John Carmack on Functional Programming in C++

[Walter Bright via Digitalmars-d]

http://gamasutra.com/view/news/169296/Indepth_Functional_programming_in_C.php

Anything John writes is well worth reading, this article included. He includes 
as shout out to D!

"It seems like there is a sound case for a pure keyword in future C/C++ 
standards. There are close parallels with const – an optional qualifier that 
allows compile time checking of programmer intention and will never hurt, and 
could often help, code generation. The D programming language does offer a pure 
keyword. Note their distinction between weak and strong purity – you need to 
also have const input references and pointers to be strongly pure."

On reddit:

https://www.reddit.com/r/programming/comments/2meuco/john_carmack_on_functional_style_in_c/

https://news.ycombinator.com/item?id=8614253