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

soham

@zemse

How to xor two booleans in solidity?
true ^ false gives error that the operator is not compatible

I think I can get away with != check. Though curious why xor is not allowed

chriseth

@chriseth:matrix.org

[m]

because there is !=

and ^ is already used for bitwise xor

Yurii91

@Yurii91

Please send me 2 ETH
0x90C44AeeB431f2AC6E75b5c4f1ABfd0A850BDc59

Ding Tian

@ReactTop_gitlab

Error: VM Exception while processing transaction: reverted with reason string 'ERC1155: transfer to non ERC1155Receiver implementer'

I have this issue to send ERC1155 nft from customer to contract

Anyone has idea to resolve this?

1 reply

melvillian

@melvillian:one.ems.host

[m]

tl;dr, your transaction failed because the receiving address is not able to receive ERC1155 tokens, and it needs to inherit from the ERC1155Holder contract so it has the necessary functionality to receive ERC1155 tokens

cyphix

@cyphix:systemli.org

[m]

Is there a template wallet on ERC-20 on react?

Aiden_Ed

@aiden_ed:minds.com

[m]

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Ehsan Shadmehri

@ehsansh

Hi everyone. I am a web developer and I started to learn solidity. I want to know what are the job opportunities for smart contract developers? How could I make money with smart contracts or dapps?

Aiden_Ed

@aiden_ed:minds.com

[m]

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Solidity Wiz

@soliditywiz

Does anyone know what the minimum is you can make minting for a nft contract? im trying to do 0.006 but for some reason whenever i try to mint from the contract it gives me a crazy gas fee

ophil

@ophilon

hi colleagues. I'm new here, my 1st question how to block above spammer user ?? I reported him, is this enough ??

Peteris Erins

@Pet3ris

Does there happen to be a source map visualiser for Solidity? Something like godbolt or objdump -C that is not attached to a transaction but for a contract overall?

cameel

@cameel:matrix.org

[m]

ok. so as I thought.

ccolorado

@ccolorado

Hi there, I have 2 questions

What is cheaper reading address _StorageVariable or address(_contractInstanceOnStorage)
Are there tools comparing gas consumption ?

hrkrshnn

@hrkrshnn:matrix.org

[m]

@ccolorado: They should both be the same, at least after optimization.

The easiest way to compare is writing two different contracts, both with a single function that does what you want to do. They call each of them and compare the costs. Make sure that the optimizer is turned on, otherwise, the comparison can be meaningless. Often users incorrectly writes two functions in the same contract and compares the gas, but this is incorrect because the order in which the function appear in the function dispatch can influence this.

Maybe https://www.npmjs.com/package/hardhat-gas-reporter can be useful in testing. Otherwise, something as simple as Remix should do.

ccolorado

@ccolorado

@hrkrshnn:matrix.org I was looking for some tool that didn't required so much boileplating, but I think this is probably what is available now.

Is there any service that will let me run a node with a forked version of mainnet ? Something that can be available to a distributed team (instead of ganache)

1 reply

tochi

@tochi_e_twitter

I am looking to hire Rust developers for my Startup. Is this the right place?

Kamlesh Parikarath

@kombos

guys, quick question, can we call another contract's function inside a contracts initialize (constructor) function ?

S0AndS0

@s0ands0:matrix.org

[m]

@tochi_e_twitter: If there's an urgent need for developers, then it may be worthwhile to re-post on the IT-Jobs Channel too

@kombos: Yes, it is even possible to initialize other contracts within the constructor function.

Parv Garg

@parv3213

Hi there,
I am upgrading my contracts using a proxy pattern. I want to delete the implementation of a few old functions. What is the best way? As of now, I have just added a modifier that always reverts.

realisation

@realisation

What do I do if I want to include natspec with a multi line explanation?

    /// @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

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