As Adam Nevraumont pointed out, std::unique_ptr<void*> wont work.

If you're using c++17, std::any is probably your best option.

This would replace std::unique<void> with std::unique<std::any>>. Keep in mind std::unique_ptr<void> won't compile without a lot of extra work.

Best options are:

1. Use a raw pointer void*
2. Use std::unique<std::any>> for smart pointer support + type safety

Resources on std::any

• https://cengizhanvarli.medium.com/what-is-std-any-in-c-76f2575ad37b
• https://en.cppreference.com/w/cpp/utility/any

Questions related to std::any:

• When should I use std::any