78 lines
2.6 KiB
Plaintext
78 lines
2.6 KiB
Plaintext
/* https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/05_greeter.sol
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/*
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The following is an extremely basic example of a solidity contract.
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It takes a string upon creation and then repeats it when greet() is called.
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*/
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contract Greeter // The contract definition. A constructor of the same name will be automatically called on contract creation.
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{
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address creator; // At first, an empty "address"-type variable of the name "creator". Will be set in the constructor.
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string greeting; // At first, an empty "string"-type variable of the name "greeting". Will be set in constructor and can be changed.
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function Greeter(string _greeting) public // The constructor. It accepts a string input and saves it to the contract's "greeting" variable.
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{
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creator = msg.sender
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greeting = _greeting
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}
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function greet() constant returns (string)
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{
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return greeting
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}
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function getBlockNumber() constant returns (uint) // this doesn't have anything to do with the act of greeting
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{ // just demonstrating return of some global variable
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return block.number
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}
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function setGreeting(string _newgreeting)
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{
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greeting = _newgreeting
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}
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/**********
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Standard kill() function to recover funds
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**********/
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function kill()
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{
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if (msg.sender == creator) // only allow this action if the account sending the signal is the creator
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suicide(creator); // kills this contract and sends remaining funds back to creator
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}
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}
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*/
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contract Greeter =
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/* The creator of the contract will automatically
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be set in creator() by the transaction creating the contract. */
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function blockheight : unit => uint
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record transaction = { tx : string }
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record state = { greeting: string }
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record retval = { state: state,
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transactions: list(transaction)}
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let state = { greeting = "Hello" }
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let setGreeting =
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(greeting: string) =>
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state{ greeting = greeting }
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/* this doesn't have anything to do with the act of greeting
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just demonstrating return of some global variable */
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function getBlockNumber() = blockheight()
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/* There is no suicide functionallity in Sophia */
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function kill() =
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if ((caller() == creator()) /* only allow this action if the account sending the signal is the creator */
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&& (balance() > 0)) /* only creata a transaction if there is something to send */
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state{ transactions = [spend_tx(creator(), balance())] }
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else state
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