Substate

Substate is a crash consistent undo framework for editor applications.

Introduction

Undo/Redo command is an inevitable feature of an editing application.

Application developers tend to implement this functionality using the Command design pattern, typically creating a basic command class and then deriving a subclass for each type of user operation, and implementing undo and redo virtual functions for those subclasses.

Such workflow is not only time-consuming, but also tightly tied to the specific application features, which is too inflexiable to handle the ever-changing developing requirements.

We propose a flexible and efficient undo framework which not only allows developers to implement undo/redo features in less time, but also strictly ensures the crash consistency of the application by applying WAL strategy.

Highlights

Universality
Crash Consistency
Delayed Deletion

Requirements

Component	Requirement	Detailed
Compiler	>=C++17	/
CMake	>=3.19	>=3.20 is recommended

Dependencies

qmsetup

Build & Install

cmake -B build -G Ninja
cmake --build build --target all
cmake --build build --target install

License

Substate Library is licenced under the Apache 2.0 License.