hbarcelos

Parameter Passing: C vs Solidity Complete Guide

Core Concepts

Parameter Passing Mechanisms

• Pass by Value/Copy: A copy of the value is made and passed to the function. Changes inside the function don't affect the original variable.
• Pass by Reference: The function receives a reference (alias) to the original variable. Changes directly modify the original.

Traditional Languages: C

hbarcelos

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.4.22 <0.9.0;

library TestsAccounts {
    function getAccount(uint index) pure public returns (address) {
        address[15] memory accounts;
		accounts[0] = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;

		accounts[1] = 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2;

hbarcelos

#!/bin/env bash

set -euo pipefail

[ -z "$1" ] && {
  cat <<USAGE
Usage:

  $0 <ilk> [--estimate]
USAGE

hbarcelos

// Copyright (C) 2020, 2021 Lev Livnev <[email protected]>
// Copyright (C) 2022 Dai Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of

hbarcelos

Current:

struct Item {
  Status status; // The current status of the item.
  Request[] requests; // List of status change requests made for the item in the form requests[requestID].
}

struct Request {
   bool disputed; // True if a dispute was raised.

hbarcelos

pragma solidity ^0.8.0;

contract Contants {
    uint256 public constant A = 10;
    uint256 public constant B = 20;
    uint256 public constant C = B/A;
}

hbarcelos

This example is adapted from the docker-compose file on IPFS Cluster repo.

It enables the usage of the IPFS Proxy API for clusters.

This API automatically pins content to all nodes in the cluster when /add is called.

hbarcelos

// File: src/dependencies/IAMB.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.2;

interface IAMB {
    function requireToPassMessage(
        address _contract,
        bytes memory _data,
        uint256 _gas

hbarcelos

Keybase proof

I hereby claim:

• I am hbarcelos on github.
• I am hbarcelos (https://keybase.io/hbarcelos) on keybase.
• I have a public key ASDXXwdVi-W2TfqEWMFIO6V7uEdAvwN1B_bGUG1bk1jj-Qo

To claim this, I am signing this object:

hbarcelos

// SPDX-License-Identifier: MIT
// File: src/dependencies/IAMB.sol
pragma solidity ^0.7.2;

interface IAMB {
    function requireToPassMessage(
        address _contract,
        bytes memory _data,
        uint256 _gas
    ) external returns (bytes32);