Coding⏱️ 2 min read📅 2026-06-03

How to Fix: What does the error "hdealt::hdealt() is implicitly deleted because default definition would be ill-formed:uninitialized non-static const member" mean

The error indicates that the default constructor for a class is trying to initialize an uninitialized constant member, leading to undefined behavior.

Quick Answer: Use explicit constructors or provide a valid initialization method for the const member.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The error message indicates that the compiler is unable to determine the default constructor for the `hdealt` struct due to an uninitialized non-static const member.

⚠️ Common Causes

  • Boost.MSM version 1.46 or earlier.

✅ Best Solutions to Fix It

Method 1: Updating Boost.MSM Version

  1. Step 1: Update Boost.MSM to version 1.47 or later.

Method 2: Declaring Default Constructor

  1. Step 1: Declare a default constructor for the `hdealt` struct in your code.

💡 Conclusion

By updating Boost.MSM to version 1.47 or later, or by declaring a default constructor for the `hdealt` struct, you should be able to resolve this error.

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