6、Solidity智能合约编程全解析

Solidity智能合约编程全解析

1. 智能合约结构

智能合约类似于类，包含状态变量、函数、函数修饰器、事件、结构体和枚举。同时，智能合约支持继承和多态。继承通过在编译时复制代码实现。

以下是一个智能合约示例：

contract Sample 
{ 
    //state variables 
    uint256 data; 
    address owner; 
    //event definition 
    event logData(uint256 dataToLog);  
    //function modifier 
    modifier onlyOwner() { 
        if (msg.sender != owner) throw; 
        _; 
    } 
    //constructor 
    function Sample(uint256 initData, address initOwner){ 
        data = initData; 
        owner = initOwner; 
    } 
    //functions 
    function getData() returns (uint256 returnedData){ 
        return data; 
    } 
    function setData(uint256 newData) onlyOwner{ 
        logData(newData); 
        data = newData; 
    } 
}