Questions tagged [solidity-0.5.x]

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. Solidity version 0.5.0 is a specific version that includes a number of changes to the language and introduce new features.

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How to ensure that a string parameter to a function is not empty?

Lets say that I have a function which needs two string parameter , function data(string memory _firstname, string memory _lastname) public { buyer[msg.sender] = Buyer(_firstname, _lastname); } Now, I ...
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1answer
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Gas fee optimization questions [duplicate]

Can some recommend a way to save gas fees? a = a + 1; a++; I heard about this; Pack struct tightly Mine looks like this. I am not sure about size of address, ENUM variables and array without length. ...
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Validation of integers on solidity

I have this function and require the _price variable to be positive, But when I pass a negative int, it accepts the integer! How can I validate the input? The Contract : function createProduct(string ...
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error when I run truffle test

TypeError: Cannot read property 'call' of undefined at Context. (test/TdetayProofTest.js:18:74) here my test: var TdetayProof = artifacts.require("./TdetayProof.sol"); contract('TdetayProof',...
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What is the purpose of EVM tags, their haphazard arrangement and their relationship to functions?

I want to understand the purpose of tags in EVM assembly and their relationship with Solidity function. pragma solidity ^0.5.1; import './Mod.sol'; contract MOFTest{ ModifiedBank mb; ...
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How to I initialise an array inside the contructor in solidity?

I'm using the remix IDE.I want to define the size of the array at the time constructor is called. Someone please help. This is what I tried : pragma solidity >=0.7.0 <0.8.0; contract Vote { ...
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50 views

What's wrong with my buyToken function?

Here is my solidity interface IERC20 { function decimals() external view returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external ...
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1answer
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require(msg.sender.call(“”)): No matching declaration found after argument-dependent lookup

I am trying to compile the following Solidity program: pragma solidity ^0.5.9; contract Mutex { bool locked; modifier noReentrancy() { require(!locked); locked = true; ...
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Remix: ParserError: Expected pragma. import directive, or contract/library/interface definition

I'm trying to use Remix to interact with a suite of contracts. One of the contracts being used is OpenZeppelin's Ownable contract. I copied from the link above, and pasted it into Remix, with a few ...
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Issuing 1-1 eth for token problem

pragma solidity 0.6.6; // import "./XYZToken.sol"; contract Vault { mapping(address => uint256) balanceOf; mapping(address => bool) hasDepositedEther; mapping(...
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1answer
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Transfer funds to inherited smart contracts [closed]

How would I make this work - the balanceOf[Pool, System + Cube] doesn't seem to work ;-; // SPDX-License-Identifier: GPLv2 pragma solidity ^0.7.0; import "./Pool.sol"; import "./Cube....
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Solidity 0.5.0, issue related to transfer function

I am using the transfer function to transfer some balance to an address based on reward scenario. Now the issue i get is, when comparing the balance of the address as well as contract before and after ...
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1answer
66 views

Using inherited constructor in Solidity >=0.5.0

I want to use a contract inherit from another contract and use the parent constructor after using another commands in inherited constructor. So I wrote: pragma solidity ^0.5.10; contract A { ...
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How to call the super contract function where msg.sender should be same in solidity?

I am trying to call contract A.fun_A() via Contract C contract A{ function fun_A(address tenant, uint itemId){ //Here the msg.sender should be msg.sender in C require(msg.sender == ...
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Get a blank address

I have a little problem with my code. I'm trying to follow who are the current sender and the previous sender of a transaction respectively with the variable currentSender and lastSender, and then ...
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1answer
42 views

Getter of mapping inside a struct

I wanted to create a getter function to access a mapping nested inside a struct. But the function that I made required me to use the expiremental version (I'm on Remix). So I used the expiremental ...
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1answer
32 views

Else if structure gives the wrong output

I have a little problem with a else if struture that doesn't give out the right result. Here is the code: pragma solidity >=0.5.16; contract SupChain{ enum StateType {A, B, C} ...
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22 views

