advance
given
... in contract
modifier defer(... args ..) {
_;
// want to use assembly here to access return data of modified function
// so I imagine it'd be like
bytes memory returnPtr;
assembly {
returnPtr := mload(location)
}
<Type> returnData;
(returnData) = abi.decode(returnPtr, <Type>);
// DO STUFF
}
function someFunction() defer(..args..) {
if (monday) {
return 42;
} else if (tuesday) {
return 32;
}
return 123;
}
Hey masters. Is this $$ a special keyword of solidity ?
function setContract(CoreContracts name, address contractAddress) public {
require(msg.sender == DIRECTORY, $$(ErrorCode(UNAUTHORIZED_CALLER))); <- this is the line with the "$$"
contracts[uint256(name)] = contractAddress;
}Found in this contract
HI, please ask a question, my project directory structure is like this, now I need to upload the source code to https://etherscan.io
But https://etherscan.io doesn't seem to support source code validation for this structure, it only supports single file source code and multiple file source code in the same directory, and my source code is multiple files in different directories.
Do you have any solution to this problem?
2 replies
Yes, you can include it on the “data” field of the transaction. I’m not sure of the number of the bytes but the limit is probably not a problem, unless you’re trying to share something huuuge like video or image content. Don’t do that on Ethereum, use IPFS for that.
See this SO question, and you need to add the “data” field to the transaction
https://ethereum.stackexchange.com/questions/87683/trying-to-send-a-transaction-with-ethers-js
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You can build with any language that compiles to the EVM. This includes Solidity, Julia, and new or experimental programming languages such as Vyper.
First of all, thank you Vitalik Buterin !
@Perelyn-sama i would define a dApp, decentralized Application, by now and here, you just need one Component as a smartContract.
To really understand, what a smartContract is, we’ll need some good „openMic“-Sessions, or some defining content.. leacked
Unite.
For following contract, if I change B, would it change bytecode of contract ?
I was assuming that due to treeShaking it should not
but when I changed B, bytecode also changed
Can you please explain ?
bytes32 constant a = bytes32(hex"1e8e1b45c8500eaae36dbdda78698134042397867d83fedc92005af7c108c793");
bytes32 constant b = bytes32(hex"9723a2a3c9b49f62a314da557d9f0e080f0af927614758f525c253a9cfd1597a");
library Lib {
function aaa() internal pure returns (bytes32) {
return a;
}
function bbb() internal pure returns (bytes32) {
return b;
}
}
contract HelloWorld {
function fn() external pure returns (bytes32) {
return Lib.aaa();
}
}
I asked question on OZ forum but nobody knows...
Is there somebody brave enough who would like to check it and perhaps collaborate?
I'm sure it will also help lots of devs in the future...
https://forum.openzeppelin.com/t/token-timelock-tips-caveats-etc/18404
Hey! I know this is specfic for solidity-devs, but maybe someone with more experience can help me. It's about some tools, mostly about hardhat and the compiler.
1. When i specified the compiler in hardhat.config. Is there any way to override an entire folder? I have one folder that have to be compiled with 0.6.12 and 1000 optimizer runs, and another with 0.6.12 but with 200 optimizer runs. In short: Can i do this with the entire folder? Or some ideas? lmao. I do not want to add every contract as override but if it the only way, ok(i already asked on Hardhat Discord yesterday)
2. Which values in the hardhat compiler we can say are default? I mean: i created the Input JSON description with Solt, and i copy the same settings that the I/O JSON in hardhat.config. The problem comes when i get a different bytecode compiling from the Solidity file with hardhat, and compiling with solc --standard-json (using the same version with hardhat btw). It's no problem with the "metadata hash" at the end of the bytecode - actually, i get the same metadata hash . It's really different on several points along the bytecode. These contracts are using abiEncoderV2 too. This problem doesnt happen with all the contracts. I not checked the bytecode from each contract, but until now - i see this difference only on the contracts with AbiEncodeV2. So, idk if Hardhat add some setting that are not "default". Could be that the reason that i get different bytecode? Or something else?
I really know that could be dense all these questions, but i really spend full time with my own research and still getting different bytecode with those contracts with AbiEncodeV2.
Thanks for any answer :)
Hello, everyone. I am about to test a Solidity code in hardhat, but I am not sure how to test the contract with IERC-20 in it's constructor parameters.
For example,
constructor(
IERC20 token1,
IERC20 token2
) {
}
Anybody to give me some advice of how to compile and test this?
Thank you in advance.
