Modern C++ Programming Cookbook by Bancila Marius


Modern C++ Programming Cookbook by Bancila Marius

Author:Bancila, Marius [Bancila, Marius]
Language: eng
Format: azw3, epub
Tags: COM051390 - COMPUTERS / Programming / Open Source, COM051010 - COMPUTERS / Programming Languages / General, COM051070 - COMPUTERS / Programming Languages / C++
Publisher: Packt Publishing
Published: 2017-05-14T16:00:00+00:00


See also

Using std::any to store any value

Using std::variant as a type-safe union

Using std::variant as a type-safe union

In C++, union is a special class type that, at any point, holds a value of one of its data members. Unlike regular classes, unions cannot have base classes nor can they be derived, and they cannot contain virtual functions (that would not make sense anyway). Unions are mostly used to define different representations of the same data. However, unions only work for types that are POD. If a union contains values of non-POD types, then these members require explicit construction with a placement new and explicit destruction, which is cumbersome and error-prone. In C++17, a type-safe union is available in the form of a standard library class template called std::variant. In this recipe, you will learn how to use it to model alternative values.



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