Questions tagged [struct]
Question about the solidity Structs
250
questions
0
votes
1answer
23 views
Cant Retrieve the values of Structure fields (i.e. text boxes) through Remix IDE
I am giving the values to structure field through Remix IDE, then I am putting ‘0’ as the index of people array, then I click transact and then I click call, but Remix does not show me the value I ...
0
votes
1answer
22 views
What is the differenc between Person and Account variables
What is the difference between Person and Account?
struct Account {
address addr ;
uint balance ;
}
Account[ ] public accounts;
function applyInterest () public returns ( uint ) {
for ( ...
0
votes
1answer
19 views
Problem with understanding contract containing array of structure
I got the following code for a contract from a Solidity tutorial website:
pragma solidity 0.5.1;
contract MyContractPersonStruct {
Person[] public people;
uint256 public peopleCount;
...
0
votes
1answer
22 views
How to properly initialize nested storage array/struct?
contract Contract {
struct A {
int a;
}
struct B {
A[] as;
}
mapping(address => B[]) bs;
function addB(B memory b) {
bs[msg.sender].push(...???...);
}
}
I have nested hell of arrays and ...
0
votes
0answers
19 views
Accessing a storage array is causing my contract to revert with no explanation
I have the following contract:
// Inspired by https://fravoll.github.io/solidity-patterns/eternal_storage.html
pragma solidity ^0.5.8;
import "./lib/Ownable.sol";
import "./MemberStruct.sol";
...
0
votes
1answer
8 views
Can you have an array of mappings? The mappings have an address key and a struct value
Can you have an array of mappings?
I want to have mappings with addresses as keys and structs as the value.
I want to store these addresses in an array and iterate through them.
so far it looks like ...
0
votes
1answer
23 views
Passing of a struct array from called contract to calling contract
I am currently developing a dAPP and I am splitting it in 2 distinct contracts. I will be calling functions from contract A to contract B. In contract B I have an array of struct which I can ...
1
vote
2answers
20 views
Remove empty space in a Struct
Once I do cancel some data from a struct, how do I remove the empty cells that I then create? Sorry for the silly question but I am just new :)
Below you will see "function removeAppointment" where, ...
0
votes
1answer
17 views
Passing array of struct as parameter: Only libraries are allowed to use the mapping type in public or external functions
I am trying to push multiple items to the array of structs in the contract. Couldn't find a clear answer if it is possible to pass an array of struct as a parameter.
Apparently I can't but I get a ...
0
votes
1answer
34 views
Size limit to number of items in a struct
If I loop over mapping into a struct the gas fee is very low. However, in trying to test its limits, the EVM often causes Remix to crash in creating edge cases, because I'm creating blocks of 50 new ...
0
votes
1answer
50 views
How to use array of arrays with mapping in Solidity
I'm developing a smart contract handling document signing. Mainly, there are two things to consider 1) Signers 2) Sign Types.
1) Signers: Mandatory sign the document
2) Types: Types of signs such as ...
1
vote
1answer
59 views
Accessing struct fields from assembly block
Say we have the following structure:
struct MyStruct {
uint256 x;
uint256 y;
}
and that it is passed as an argument to some function. Inside that function, we have assembly block from where we ...
0
votes
1answer
18 views
Deleting vs. Assigning to Default Values
If I have a struct with many customer accounts:
bytes32[] public customerID;
mapping(bytes32 => CustomerAccounts) public customerAccounts;
struct CustomerAccounts{
address customer;
uint ...
1
vote
1answer
39 views
Add Number to Item in all Struct Members
I have a struct where I want to increment an item across all struct members. For example, say there is a struct 'Contract', and new customers get their own bytes32 ID, which points to their own struct:...
0
votes
1answer
43 views
Stack too deep problem
I try to add more property to the scenario struct but when I run the compile the same error appear:
struct Scenario {
uint id;
address payable author;
address editor;
...
0
votes
1answer
26 views
Check if Struct already exists in array of structs
I am new to solidity. I have a struct and an array of structs, like this:
struct Adopter{
uint age;
uint gender; // 0 woman, 1 man
// maybe add an id field
}
Adopter[] adopters;
So, a ...
