Dappsys 
Safe, simple, flexible building-blocks for smart-contract systems.
- Auth
-
ds-authds-guardds-roles - Token
-
ds-tokends-vault - Oracle
-
ds-cacheds-value - Util
-
ds-execds-mathds-noteds-proxyds-stopds-thing - Gov
-
ds-multisig
DSValue
Set and get a value
Authorized users can set and unset a value. Anyone can read the value.
Actions
peek
return the stored value along with boolean true if the value is set and false
if not
read
return either the stored value or an exception if not set
poke
set the value (requires auth)
void
unset the value (requires auth)
/// value.sol - a value is a simple thing, it can be get and set
// Copyright (C) 2017 DappHub, LLC
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.4.13;
import 'ds-thing/thing.sol';
contract DSValue is DSThing {
bool has;
bytes32 val;
function peek() public view returns (bytes32, bool) {
return (val,has);
}
function read() public view returns (bytes32) {
var (wut, haz) = peek();
assert(haz);
return wut;
}
function poke(bytes32 wut) public note auth {
val = wut;
has = true;
}
function void() public note auth { // unset the value
has = false;
}
}