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16_Constructor.sol
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16_Constructor.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
contract MyContract {
uint a;
address admin;
//Constructors can only be called once when the smart contract is deployed.
constructor(uint _a) {
//Initialize variables of your contract
a = _a;
admin = msg.sender;
// you can call other functions from the constructor, but not the other way around.
contractInit();
}
function contractInit() public {
//do something
}
//admin is used to protect functions that should be called only by specific addresses
//You can also use the keyword 'internal' for the constructor
//This means that the contract cannot be deployed directly, but it can be called from another contract.
}
//Contract inheritance
contract MyParentContract {
constructor(uint a) {
//do stuff
}
}
contract MyChildContract is MyParentContract {
uint a;
address admin;
constructor(uint _a, address _address) MyParentContract(_a) {
//this can be empty or you can do additional stuff
a = _a;
admin = _address;
}
}