Andrei Alexandrescu

Andrei Alexandrescu
Alexandrescu at ACCU 2009
Born	1969 (age 45–46) Bucharest,[1] Romania
Nationality	Romanian, American [2]
Education	Politehnica University of Bucharest and University of Washington
Occupation	Research scientist at Facebook
Known for	Expert on C++ and D programming[3]
Spouse(s)	Sanda Alexandrescu
Website
erdani.org

Andrei Alexandrescu is a Romanian American C++ and D language^[3] programmer and author. He is particularly known for his pioneering work on policy-based design implemented via template metaprogramming. These ideas are articulated in his book Modern C++ Design and were first implemented in his programming library, Loki. He also implemented the "move constructors" concept in his MOJO library.^[4] He contributed to the C/C++ Users Journal under the byline "Generic<Programming>". Alexandrescu is currently a research scientist at Facebook.

He became an American citizen in August 2014.^[5]

He is a developer of the D programming language.

Education and career

Alexandrescu received a B.S. degree in Electrical Engineering from Polytechnic University of Bucharest (Universitatea Politehnica din Bucureşti) in July 1994.^[6][7]

His first article was published in the C/C++ Users Journal in September 1998. He was a program manager for Netzip, Inc. from April 1999 until February 2000. When the company was acquired by RealNetworks, Inc., he served there as a development manager from February 2000 through September 2001.^[6]

Alexandrescu earned an M.S. (2003) and a Ph.D. (2009) in computer science from the University of Washington.^[8][9][10]

More recently, he has been assisting Walter Bright in the development of the D programming language. Alexandrescu released a book titled The D Programming Language in May 2010.

Alexandrescu, Herb Sutter, and Scott Meyers run C++ and Beyond, a small annual technical conference.

Bibliography

• Andrei Alexandrescu (February 2001). Modern C++ Design: Generic Programming and Design Patterns Applied. Addison-Wesley. ISBN 978-0-201-70431-0. 
• Herb Sutter, Andrei Alexandrescu (November 2004). C++ Coding Standards: 101 Rules, Guidelines, and Best Practices. Addison-Wesley. ISBN 978-0-321-11358-0. 
• Andrei Alexandrescu (June 2010). The D Programming Language. Addison-Wesley. ISBN 978-0-321-63536-5. 

Contributions

Expected is a template class for C++ which has been proposed for inclusion in Boost.^[11] Alexandrescu proposes ^[12] Expected<T> as a class for use as a return value which contains either a T or the exception preventing its creation, which is an improvement over use of either return codes or exceptions exclusively. Expected can be thought of as a restriction of sum (union) types or algebraic datatypes in various languages, e.g., Hope, or the more recent Haskell and Gallina; or of the error handling mechanism of Google's Go.

He explains the benefits of Expected<T> as:

• Associates errors with computational goals
• Naturally allows multiple exceptions in flight
• Switch between error handling and exception throwing styles
• Teleportation possible across thread boundaries, across nothrow subsystem boundaries and across time (save now, throw later)
• Collect, group, combine exceptions

Example

For example, instead of any of the following common function prototypes:

int parseInt(const string&); // Returns 0 on error and sets errno.

or

int parseInt(const string&); // Throws invalid_input or overflow

he proposes the following:

Expected<int> parseInt(const string&); // Returns an expected int: either an int or an exception

References

External links

• Alexandrescu's homepage - Contains links to downloadable Loki libraries for various compilers.
• (Romanian) Interviu MONEY.ro: Facebook face angajări în România, 1 March 2010