0
votes
1answer
25 views
Solidity. Check if key has value in mapping. Operator != not compatible with types struct
I am new to solidity. I have a Person struct and mapping:
struct Person{
uint age;
string gender;
}
Person[] players; // holds the 24 players
mapping (string => Person) ...
0
votes
1answer
15 views
Solidity. Return a Sruct that lives inside an array
I am not sure how to return a struct that is inside an array of structs. This is my code:
contract StudentsInfoTracker{
Student[] students;
struct Student{
string name;
...
2
votes
1answer
35 views
What size is an enum member inside of a struct
Let's consider the following code:
pragma solidity ^0.4.18;
contract Test {
enum EnumTest {
Test0,
Test1
}
struct StructTest {
EnumTest Foo;
uint256 Bar;
}
}
Not taking ...
1
vote
1answer
75 views
Vyper mapping inside a struct
Is it possible to have a mapping inside a struct for vyper? For example:
struct Teddy:
id: uint256
year: uint256
component: map(uint256, uint256)
teddies: private(map(uint256, Teddy))
...
0
votes
1answer
67 views
How to save data using multiple structures and arrays in solidity?
How can i use multiple arrays please?
e.g: I have this contract:
pragma solidity >=0.4.21 <0.6.0;
contract SessionManagement {
struct ChargeProfileSegment{
uint startDateTimeSeg;...
2
votes
1answer
142 views
VM error: revert. revert The transaction has been reverted to the initial state. Note: The called function should be payable if
Hi Guys 👋
I have two contacts first one is SubToken and second one is MainContract.
First I deploy MainContract after that I use createNewContract function and I create new SubToken.
and then
I ...
1
vote
1answer
21 views
Trouble accessing an array inside a struct inside a mapping via web3
Here are a few relevant code snippets from my smart contract
struct Constituency{
uint16 id;
string name;
uint64[] cans;
}
mapping(uint => Constituency) public constituencies;
...
1
vote
1answer
40 views
Are memory variables initialized by solidity?
I've the following struct
struct Vote {
uint amount;
uint count;
}
Is it initialized when allocated in memory?
function boofar(uint val) public {
Vote memory result;
result.amount += val;
}
...
0
votes
3answers
27 views
Struct creates instances with zero values for all of it properties instead of using function arguments
Inside my smart contract I have a struct type NotaryEntry and a function addNotaryEntry which creates an instance of the struct and add to a mapping, I do pass the right values to the function but the ...
0
votes
1answer
53 views
Return an array of structs using events?
I wan’t my function to spit out an array of structs. I know this is not straightforwardly possible. What is the best way for me to proceed? Should I loop through my array in my function and trigger ...
0
votes
1answer
159 views
Member “name” not found or not visible after argument-dependent lookup in string storage ref
I have code like this and I want to set my name, surname and age in my struct so I want to set them and get them using with my functions
here's my code :
pragma solidity >=0.4.0 <0.7.0;
...
1
vote
1answer
55 views
Which is faster: loop inside contract or loop of transactions?
I have this contract:
pragma solidity 0.5;
pragma experimental ABIEncoderV2;
contract TestStruct {
struct User {
string name;
uint256 age;
}
mapping (bytes32 => ...
0
votes
3answers
297 views
ParserError: Expected ',' but got identifier
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
struct kullanicilar{
string name;
string surname;
uint age;
}
event infoChanged(
string name,
...
1
vote
1answer
116 views
How to pass struct params in remix ide?
I have this smart contract:
pragma solidity 0.5;
pragma experimental ABIEncoderV2;
contract TestStruct {
struct User {
string name;
uint256 age;
}
mapping (bytes32 =&...
0
votes
1answer
293 views
Type string memory is not implicitly convertible to expected type struct InsanFactory.User storage ref
pragma solidity >=0.4.0 <0.7.0;
contract InsanFactory{
struct User{
string name;
address myaddress;
}
mapping(address => User) public userStructs;
...
1
vote
0answers
73 views
How to pass a struct as an argument in call using web3.py
Following is a working code on remix. It is recommended to use memory keyword for the struct parameter.
Please also see: Solidity Storage Array Bugs
Which does not work on Web3.py and gives the ...
