Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

访问者设计模式缺少继承

Open Beginner friendly
  • Is something wrong?
#35 0 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
1/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
cpp
Domain
documentation

Research direction

Open slides/design/game.md around line 1000 and review the visitor-pattern example. Update the example to show MoveMessage and JumpMessage inheriting from Message with accept methods dispatching to the corresponding visitor overloads. Done means the slide accurately demonstrates inheritance and double dispatch in C++.

Written by the indexing model from the issue text.

Description

https://github.com/parallel101/course/blob/8c890ba00bc452af8d66c419a27998297378679e/slides/design/game.md?plain=1#L1000
修改为：

struct MoveMessage :Message{
    glm::vec3 velocityChange;

    void accept(MessageVisitor *visitor) override {
        visitor->visit(this);  // 会调用到 visit(MoveMessage *mm) 这个重载
    }
};

struct JumpMessage :Message{
    double jumpHeight;

    void accept(MessageVisitor *visitor) override {
        visitor->visit(this);  // 会调用到 visit(JumpMessage *mm) 这个重载
    }
};
Dominant language
C++
Stars
4.2k
Forks
555
No merged PRs in 30d

Getting set up

This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from parallel101/course

All issues in parallel101/course

Similar issues

More C++ issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.