new创建其他合约的合约
Contract that Creates other Contracts
Contracts can be created by other contracts using the new keyword. Since 0.8.0, new keyword supports create2 feature by specifying salt options.
合约可以由其他合约使用关键字创建new。从0.8.0开始,关键字通过指定选项new支持功能。create2salt
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
contract Car {
address public owner;
string public model;
address public carAddr;
constructor(address _owner, string memory _model) payable {
owner = _owner;
model = _model;
carAddr = address(this);
}
}
contract CarFactory {
Car[] public cars;
function create(address _owner, string memory _model) public {
Car car = new Car(_owner, _model);
cars.push(car);
}
function createAndSendEther(address _owner, string memory _model) public payable {
Car car = (new Car){value: msg.value}(_owner, _model);
cars.push(car);
}
function create2(address _owner, string memory _model, bytes32 _salt) public {
Car car = (new Car){salt: _salt}(_owner, _model);
cars.push(car);
}
function create2AndSendEther(
address _owner,
string memory _model,
bytes32 _salt
) public payable {
Car car = (new Car){value: msg.value, salt: _salt}(_owner, _model);
cars.push(car);
}
function getCar(
uint _index
)
public
view
returns (address owner, string memory model, address carAddr, uint balance)
{
Car car = cars[_index];
return (car.owner(), car.model(), car.carAddr(), address(car).balance);
}
}