特性——合约继承

Seven 2022-01-04 17:01:44
Categories： > Tags：

就像Java、C++中，类的继承一样，Solidity中，合约继承是扩展合约功能的一种方式。Solidity支持单继承和多继承。Solidity中，合约继承的重要特点：

示例

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
pragma solidity ^0.5.0;

contract C {
   //private state variable
   uint private data;

   //public state variable
   uint public info;

   //constructor
   constructor() public {
      info = 10;
   }
   //private function
   function increment(uint a) private pure returns(uint) { return a + 1; }

   //public function
   function updateData(uint a) public { data = a; }
   function getData() public view returns(uint) { return data; }
   function compute(uint a, uint b) internal pure returns (uint) { return a + b; }
}

//Derived Contract
contract E is C {

   uint private result;
   C private c;

   constructor() public {
      c = new C();
   }  
   function getComputedResult() public {      
      result = compute(3, 5); 
   }
   function getResult() public view returns(uint) { return result; }
   function getData() public view returns(uint) { return c.info(); }
}

附言

基础学习资料

与智能合约交互

源码

示例项目

调试工具

特性——事件
特性——库Libraries