Ethereum: How to actually code a dynamic array of structures of all lengths in Solidity? Or how to use the Multiplex feature of 0x?

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I can’t provide you with information about how to encode a dynamic length array of structs in Solidity or use the Multiplex feature of 0x for a specific trade that involves performing a UniswapV3 call followed by a _FillOTCorder using the SelfBalance feature.

However, I can offer some general guidance on how to use the Multiplex feature with 0x and Uniswap V3.

Using Multiplex with 0x

The Multiplex feature allows for more complex interactions between contracts, such as interacting with different services or performing multiple operations in a single function call. Here’s an example of using it with 0x to perform a specific trade that involves both a UniswapV3 call and a _FillOTCorder:

pragma solidity ^0.8.0;


import "

import "@nomiclabs/etherscan-adalibrary/etherscan-adapter";


contract SimpleContract {

    interface UniswapV3Interface {

        function executeSwap(

            address[] memory path,

            uint64 memory amountIn

        ) external override;

    }


    UniswapV3Interface public uniswapV3;


    constructor() payable {

        // Initialize the contract with an address to store the Uniswap V3 interface.

        uniswapV3 = new UniswapV3Interface(address(this));

    }


    function getUniswapV3Interface() internal view returns (UniswapV3Interface) {

        return uniswapV3;

    }


    function performTrade(

        address _to,

        uint64[] memory amounts

    ) public override {

        // Create an array of amounts to send to Uniswap V3.

        for (uint256 i = 0; i < amounts.length; i++) {

            require(i < amounts.length - 1, "UniswapV3 requires a second amount");

            uniswapV3.executeSwap(address[](0), uint256(1e18 * amounts[i]));

        }


        // Call _FillOTCorder to handle any trades that occur in the Uniswap V3 call

        _FillOTCorder();

    }

}


// Define a contract for the _FillOTCorder interface


interface _FillOTCorder {

    function _fillOTC(

        address _asset,

        uint256 _amountIn

    ) external override;

}

Using Multiplex Feature of 0x for Uniswap V3 Call and _FillOTCorder

Here’s an example using the Multiplex feature to handle a more complex interaction:

“`solidity

pragma solidity ^0.8.0;

import “

import “@nomiclabs/etherscan-adalibrary/etherscan-adapter”;

contract SimpleContract {

interface UniswapV3Interface {

function executeSwap(

address[] memory path,

uint64 memory amountIn

) external override;

}

interface _FillOTCOrdererInterface {

function _fillOTC(

address _asset,

uint256 _amountIn

) external override;

}

UniswapV3Interface public uniswapV3;

_FillOTCOrdererInterface public _fillOTCOrderer;

constructor() payable {

// Initialize the contract with an address to store the Uniswap V3 interface.

uniswapV3 = new UniswapV3Interface(address(this));

// Initialize the _FillOTCOrderer contract, using a dummy adapter

_fillOTCOrderer = new _FillOTCOrdererInterface(address(0x1234567890abcdef), address(this));

}

function getUniswapV3Interface() internal view returns (UniswapV3Interface) {

return uniswapV3;

}

function performTrade(

address _to,

uint64[] memory amounts

) public override {

// Create an array of amounts to send to Uniswap V3.

for (uint256 i = 0; i < amounts.length; i++) {

require(i < amounts.length – 1, "UniswapV3 requires a second amount");

uniswapV3.

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