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

 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】

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
		}
	}
]