3
votes
2answers
97 views
returning the struct value in smart contract and experimental ABIEncoderV2
I am storing and returning the struct value by using mapping.
pragma solidity >=0.5.0 <0.7.0;
pragma experimental ABIEncoderV2;
contract Manage{
struct Policy{
string PolicyID ;
}
...
0
votes
1answer
34 views
Web3 event listener - timing issue when immediately retrieving contract values
I'd like to be able to immediately get a struct value from a mapping after calling a function that updates the struct, however, when testing with Ganache, sometimes the event arrives to the listener ...
0
votes
2answers
92 views
How to access content of mapping in a struct?
I'm aware of this post:
Accessing a mapping within a struct via Truffle console
However, it seems to me, it does not provide a clear answer. Also, my question is more generic and not just for ...
0
votes
2answers
70 views
Initialize an array of struct within a struct
I am working on a use case of "Purchase Order" wherein there will be multiple Products listed/ordered under one Purchase Order(PO) by a buyer.
1 PO : N Products
struct Product{
bytes32 ...
0
votes
1answer
37 views
Storing geo location in contract
I am beginner in solidity programming, I am trying to write my first contract. I am trying to store a piece of land (which is array of coordinates) against a person. I am having trouble storing the ...
0
votes
1answer
25 views
How can I pass struct as function parameter with ABIEncoderV2 from outside?
have this code:
struct UserScore {
address user;
uint score;
uint time;
}
function getWithStruct(UserScore _user) public view returns (address, uint, uint) {
return (_user.user, _user....
0
votes
1answer
173 views
How can I send array of structs as arguments?
I want to send to my contract an array of currency and its price so it will store it:
pragma solidity ^0.4.24;
contract ExchangeContract {
enum CurrencyType { USD, TWOKEY, BTC, ETH, DAI, USDT, ...
0
votes
0answers
12 views
How to return a struct which contains another struct?
I'd like to return a struct which contains another struct.
When calling the function, I want to make the return result likely to
0:string: Username
1:string[]: [[a.doc,...
1
vote
1answer
66 views
Struct member access in web3 requires additional dummy field
If a struct contains a single field, then that field is inaccessible from web3. In the below example, field uint b must also be present in order to access field uint c from web3.
Of course, it's not ...
2
votes
3answers
156 views
Should I use require in view functions?
When I call a solidity function to get a struct element, is it a best practice to use require and check if the element exists or should I just return the empty values?
Without require:
function ...
3
votes
0answers
67 views
One-to-many mapping inside struct
I have two structs:
struct A{
uint bid;
mapping(uint => B[]) BMap; //bid - index for struct B
}
struct B{
uint cid;
}
mapping(uint => A[]) AMap;
How can we push and fetch 'cid' ...
0
votes
0answers
85 views
How should I pass a nested struct as a function argument in Remix IDE?
Example contract:
pragma solidity ^0.4.24;
pragma experimental ABIEncoderV2;
contract someContract {
struct structOne {
uint a;
}
struct structTwo {
uint b;
...
0
votes
2answers
553 views
Default getter and setter for mapping in solidity
In my smart contract I've public mapping as mapping (uint=>User) public users where User is a Struct, so is there any way to get the values of this mapping using default getter.
For Example : If ...
0
votes
1answer
217 views
Invalid type for argument in function call. Invalid implicit conversion from mapping
I have defined struct for saving data to ethereum blockchain. I am using uint to map the data stored with a unique ID. I am using truffle framework to write smart contracts with solidity version: 0.4....
1
vote
1answer
17 views
Use Values Returned from One Function in Another
need a little help if you can spare the time.
Making a little card game where people can collect "warrior" cards.
We'll have an initial 12 master "cards" that supply the initial traits for the ...
0
votes
1answer
71 views
Pushing a stuct into an array
What i am attempting to do is elementary, adding a struct to a storage array. But for some reason I am getting the following error
TypeError: Indexed expression has to be a type, mapping or array (...
0
votes
1answer
26 views
Read storage struct from a modifier
If i read a struct(storage) Human storage human = humans[2]; in my modifier is there a possibility that the function that uses this modifier can use the "human"? Otherwise i have to scope the storage ...
2
votes
1answer
63 views
Passing in an array of complex structs
I am wondering what pattern I am supposed to follow in Solidity to take in an array of structs as a parameter. I am translating code from CPP and mostly everything translates directly besides this (...
