solidity以太坊合约之继承【父类的构造函数会不会直接调用】总结

痛定思痛。 2021-09-19 16:30 629阅读 0赞

### ** solidity以太坊合约之继承【父类构造方法都会强制执行】** ###

**无参构造方式：使用is继承即可，无需重新指定**

**有参构造方式：使用is继承之后，还需要指定参数【两种参数初始化方法】**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70][]

pragma solidity >=0.5.0 <0.7.0;
    
    
    contract A  {
        event LogA(string test);
        constructor() public {
            emit LogA("执行了A合约");
        }
    }
    
    contract B is A  {
        event LogB(string test);
        constructor() public {
            emit LogB("执行了B合约");
        }
    }
    
    contract X {
        event LogD(string test);
        constructor() public {
            emit LogD("执行了X合约");
        }
    }
    
    contract C is B,X  {
        event LogC(string test);
        constructor() public {
            emit LogC("执行了C合约");
        }
    }

### **合约部署后执行结果【父类构造函数全部执行】： ** ###

[
    	{
    		"from": "0xef55bfac4228981e850936aaf042951f7b146e41",
    		"topic": "0x2c97ef1bf565d0aa27910658d6868f60344c016f7d84ccec59549e8780043d34",
    		"event": "LogA",
    		"args": {
    			"0": "执行了A合约",
    			"test": "执行了A合约",
    			"length": 1
    		}
    	},
    	{
    		"from": "0xef55bfac4228981e850936aaf042951f7b146e41",
    		"topic": "0xbc227f4cc6bf66a4720ae5c43efba09560823aa859c6f6afb05549a257b2db85",
    		"event": "LogB",
    		"args": {
    			"0": "执行了B合约",
    			"test": "执行了B合约",
    			"length": 1
    		}
    	},
    	{
    		"from": "0xef55bfac4228981e850936aaf042951f7b146e41",
    		"topic": "0xdf68300bec9878a850aecba9659afb363f9a69b0a67b57d69c7eddd2b66fb855",
    		"event": "LogD",
    		"args": {
    			"0": "执行了X合约",
    			"test": "执行了X合约",
    			"length": 1
    		}
    	},
    	{
    		"from": "0xef55bfac4228981e850936aaf042951f7b146e41",
    		"topic": "0x07093231bee6b246869b33e85368e0a59341a93fcf169eb12eeed1705aedb1fb",
    		"event": "LogC",
    		"args": {
    			"0": "执行了C合约",
    			"test": "执行了C合约",
    			"length": 1
    		}
    	}
    ]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70]: /images/20210812/2b293cd7812c4183a276548db2a464ed.png