| Andrei Alexandrescu | |
| Birth Place: | 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: | Sanda Alexandrescu |
Tudor Andrei Cristian Alexandrescu[4] (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.[5] He contributed to the C/C++ Users Journal under the byline "Generic<Programming>".
He became an American citizen in August 2014.[6]
Alexandrescu received a B.S. degree in Electrical Engineering from Polytechnic University of Bucharest (Universitatea Politehnica din București) 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.
Alexandrescu earned a M.S. (2003) and a PhD (2009) in computer science from the University of Washington.[9] [10] [11]
In 2006 Alexandrescu began assisting Walter Bright on the development of the D programming language.[12] He released a book titled The D Programming Language in May 2010.
From 2010 to 2014, Alexandrescu, Herb Sutter, and Scott Meyers ran a small annual technical conference called C++ and Beyond.
Alexandrescu worked as a research scientist at Facebook for over 5 years, before departing the company in August 2015 in order to focus on developing the D programming language.[13]
In January 2022, Alexandrescu began working at Nvidia as a Principal Research Scientist.[14]
Expected is a template class for C++ which is on the C++ Standards track.[15] [16] Alexandrescu proposes[17] 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, or the Result type in Rust.
He explains the benefits of Expected<T> as:
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
From 2000[18] onwards, Alexandrescu has advocated and popularized the scope guard idiom. He has introduced it as a language construct in D.[19] It has been implemented by others in many other languages.[20] [21]
Generic Programming and Design Patterns Applied
. Andrei Alexandrescu. Addison-Wesley. 978-0-201-70431-0. February 2001.