ethereum/solidity

The Solidity Contract-Oriented Programming Language - By chatting here you agree to the https://github.com/ethereum/solidity/blob/develop/CODE_OF_CONDUCT.md

realisation

@realisation

    /// @notice Takes in the open interest and appllies Overlay's monetary policy
    /// @dev The impact is a measure of the demand placed on the market over 
    /// @dev a rolling window.

do I need a second @dev on the next line or do I just make a new line?

chriseth

@chriseth:matrix.org

[m]

just use a new line

smrpn

@smrpn:matrix.org

[m]

what does constructor() { owner = payable(msg.sender); } mean in a contract?

chriseth

@chriseth:matrix.org

[m]

the payable(...) converts an address to an address payable

it means you are declaring that msg.sender can receive ether

贝克街的天才

@yuyenews

Record the creator when the contract is initialized

smrpn

@smrpn:matrix.org

[m]

okay, so here msg.sender is the address who is calling the contract?

贝克街的天才

@yuyenews

yes

smrpn

@smrpn:matrix.org

[m]

how do i get the address which deployed the contract?

i'm making a nft marketplace, and i want to transfer a percentage of the sale to the contract owner

chriseth

@chriseth:matrix.org

[m]

in the constructor, msg.sender is the deployer

贝克街的天才

@yuyenews

View the value of the owner variable of the contract on the block browser. If the contract was deployed by you, then the contract owner is the address of the wallet you used to deploy the contract.

1 reply

https://etherscan.io/

smrpn

@smrpn:matrix.org

[m]

ohhh

okay, how do I get this address in my solidity contract?

like, is there any way i can get that address using an inbuilt function?

贝克街的天才

@yuyenews

Not quite sure what you mean, are you trying to get the owner of another contract in your contract?

2 replies

贝克街的天才

@yuyenews

smrpn

@smrpn:matrix.org

[m]

thanks

George Carder

@georgercarder

(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;
}

Br4ndonP0nce

@Br4ndonP0nce

Yo hey guys, im having a dumb problem probably, i cant assign a value to a key in a mapping, if i do it thru a function it works but if i want to do it as the result of an if confitional it just returns 0

Tadashi

@htadashi

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

Oh nvm. Just found out the answer... is a command for solpp, a solidity pre-processor

贝克街的天才

@yuyenews

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?

贝克街的天才

@yuyenews

Here you can only select multiple files in the same directory at once

Roney

@Roney16325329_twitter

Free mining. https://ryzex.net/a/9332082

melbourne2991

@melbourne2991

do unused arguments end up in the transaction log?

I basically want an additional piece of data to operate on externally of contract. I know I could use an event for this, but wondering if I could just add an extra arg as a cheaper alternative?

berktaylan

@berktaylan

hello everyone , im newly intrested with smart contracts , i got a theorical question ( not coding or development help ) anyone can help me to understand something i dont know about smart chains

rxx

@rxx:converser.eu

[m]

which is the ethereum space?

João Vitor Ianuci

@joaoianuci

Hello guys, I'm new on solidity contracts - I have a problem doing a contract with mint number of 20K unique nfts, How I can check that an ipfs metadata already minted, there a way without a large loop?

Moody Salem

@moodysalem

hey yall... is the solidity baked in safemath the cheapest implementation?

1 reply

i'm finding switching from our implementation to the builtin makes operations more gas expensive

in addition, it added 500 bytes of bytecode

Merouane B.

@cryptofact

Hi, i’m looking to batch mint NFTs with the optimal gas fees, NFTs have single copy of each. Should I use ERC 721 or 1155 to do so ?

chriseth

@chriseth:matrix.org

[m]

what did you ure before?

Richard Zhang

@rrzhang139

Hi guys, do you consider scaling contracts to multiple contracts (maybe Factory design)? I'm worried that storing data on 1 contract will be costly

Perelyn Sama

@Perelyn-sama

Hey does anyone have a way to create a react dapp? I tried the truffle react box but I'm getting some errors

Nikolay Toplev

@nikolaytoplev0306:matrix.org

[m]

Hi, everyone. I would be grateful for who can help me with triggering function call in solidity per block on binance smart chain. Thank you in advance.

Code Chef

@devofficer

Does anyone know how to trigger function calls per block in solidity?

2 replies

Nikolay Toplev

@nikolaytoplev0306:matrix.org

[m]

Could you offer me a link to show how to do that?

2 replies

shibatoshinakamoto

@shibatoshinakamoto:matrix.org

[m]

hello can someone help me understand why i cant withdraw my token

even tho the solidity code looks safe

tried all slippage

Jonathan Gros-Dubois

@jondubois

Does Ethereum support adding custom data to transactions?

If so, how many bytes in a transaction?

melvillian

@melvillian:one.ems.host

[m]

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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