Ethereum: Struct array issue and how to test using Remix – ArrayTest.swapDataStruct does not yet support copying structured memory of type memory[] to storage.

Here is an article that explains the problem and provides guidance on how to test your Solidity contract using Remix:

Understanding the error: Copying memory of type struct ArrayTest.swapDataStruct[] does not yet support storing memory

When you try to assign an array of structures (e.g., memory[]) to a variable in your contract (ArrayTest.swapDataStruct), you encounter a problem. The error message suggests that the compiler is unable to copy this array to the underlying storage (i.e., the Ethereum blockchain).

This problem arises because Solidity, like other programming languages, has a strict type checking mechanism. When you declare a struct array (memory[] ArrayTest.swapDataStruct;), it essentially tries to assign a value to memory location 0x00. However, in most Solidity contracts, the memory locations are not yet allocated until the ‘swapDataStruct’ function is called.

Testing with Remix

To test your contract using Remix, you will need to create a test instance of the contract and call its functions from within a test script. Here is an example of how you can modify your contract to address this issue:

pragma density ^0.8.0;
import "
Contract ArrayTest {
// ... existing code ...
function swapDataStruct() public {
memory[] memory array = new memory[1];
swapDataStruct(array);
}
function swapDataStruct(memory[] memory data) internal {
for (uint256 i = 0; i < data.length; i++) {
data[i] = 10;
}
}
}

In this example, we have created a swapDataStruct function that takes an integer array (memory[]) and returns a value for each element. We will then use the ArrayTest.swapDataStruct function to call this new function.

Testing with Remix:

To test your contract using Remix:

• Create a new Solidity project in Remix.

• Import the ArrayTest contract and create a new contract instance (ArrayTest.sol).

• Compile the contract (e.g., use the commandsolidity-coverage compile –minify –nohex ArrayTest.sol).

• Run the contract usingremix run –network mainnet’.

You should now be able to call your contract’s functions from within a test script.

const {init} = require('./ArrayTest');
module.exports = {
async test() {
const instance = wait init();
console.log(instance.swapDataStruct()); // print[10]
}
};

By following these steps and using Remix to compile and run your Solidity contract, you should be able to successfully assign an array of structures to a variable in your contract and access its contents.

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