A doubly-linked list that enforces sorting and provides convenience functions for determining insert points.
The only environmental dependency you need is Node. Presently we can guarantee this all works with Node 8.
npm install
npm run compile
Run the tests with npm run test.
The repo is composed as a Truffle project, and is largely idiomatic to Truffle's conventions. The tests are in the test directory, the contracts are in the contracts directory and the migrations (deployment scripts) are in the migrations directory.
The sorted DLL is a composition of the EPM dll and attrstore libraries created by Yorke Rhodes and Cem Ozer.
The most important properties for EVM data structures are constant-time inserts and deletes. Lookups can be less efficient, since those can be done as simulated calls off-chain. A DLL is a nice data structure for the EVM since is permits constant time inserts and deletes. The tradeoff is that the insertion point has to be provided with the insert call, but a convenience function getInsertPoint is provided to this end.
Every node in the SDLL has an AttributeStore with which string-keyed data can be stored. All stored data must be uints (for now).
An SDLL has a sortAttr (sort attribute) with which the list is ordered. This attribute should be set at list instantiation and then protected.
The SDLL is a library, so can be imported and used with Solidity's object-like syntax (using SDLL for SDLL.Data).
To see examples of usage, the test suite is instructive.