Questions tagged [solidity]
Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript and it is designed for writing smart contracts in Ethereum to run on the EVM. Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.
5,296
questions with no upvoted or accepted answers
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views
What's the difference between unlinked_binary and bytecode?
I have two different projects. In one, the build/token.json file contains an unlinked_binary field. In the other, there's no unlinked_binary, but there's bytecode.
What's the difference between the ...
- 783
3
votes
1
answer
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views
CALL always throws exception on SSTORE
this.call(bytes4(keccak256("setGBA(uint32)")), 12);
How to call function by string name? I can't modify store in function. How to do this?
3
votes
0
answers
620
views
Why the transaction reverted?
Try to run my contract in remix JavaScriptVM and faced with error.
Contract code:
...
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract ...
- 31
3
votes
1
answer
479
views
Update struct from function only if parameters exists
What's the appropriate way to update a struct via a function only if the parameters exist? For example
struct MyStruct {
bytes32 someThing
bytes32 someOtherThing
}
function updateStruct(bytes32 ...
- 415
3
votes
1
answer
164
views
Solidity standard library: how to contribute?
I'd like to contribute to Solidity standard library, which seems a bit feature-less. How can I do that? Is there are some agreements about Solidity standard lib like in c++?
I have implemented some ...
- 73
3
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0
answers
668
views
Brew linkapps deprecated, unable to install on Mac
brew linkapps solidity
Warning: brew linkapps has been deprecated and will eventually be removed!
Unfortunately brew linkapps cannot behave nicely with e.g. Spotlight using
either aliases or symlinks ...
user22075
3
votes
2
answers
169
views
Is Solidity creating an implicit getter for a nested contract that is created?
Is Solidity creating an implicit getter or not for a nested contract that is created?
Example:
contract Foo {
....
}
contract Bar {
Foo public foo;
Bar() {
foo = new Foo();
}
...
- 131
3
votes
0
answers
286
views
Homomorphic Secret Sharing
Speaking of Ethereum blockchain, Is it possible to perform homomorphic secret sharing algorithmic calculations like SSS/pVSS/VSS on-chain? or should this be calculations performed off-chain
- 107
3
votes
1
answer
325
views
error: invalid opcode using modifier
Im getting the following error when trying to run my js test file using truffle:
Error: VM Exception while executing eth_call: invalid opcode
The js test file is the following:
var DebitService = ...
3
votes
0
answers
1k
views
ParserError: Source "contracts/Token.sol" not found: File import callback not supported
I have problem when I use truffle test. I seperated files used in contract with Solidity framework and I can't compile my code(see below). When code is not seperated works fine.
I tried reinstall ...
- 131
3
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0
answers
172
views
Is there a "gas penalty" for using too many asserts in a contract?
I'm at a very puzzling scenario.
While using Remix, I noticed that adding a few asserts has caused a significant increase in execution cost (from ~50K to ~59K). And not only did it increase the ...
- 25.8k
3
votes
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Why is the transaction hash (tx.hash) not available in Solidity?
Why not solidity provide tx.TxHash (only tx.gasprice , tx.origin)?
reference https://solidity.readthedocs.io/en/develop/units-and-global-variables.html，
tx.TxHash，Transaction(ID) Hash, it should be ...
- 31
3
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0
answers
209
views
Contract creation from another contract succeeds, then fails?
I have a first contract with some very basic functionality :
contract ContractA {
uint public supplyA;
function ContractA (uint _supply) {
supplyA = _supply;
}
function ...
3
votes
0
answers
206
views
What is the runtime performance of Ethereum Libraries compared to Contracts?
I'm looking for the cheapest way (in terms of gas price) to design upgradeable contracts. I don't expect many upgrades.
Being inspired by Writing upgradable contracts in Solidity, I'm investigating ...
- 438
3
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0
answers
131
views
Assuming EIP140, is remaining gas refunded when a called contract throws?
Under EIP140 (REVERT) and assuming Solidity ≥0.4.10. If I call from my contract to a function on an external contract, and this external function does an invalid jump, does my contract still call ...
- 403
3
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answers
127
views
What is the fastest way to call a function for incoming ICO
We have Alarm Contract: http://docs.ethereum-alarm-clock.com/en/latest/
We have parity client-side scheduling: Parity - How to schedule a transaction?
We can write custom contracts similar to this ...
- 4,327
3
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answers
258
views
Checking if an address is encoded on the end of a bytes array
I have a bytes array. Within the last 20 bytes, there is an address stored.
