Questions tagged [visitor-pattern]
The visitor design pattern is a way of separating an algorithm from an object structure on which it operates. A practical result of this separation is the ability to add new operations to existing object structures without modifying those structures.
29 questions
3 votes
1 answer
118 views
Implementing an Object type in C++
I'm currently working through the "Crafting Interpreters" book by Robert Nystrom. He uses Java to implement the visitor pattern in which the visitor functions return the Object type. C++ ...
- 33
4 votes
3 answers
192 views
Visitor Pattern to handle human and AI responses
Let's suppose there is a method of an Inputter class that queries many questions. The Human inputter would have to answer all ...
- 1,401
3 votes
1 answer
661 views
C++: Visit Any Type Holding Other Types (`std::any`, `std::variant`, etc.)
Intro I want to visit the value held by a class, which could be of multiple types. This class is very similar to a std::any, so I will be using this in this ...
- 33
3 votes
1 answer
2k views
visit for std::any
While solving an online excersise I have written some basic implementation for a visit function that works with std::any. The ...
- 558
0 votes
1 answer
217 views
Refactor typescript long switch case that run different code in according to property value
I have a typescript function that executes an array of actions on a given string value. This is the code: ...
- 183
3 votes
2 answers
205 views
Collider class using some kind of visitor pattern
I'm trying to create a Collider class which will process collisions between different classes of the same base. One restriction is that I want these classes know nothing about each other, now they ...
- 145
3 votes
0 answers
164 views
Replacing type-check with Visitor in Immutable Event-Sourced Aggregate
In my previous question, one of the answers mentioned that I shouldn't be changing behavior based on the Event class The whole point of classing is that you can get result without having to decide ...
- 207
6 votes
0 answers
321 views
Create 'classical' visitor from lambdas
I've watched a talk by Fedor Pikus on design patterns held at CppCon 2019. Motivated by this, I wrote my own visitor implementation and some helpers which allow me to create a visitor from a couple of ...
- 203
2 votes
0 answers
113 views
Visitor pattern, Extensible visitor for custom implementation
I'm writing my own expression tree system, just for fun, but I have a few doubts about my code. My goal here is to create an abstract layer of expressions, and allow different "languages" to ...
Eden Yashar
5 votes
1 answer
449 views
Generic Visitor pattern library for polymorphic virtual class hierarchies
Inspired by this cppcon talk from Fedor Pikus about design patterns and some real-world need I implemented a library that allows the user to add a generic visitor pattern capabilities to class ...
- 51
2 votes
0 answers
92 views
Mapping an object tree to another object tree
Programming to an interface is a design principle that enhances the flexibility of software by hiding implementation details. Consider an object tree that only exposes an interface, but you want to ...
- 423
5 votes
1 answer
3k views
Calculating the average of all nodes in a Binary Search Tree using visitors
I'm required to calculate the average value of all nodes in a BST using a Visitor, I'm not sure if I did this correctly or if i could just calculate the average ...
- 51
4 votes
1 answer
772 views
Iterate through Expression Tree
I'm trying to build an iterator (enumerator) that can select specific elements in an Expression tree by traversing the tree and deferring further iteration until ...
- 141
2 votes
3 answers
314 views
BST traverse as higher order function [closed]
Consider the following function to traverse a BST ...
- 483
7 votes
0 answers
732 views
Chaining JSON transformations with visitors
I have currently two use-cases that require JSON transformations before it can be deserialized. The first use-case requires changing the custom short type property name from ...
- 44.7k