Negative integer function

I have the following problem, one of my function has a variable where the uint can be negative but I don't know of that before the user enter in the form the integer. How do I settle this problem ? ...
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1answer
339 views

Warning! Error encountered during contract execution [execution reverted]

I have an ERC20 Mintable+Burnable Token created on solidity 6.11 and a sale contract on solidity 5.0 I am getting error when i send ETH to the sale contract. https://rinkeby.etherscan.io/tx/...
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1answer
75 views

Flashloan callFunction being called internally

I had a chance to look at this contract. contract Flashloan is DyDxFlashLoan { uint256 public loan; constructor() public payable { (bool success, ) = WETH.call.value(msg.value)("&...
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1answer
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Different compiler versions in OpenZepplinn ERC721 folder

We have created a contract by inheriting ERC721Burnable, Ownable contract from openzepplin. The compiler version we are using in our smart contract is 0.6.0. I flattened the smart-contract by using ...
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1answer
98 views

How to get require() error message?

I can see the error message on Etherscan. But I can't find it in getTransactionRecept(). Is there any special settings that I need set in my Genesis.json before I can see it?
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1answer
42 views

Is it true that we can't make multiple Transfer() to the same address within a single transaction now?

The code below is for illustrative purposes only. Not the actual production code. function payCommission(address[] payee) public payable { for (uint i = 0; i < payee.length; i++) payee[...
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2answers
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Couldn't understand the logic behind code for mulitdeed payout contract

While searching on the web I came across this page the user has created multiple examples of solidity smart contract On multiple payout deed smart contract I can't understand this line duePayouts = ...
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41 views

Polymorphism in Solidity

I understand that Solidity supports contract polymorphism, but what pattern would one use to create abstract data types for use in derived contracts? Motivating example: Say I have an abstract Storage ...
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1answer
20 views

Compilation Eror: One contract accessing the variable of another contract

I am trying to compile two contracts. I am getting 'balance' variable error in "HoneyPotCollect.sol" contract. Is balance not a global contract variable? Somebody please guide me how to ...
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Truffle + Infura Mainnet deploy. Transactions never get mined, timing out after 750 seconds

The contract deploys on Rinkeby without a hitch, but when it comes to mainnet it is erroring out strangely. Infura's HTTP endpoint was giving me Invalid JSON RPC RESPONSE "", so I decided to ...
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1answer
81 views

Why solidity doesn't use “ Null ” and “undefined”?

Like Python or any other language why does Solidity avoid having the Null and undefined properties?
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1answer
31 views

Why does Solidity not use the years keyword?

Solidity has keywords like seconds, minutes, hours, days and weeks that are used to specify units of time. Why do they not have years?
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How to make my contract balance as private in Ethereum?

Suppose there are two contracts, A and B. Obviously, balance of A is public and B can read it with address_of_A.balance. Is there a way to make balance of A as a private data and B can't read it with ...
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1answer
263 views

Data location can only be specified for array, struct or mapping types, but “memory” was given

I am new to solidity. I was trying to compile the following code in chrome browser with Remix. I am getting the following error "Data location can only be specified for array, struct or mapping types, ...
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1answer
41 views

Problem: Payment between smart contracts without reducing the balance of the sender contract

I work on Truffle. I have two smart contracts A and B. Codes of them are same. A should transfer some ether to B and store some information about this payment. I funded A with METAMASK. But, whenever ...
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1answer
48 views

delegatecall method - calling context is not being set

We have an issue with delegatecall method. We want to call contract C2 from C1 (which is supposed to be a pass through contract for the user wallet). When we are calling C2 via C1 even using ...
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1answer
44 views

Receiving error while getting state variable value after using selfdestruct method “Error: Returned values aren't valid, did it run Out of Gas?”

