Ethereum: Can we encode a Calledata structure by calling another feature?
During Ethereum, you can accept arguments in several ways to call another function of the contract. However, one normal restriction is that the type of data we can transfer to the functions cannot be encoded by a direct Calldata. This is because Calledata protects memory values and requires them to be a specific type that may not match the types of data transmitted to the function.
In this article, we will investigate whether it is possible to encode a Caldata structure (i.e. object) when calling for another feature in Ethereum.
Problem: Coding
Let’s consider the example that is proven at the beginning. We have a Structure price and the “Ispricekay” feature, which take the “call price” argument:
`Solidarity
Structure price {
the meaning of Uint;
}
Function Is Pricekay (Price Calldata Price) Public Pure Return (BOOL) {
Back ...
}
Note how we are trying to convey the entire copy of the structure (“price”) as an argument. However, Solidity, when you want to pass on a specific type of object (such as Structure Price), you can use the Value field in memory.
Unfortunately, by calling the other function of the contract using Calldata, we cannot simply assign the total specimen of the total structure of Caldata. Instead, we need to use indexing and task combination to achieve this.
Solutions: Indexing and Tasks
Here are two common solutions that allow us to encode a Calldata structure when you call for another feature:
1
`Solidarity
Structure price {
the meaning of Uint;
}
Function is the ISRICEKAY (price [] memory price) in public pure return (bool) {
Back ...
}
Defining the “price” array equal to the number of “price” structures we want to encode, we can access each element using its arrow (0", "1", etc.). However, this method still needs manual indexation and assignment function during a call.
- Using Data Keyword : We can also use the "data" key word "solidity 0.6.0" and later versions to keep the values directly "calldata". This allows us to define a structure -like data structure when each element is stored as honest, not as separate variables:
Solidarity
Structure price {
the meaning of Uint;
}
Function is the ISRICEKAY (price [] memory price) in public pure return (bool) {
Back ...
}
In this case, we can simply convey the “price” argument directly at Caldata without any indexation or assignment:
`Solidarity
contract with my contract {
Function MyFUNCTION () public pure return () {
// pass the price as an argument here ...
ISRICEOKAY (price);
}
}
However, keep in mind that using the “data” input is additional complexity and may not be the best approach to all cases of use.
Conclusion
In conclusion, while technically it is possible to encode a Calledata structure when you call another Ethereum contract, you need to carefully consider indexing, assigning or using solutions such as a “data” keyword. These methods can be useful in specific scenarios when you need to store complex data structures directly in calls.
When deciding whether to use these solutions, consider factors such as:
- Data size and structure you are trying to encode
- The productivity of your contract and the needs of gas efficiency
- The complexity and readability of your codenal base
After all, before choosing the best solution for a particular case of use, it is necessary to weigh the advantages and disadvantages of each approach.
