C++26: std::indirect

This article discusses the proposed std::indirect feature in C++26, exploring its implications and usage. It provides insights into how this feature can enhance the language's capabilities.

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C++26 adds two new vocabulary types in <memory> , introduced by P3019R14 (Coe, Peacock, Parent). From the abstract:

The class template indirect confers value-like semantics on a dynamically-allocated object. An indirect may hold an object of a class T . Copying the indirect will copy the object T . When an indirect<T> is accessed through a const access path, constness will propagate to the owned object.

The class template polymorphic confers value-like semantics on a dynamically-allocated object. A polymorphic<T> may hold an object of a class publicly derived from T . Copying the polymorphic<T> will copy the object of the derived type. When a polymorphic<T> is accessed through a const access path, constness will propagate to the owned object.

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