I am using selfdestruct method and passing the payable address to it but receiving the following error when trying to get the value of a state variable : "Error: Returned values aren't valid, did it ...
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50 views

Transaction halted with a RUNTIME ERROR

while debugging I encountered this error: There was no revert message. This may be due to an in intentional halting expression, such as assert(), revert(), or require(), or could be due to an ...
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1answer
26 views

When i call a function: Error: Returned error: VM Exception while processing transaction: invalid opcode

I work on Truffle. My contract is A and its function is infoRep(). infoRep() returns some data. Whenever i call the function in Truffle console the below error occurs: Error: Returned error: VM ...
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1answer
38 views

Delete mapping within a mapping

I have a mapping with the following structure: mapping(uint256 => mapping(address => SOME_STRUCT)) public submissions; delete submissions[uint256] is not allowed(compiler error). delete ...
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1answer
40 views

Explicit declaration, the “var” keyword is not allowed syntax error

While trying to compile this contract I'm getting a syntax error complaining about the "var" keyword being disallowed. How do I fix this? pragma solidity ^0.5.0; contract Courses { struct ...
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1answer
247 views

Openzeppelin Crowdsale

Ok so Ive found Openzeppelin a slightly easier Code to use, it explains better than Solidity does. But now my problem is the Math bit. Im no mathematician neither and cannot get my head around how it ...
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1answer
48 views

Contract inheritance to share same storage in Proxy pattern for upgradeability

Please bear with me here, I have been trying to figure it out myself but couldn't. I am trying to learn upgradeability with a Proxy pattern .https://blog.gnosis.pm/solidity-delegateproxy-contracts-...
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1answer
228 views

Factory contract to clone existing contracts

I am researching about Factory contract to clone existing contracts, First is the implementation present at https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol. I don't ...
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83 views

Deploy ERC725 Identity with ERC735 Claims

I am using ERC725v1 and ERC735 Interfaces to add a contract which can deploy an ERC725 based Identity contract that can hold an Identity key and further Add Claims from that Identity for the ...
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1answer
60 views

TypeError: Member “editor” not found or not visible after argument-dependent lookup in struct PrivateSmartContract.BuildingRental storage ref

I want to store user's wallet address array as editor's address so i created struct with array like following pragma solidity >=0.4.0 <0.7.0; pragma experimental ABIEncoderV2; contract ...
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1answer
221 views

How to get access to the storage mapping through the solidity assembler?

referencing the question How to get access to the storage array through the solidity assembler? I have been trying to figure out how to access the mapping (or variable y from the question). The ...
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1answer
363 views

Error: Cannot find module 'bignumber.js'

I'm trying to test this smart contract but I can't seem to get the beyond this error, I'm using the latest truffle suite v5.1.16, and web3 v1.2.6. KTokenSale.test.js const BigNumber = web3.BigNumber;...
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1answer
76 views

How to use solidity library with truffle

I'm using truffle V5.1.13 and when I run truffle test the res variable contains a transaction receipt rather than the expected 2. I notice if I remove everything that has to do with the library things ...
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36 views

Version Compatibility Issues Solidity v0.4 to 0.5 | Identity Contracts ERC 725 | abi.encodePacked not working

This is in reference to ERC 725 Identity Contracts. I am updating the contract to version 0.5. The issue arise in a specific function where it requires a single argument to the call method which I ...
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1answer
45 views

Transaction working in remix but not errored from dapp

I have a master contract which deploys instances of other contracts. pragma solidity ^0.5.0; pragma experimental ABIEncoderV2; contract DataEntityContract { DataEntity DE; constructor(...
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1answer
413 views

Explicit type conversion not allowed from “bytes32” to “address”

I am using solidity 0.5.0 when i compile code i am throwing exception as Explicit type conversion not allowed from "bytes32" to "address". code is working fine in remix IDE and my code is as ...
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1answer
182 views

How to get web3 to interact with smart contract to input string info

Just cannot get what seems like a simple input from html page to interact with a very simple contract to input data. Started off trying to make this tutorial work: Interacting with a Smart Contract ...