Andrei Alexandrescu

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Andrei Alexandrescu
Alexandrescu at ACCU 2009
Born 1969 (age 49–50)
Bucharest,[1] Romania
Nationality Romanian, American [2]
Education Politehnica University of Bucharest and University of Washington
Occupation Developer of the D programming language
Known for Expert on C++ and D programming[3]
Spouse(s) Sanda Alexandrescu

Andrei Alexandrescu (born 1969) 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 worked as a research scientist at Facebook, before departing the company in August 2015 in order to focus on developing the D programming language.[5]

He became an American citizen in August 2014.[6]

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.[7][8]

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.[7]

Alexandrescu earned an M.S. (2003) and a Ph.D. (2009) in computer science from the University of Washington.[9][10][11]

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.


  • Andrei Alexandrescu (February 2001). Modern C++ Design: Generic Programming and Design Patterns Applied. Addison-Wesley. ISBN 978-0-201-70431-0.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Herb Sutter, Andrei Alexandrescu (November 2004). C++ Coding Standards: 101 Rules, Guidelines, and Best Practices. Addison-Wesley. ISBN 978-0-321-11358-0.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Andrei Alexandrescu (June 2010). The D Programming Language. Addison-Wesley. ISBN 978-0-321-63536-5.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>


Expected is a template class for C++ which has been proposed for inclusion in Boost.[12] Alexandrescu proposes [13] 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


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

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


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


  3. 3.0 3.1 Metz, Cade (7 July 2014). "The Next Big Programming Language You've Never Heard Of". Wired. Retrieved 27 July 2014. Today, Alexandrescu is a research scientist at Facebook, where he and a team of coders are using D to refashion small parts of the company’s massive operation.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Alexandrescu, Andrei (1 February 2003). "Move Constructors". Dr. Dobbs Journal. Archived from the original on 7 May 2009. Retrieved 25 March 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. "Moving forward with work on the D language and foundation". 25 August 2015. Retrieved 28 August 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. "Sixteen years ago, at 28, I landed in New York with $300 to my name. Today I became a US citizen. It's been a wild ride that I hope will go on!"
  7. 7.0 7.1 Andrei Alexandrescu: Resumé
  8. ACCU Spring Conference 2001
  9. ACCU 2008: Speakers
  10. ACCU 2010: Speakers
  11. Computer Science & Engineering, Recent Ph.D. Graduates (Summer 2009). University of Washington.
  12. Botet; Talbot. "A proposal to add a utility class to represent expected monad" (PDF).<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  13. Alexandrescu. "Systematic Error Handling in C++".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

External links