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C++26 std::polymorphic supports copyable composite objects

mariusbancila.ro 8 min read Editor score 7/10

The article presents std::polymorphic as a way for owning classes to contain heterogeneous components while remaining regular and copyable. Its examples include event hierarchies, AST nodes, and plugin-configured behavior.

What

C++26’s std::polymorphic helps implement composite classes that own dynamically typed member objects while remaining copyable values.

How

The excerpt contrasts it with unique_ptr, which preserves dynamic type but makes a class move-only unless copying is implemented separately.

Why it matters

For engineers, it offers a way to represent extensible object hierarchies in owning value types without relying on a closed variant or hand-written clone methods.

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