In this post, we will learn how to create or instantiate a new contract using the “new” keyword in Solidity Language.
Advertisements
Notice: This is one of the multi-post series of Learn Solidity - Build Decentralized Application in Ethereum. This is an attempt to teach you all about Solidity - A Programming Language for Ethereum Based Smart Contracts. If you want to take this as a video course please signup using below button.
pragma solidity 0.4.8;
/*
* @title Example the for Solidity Course
* @author Ethereum Community
*/
// A contract can create a new contract using the new keyword.
// The full code of the contract being created has to be known in advance,
// so recursive creation-dependencies are not possible.
// lets define a simple contract D with payable modifier
contract D {
uint x;
function D(uint a) payable {
x = a;
}
}
contract C {
// this is how you can create a contract using new keyword
D d = new D(4);
// this above line will be executed as part of C's constructor
// you can also create a contract which is already defined inside a function like this
function createD(uint arg) {
D newD = new D(arg);
}
// You can also create a conract and at the same time transfer some ethers to it.
function createAndEndowD(uint arg, uint amount) {
// Send ether along with the creation of the contract
D newD = (new D).value(amount)(arg);
}
}
