no_unique_address

In-Depth Analysis of C++20 Features: Design Motivation and Application Strategies of [[no_unique_address]]

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1. Introduction: The Mystery of Empty Type Space In the object model of the C++ language, an “empty class”—that is, a type that contains no non-static member variables, virtual functions, or base classes—should theoretically have zero size. However, the C++ standard states: Every complete object must have a unique address. This means that even if … Read more