Example code illustrating Expression Templates

[pranavladkat]

Hello,

I'm trying to explore expression templates. After reading from quite few sources, I'm getting the basic idea of using ET and benefits they provide such as avoiding temporaries...

Though I came across many examples but they all were individual modules and not an entire code. Can anybody provide (or point me to) a simple code (a complete compilable code) of a simple example like vector addition so that I can get a whole picture of it and play around with it before I start writing my own code (which is resulting in long list of errors currently)

Though I agree ETs are used in libraries such as Blaze, Blitz++ etc but those codes are not for beginners, so it'd be great if someone can help.

Thanks,
Pranav

[JLBorges]

Here is an example of lazy evaluation for vector addition:
http://web.archive.org/web/20120906070131/http://cpp-next.com/archive/2011/01/expressive-c-expression-optimization/

If you are unfamiliar with boost Proto, start reading from the first article of the series:
http://web.archive.org/web/20120628021148/http://cpp-next.com/archive/2010/08/expressive-c-introduction/

Boost Proto: http://www.boost.org/doc/libs/1_57_0/doc/html/proto.html

[pranavladkat]

Thank you JLBorges for the links. They're very helpful.