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EvmStack.sol
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EvmStack.sol
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pragma solidity ^0.4.18;
/**
* @title EvmStack
* @author Nathanael Esayeas (github.com/nathane)
* @dev Stack implementation written in solidity.
*/
contract EvmStack {
/**
* @dev The contract owners address
*/
address public owner;
/**
* @dev The stack
*/
string[] public stack;
/**
* @dev EvmStack constructor
*/
function EvmStack() public payable{
owner = msg.sender;
}
/**
* @dev Removes all elements from the stack.
* @return bool
*/
function clear() public returns(bool success){
require(stack.length > 0);
delete stack;
stack.length=0;
return true;
}
/**
* @dev Returns the top most elements in the stack, but doesn’t delete it.
* @return string
*/
function peek() constant public returns (string){
require(stack.length > 0);
return stack[stack.length-1];
}
/**
* @dev Returns and deletes the top most element in the stack.
* @return string
*/
function pop() public returns (string) {
require(stack.length > 0);
string memory value = stack[stack.length-1];
delete stack[stack.length-1];
stack.length -=1;
return value;
}
/**
* @dev Adds an element at the top the stack.
* @param value added to stack
* @return bool
*/
function push(string value) public returns(bool success){
stack.push(value);
return true;
}
/**
* @dev Returns the number of elements in the stack.
* @return uint
*/
function size() constant public returns (uint) {
return stack.length;
}
/**
* @dev Returns whether the stack has any elements.
* @return bool
*/
function isEmpty() constant public returns (bool) {
return stack.length == 0;
}
/**
* @dev Kills the contract and returns remaining funds back to the creator
* @return bool
*/
function rip() public returns(bool success){
require(msg.sender == owner);
selfdestruct(owner);
return true;
}
/**
* @dev Fallback function
*/
function () public payable{}
}