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Wednesday, September 16 • 14:10 - 14:40
The Many Shades of reference_wrapper

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You may have heard of std::reference_wrapper's role in make_tuple, but this is not today's topic. The role that reference_wrapper plays is larger than unwrapping references in C++ standard library API. It is the language's response to the need for references with rebinding semantics, which may explain why such a small utility is still receiving love and polishes in C++20.
To put it in the other way, every reference in Python is rebindable -- with garbage collection, of course. But the semantics in common implies that reference_wrapper may be very useful. This talk will go through these use cases, see how reference_wrapper's design carefully enables them through details. The talk will also compare reference_wrapper with other facilities in the language and the standard library to give you hints about how to choose from the reference-like types.

Speakers
avatar for Zhihao Yuan

Zhihao Yuan

HPC Engineer, SimpleRose Inc
Zhihao Yuan is an HPC Engineer at SimpleRose Inc. He participated in standardizing designated initializers and improved narrowing conversions in C++20. After giving a talk on CppCon to advocate NOT to program any macros, he dived into a project where the number of identifiers that... Read More →


Wednesday September 16, 2020 14:10 - 14:40 MDT
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