Calling Other Contract

调用其他合约

合约可以通过两种方式调用其他合约。

最简单的方法就是直接调用它，例如A.foo(x, y, z).

调用其他合约的另一种方法是使用低级call.

不推荐这种方法。

Contract can call other contracts in 2 ways.

The easiest way to is to just call it, like A.foo(x, y, z).

Another way to call other contracts is to use the low-level call.

This method is not recommended.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Callee {
    uint public x;
    uint public value;

    function setX(uint _x) public returns (uint) {
        x = _x;
        return x;
    }

    function setXandSendEther(uint _x) public payable returns (uint, uint) {
        x = _x;
        value = msg.value;

        return (x, value);
    }
}

contract Caller {
    function setX(Callee _callee, uint _x) public {
        uint x = _callee.setX(_x);
    }

    function setXFromAddress(address _addr, uint _x) public {
        Callee callee = Callee(_addr);
        callee.setX(_x);
    }

    function setXandSendEther(Callee _callee, uint _x) public payable {
        (uint x, uint value) = _callee.setXandSendEther{value: msg.value}(_x);
    }
}