What are good introductions to the creation of C++ expression template systems? I would like to express arithmetic on user defined types while avoiding temporary values (which may be large), and to learn how to do this directly rather than applying an existing library.
I have found Todd Veldhuizen's original paper and an example from the Josuttis C++ Templates book, and an article by Kreft & Langer. It is mentioned in Lecture 6 of a course on Modern C++, referring back to Josuttis.The POOMA library background introduces expression templates nicely.
I am looking for simple, clear expositions.
You should get a copy of C++ Templates: The Complete Guide.
The code example to which you link doesn't have the accompanying text, which is quite helpful (the chapter on expression templates is 22 pages long). Without the text, all you have is code without any comments or explanation as to what it does and how and why it does it.