I am trying to compare the address at the end of this array to the address of a msg.sender, and am wondering if there is a ...
- 770
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answers
218
views
Implement constant search function in Solidity or in Javascript?
I am working with Meteor + Web3. Is it recommendable to implement a constant search function in Solidity or to transfer the data into a javascript array each time to then search in it?
Thank you!
3
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0
answers
144
views
Is there any reference on writing contracts directly with the bytecode language?
It would be great to have a complete reference of all the opcodes available, their exact effects and costs, and an example "Hello World" in ethereum assembly.
Edit: this question isn't a duplicate of ...
- 3,177
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96
views
Solidty Browser doesn't load properly
Solidity Browser doesn't load anymore.
Here is a screenshot with the Chrome Developer open.
on Chrome Version 52.0.2743.116 m
It's stuck on loading and I see in developer some error messages.
It ...
- 295
3
votes
0
answers
106
views
Contribute function of crowdsale is not working
I am having a crowdsale contract. I am trying to run contribute function using command: contractInstance.contribute.sendTransaction(101,{from:eth.accounts[0],value:200, gas:4000000}). It is creating a ...
- 3,515
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votes
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answers
152
views
How are strings coerced into uint?
I executed a call checkConstant("ein schnitzel") on the following contract, and it worked. Obviously, type coercion but the documentation doesn't tell. How does this happen in detail?
contract X{
...
- 11.6k
3
votes
0
answers
253
views
Secure unit conversion in Solidity
Let's say you want mint a token TOK that is pegged to the USD. Then following must hold:
(1) TOKUSD = USDTOK = 1
(2) USDETH = 1/ETHUSD
(3) TOKETH = 1/ETHTOK
The formula of the exchange rate is
TOKETH =...
- 11.6k
3
votes
0
answers
707
views
Compile Smart Contract with Solidity on Windows 10
I wanted to use solidity within geth in Windows 10. I tried the compiled version that comes with Ethereum 1.0 but it has an issue mentioned in this thread.
I'd like to get a new binary of a newer ...
- 2,713
3
votes
0
answers
162
views
How to use an accessor for imbricated data types?
I'm looking at information about accessors in solidity/js for more complex data structures than just a public array/mapping.
How can i access the array in that code for:
struct AnotherStruct {....}
...
- 2,156
3
votes
1
answer
461
views
What is the maximum computation a query or constant function in solidity can perform?
Since query or constant functions are just executed on single node there is no dependency on gas or gas limit.
I am performing Quicksort in query/constant method. EVM can sort an array of length up to ...
- 927
3
votes
1
answer
990
views
Full Integration Testing smart contracts
What is the most agile way to fully integration test smart contract code? I've seen people use shell, etc. Is there a golden standard somewhere?
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3
votes
1
answer
3k
views
What is the burn() and burnFrom() function in EThereum Token Creation contract?
Please find the below ethereum token creation contract. It has two burn functions. It is having redendent params also.
Why it is placed, what is the importance of the functions.
pragma solidity ^0.4....
- 851
3
votes
2
answers
653
views
Keepers with VRF Error "Callback gas limit set too low error"
Im trying to create a dynamic nft by following the tutorial by alchemy, the NFT should update when performUpkeep is called which should get a random number using VRF v2 and change the NFT token URI.
...
- 56
2
votes
1
answer
14
views
Is it profitable for a miner to manipulate blocks in a small Ethereum project?
In the context of my blockchain project, I’m using the blockhash() function to generate randomness. However, I’m concerned about the potential vulnerability of this method. I’d like to know if, in a ...
- 21
2
votes
1
answer
20
views
Has Solidity Introduced Storage Optimization for Smaller Integer Types in Structs?
I am working on a project where storage efficiency is of utmost importance. Specifically, I have a scenario where I want to store an ID of type uint16 and a code of type uint8. The current plan is to ...
- 1,408
2
votes
1
answer
45
views
Transaction data is not a multiple of 32 bytes
My understanding is that in a transaction's input data, the first 4 bytes, i.e. 8 characters, is reserved for a function signature. The rest of the data, after processed by the API, will be fitted to ...
- 41
2
votes
0
answers
17
views
How ERC1155 can behave like ERC20?
As we say that ERC1155 can define both fungible and NFTs, how exactly is that implemented? The ERC has all the functions like an ERC721, and also it attaches a URI with all of the tokens, but ERC20 ...
