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Blockchain By Example

You're reading from   Blockchain By Example A developer's guide to creating decentralized applications using Bitcoin, Ethereum, and Hyperledger

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Product type Paperback
Published in Nov 2018
Publisher Packt
ISBN-13 9781788475686
Length 528 pages
Edition 1st Edition
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Authors (3):
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Xun (Brian) Wu Xun (Brian) Wu
Author Profile Icon Xun (Brian) Wu
Xun (Brian) Wu
Bellaj Badr Bellaj Badr
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Bellaj Badr
Richard Horrocks Richard Horrocks
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Richard Horrocks
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Toc

Table of Contents (13) Chapters Close

Preface 1. Say Hello to Blockchain FREE CHAPTER 2. Building a Bitcoin Payment System 3. Building Your Own Cryptocurrency 4. Peer-to-Peer Auctions in Ethereum 5. Tontine Game with Truffle and Drizzle 6. Blockchain-Based Futures System 7. Blockchains in Business 8. Creating an ICO 9. Distributed Storage IPFS and Swarm 10. Supply Chain on Hyperledger 11. Letter of Credit (LC) Hyperledger 12. Other Books You May Enjoy

Interface implementation – Ctontine contract

The next step is to define the main contract behind our game: Ctontine. In Solidity, when a contract implements an interface, the class agrees to implement all of its methods. Hence, if you miss implementing a function defined in the inherited interface, you’ll get the following error (in Remix):

As we do for inheritance, we use the is keyword to implement the interface, as follows:

contract Ctontine is Itontine {..}

Now, let's fill this empty contract. Within the preceding bracket, we start by declaring the following contract states:

    mapping (address => uint256 ) public Tpension;
Cplayer.player[] public active_players;
Cplayer.player[] public eleminated_players;
mapping (address => uint) public ping_time;
uint256 public Lindex;
Cplayer Tplayer:

Here are the contract states:

  • Tpension:...
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