May 2017
Intermediate to advanced
590 pages
17h 18m
English
Content preview from Modern C++ Programming Cookbook
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Using std::any to store any value
C++ does not have a hierarchical type system like other languages (such as C# or Java) and, therefore, it does not have a possibility to store multiple types of value in a single variable like it is possible with type Object in .NET and Java or natively in JavaScript. Developers have long time used void* for that purpose, but this only helps store pointers to anything and is not type-safe. Depending on the end goal, alternatives can include templates or overloaded functions. However, C++17 has introduced a standard type-safe container, called std::any, that can hold a single value of any type.
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