- 53
2
votes
0
answers
84
views
Hardhat public network fork: Error calling view functions with ethers.js on browser
I have my hardhat network configured as a fork of Binance Smart Chain like this:
const config: HardhatUserConfig = {
solidity: {
version: "0.8.0",
settings: {
optimizer: {
...
- 1,731
2
votes
0
answers
58
views
Is it possible for a function to revert if called by staticcall, and not revert if called with a state changing call?
I am trying to figure out if it is possible to write a function in either Solidity or Yul, or some combination thereof, which is capable of detecting when it is being called with staticcall and ...
- 157
2
votes
0
answers
79
views
Impossible to get my bundle include even with 20 eth as priority fees
Bundle was not included in target block.
Hello everyone, I hope you're all doing well. I'm currently attempting to execute a SwapExactETHForTokens transaction on Uniswap V2 using EIP-1559. When I try ...
- 21
2
votes
1
answer
16
views
Truffle console: How to print uint array
How to print uint array in Truffle's Java script environment?
Hi,
I am following the link:
Printing uint256 value to console while debugging with Truffle
I am working on truffle console environment ...
- 1,416
2
votes
0
answers
15
views
How to inherite modifier into multiple contracts ? Best practice?
I have a project with severals contracts.
To put some security, I've created a "onlyContract" modifier on a Roles contract so some functions in diferents contracts can only be called if the ...
- 21
2
votes
0
answers
11
views
How can i implement `MinimalBeaconProxy`?
I'm trying to make MinimalBeaconProxy. But seems like the assembly codes don't work. Can I get some advice of this codes?
Contracts
contract BeaconProxyCreator {
constructor(address beacon) ...
- 21
2
votes
0
answers
25
views
Seeking Recommended ECIES Libraries or Contracts for Solidity Development
Ethereum community,
I'm currently working on a Solidity project that requires the implementation of ECIES (Elliptic Curve Integrated Encryption Scheme) for encryption and decryption purposes. I wanted ...
- 21
2
votes
1
answer
84
views
Tool to re-create state of smart contract locally
I would like to be able to simulate transactions with smart contracts based on their solidity source code. The process should be entirely automated.
While I am aware that some tools allow forking the ...
- 21
2
votes
1
answer
256
views
Do we need OpenZeppelin's Counter with Solidiity 8 any more?
According to Solidity documentation:
Prior to Solidity 0.8.0, arithmetic operations would always wrap in
case of under- or overflow leading to widespread use of libraries that
introduce additional ...
- 1,731
2
votes
0
answers
74
views
Can not sign transaction with signer get from mnemonic
I'm writing test for MAX_SUPPLY of this function
// contract.sol
function mintStandard() public payable whenNotPaused {
require(
_standardCounter.current() <= 2222,
&...
- 33
2
votes
0
answers
187
views
Question on foundry
I am using foundry, I am new in it, I am noticing one thing that whenever I delete or install any package I am having to add commit, is it nature of foundry?
- 665
2
votes
1
answer
135
views
Where can I get simple implementation of ERC 4337?
I read about https://eips.ethereum.org/EIPS/eip-4337 few months ago.
Now, I want to start implementing it for a project .
Is there any beginner friendly repository from where I can understand this erc ...
- 358
2
votes
1
answer
28
views
Integrating smart contract with tweet
Is there a way to get a user to send out a tweet once an action on a smart contract happens without doing it on the server-side? And for the tweet to be sent out exactly once?
For example, listening ...
- 21
2
votes
1
answer
18
views
Query on typecasting in solidity
I am following uniswap v3 development book. We have a code:
pool = address(
new UniswapV3Pool{
salt: keccak256(abi.encodePacked(tokenX, tokenY, tickSpacing))
}()
);
My question is, ...
- 665
2
votes
1
answer
21
views
Help me to understand it
if (
_zeroForOne
? _sqrtPriceLimitX96 > _slot0.sqrtPriceX96 ||
_sqrtPriceLimitX96 < TickMath.MIN_SQRT_RATIO
: _sqrtPriceLimitX96 &...
- 665
2
votes
1
answer
101
views
How to send Wei to payable function with ethers
I want to send this function 1 wei using ethersJS while testing it on hardhat:
modifier payFee() {
bool sent = payable(address(this)).send(msg.value);
require(sent, "Didn't receive fee.&...
- 83
2
votes
0
answers
132
views
Using Brownie to verify contract error
I added sepolia with my infura api key to deploy my contract it works fine. Until I try to verify my contract with publish_source=True in FundMe.deploy function:
from brownie import FundMe
from ...
- 31