Coding⏱️ 2 min read📅 2026-05-29

How to Fix: Why do I get link errors regarding vtables of my type erased objects?

Type erased class implementation issue.

Quick Answer: Use a pointer or reference to the ErasedType instead of storing it directly, and use dynamic_cast to access its members.

📋 Table of Contents

  1. ✅ Best Solutions to Fix It
  2. 💡 Conclusion

To resolve the issue of link errors regarding vtables of your type erased objects, you need to provide a definition for the virtual function in the base class or use a technique like SFINAE (Substitution Failure Is Not An Error) to disable the compilation when the derived class is not present.

✅ Best Solutions to Fix It

Method 1: Provide a Definition for the Virtual Function

  1. Step 1: Move the definition of the virtual function from the derived class to the base class.

Method 2: Use SFINAE

  1. Step 1: Add a trait to the base class that enables the virtual function only when the derived class is present.

💡 Conclusion

By applying one of these methods, you can resolve the link errors related to vtables of your type erased objects and ensure a stable compilation process.

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