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Tuesday, May 8 • 2:30pm - 4:00pm
Futures Without Type Erasure

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The most popular implementations of futures, including `std::future`, use dynamic allocation and type erasure in order to allow composition of futures into fork/join asynchronous computation graphs. While this overhead is unavoidable when the control flow of the asynchronous graph depends on run-time conditions, it is unnecessary when the "shape" of the computation graph is known at compile-time.

* Is it possible to implement composable futures without dynamic allocation and type erasure?
* Is it worth it?

After a brief overview of the upcoming `std::experimental::future` additions focused on composability, this talk answers these questions showing the train of thought behind the design and implementation of an experimental future library, step-by-step. The library will revolve around the following idea: embed the asynchronous computation graph into types. Template metaprogramming and compile-time transformations will be heavily used to implement zero allocation & zero type erasure futures.
Running time, compilation time, and generated assembly benchmarks/comparisons will be provided and analyzed.

The code covered in the talk will make use of C++17 language and library features, that will be explained throughout the presentation. The intended audience for the talk should be familiar with most C++11/14 language features and with `std::future` (or `boost::future`). Knowledge of C++17 features is recommended but not required.

Speakers
avatar for Vittorio Romeo

Vittorio Romeo

Software Engineer, Bloomberg
Vittorio Romeo (B.Sc. Computer Science) has been a Software Engineer at Bloomberg for more than 3 years, working on mission-critical company C++ infrastructure and providing Modern C++ training to hundreds of fellow employees.He began programming around the age of 8 and quickly became... Read More →


Tuesday May 8, 2018 2:30pm - 4:00pm
Flug Auditorium

Attendees (47)