What are the coolest examples of metaprogramming that you've seen in C++?
c++, metaprogramming, template-meta-programming, templates
Solution
Personally, I think Boost.Spirit is a pretty amazing example of meta-programming. It's a complete parser generator that lets you express grammars using C++ syntax.
Problem
What are the coolest examples of metaprogramming that you've seen in C++? What are some practical uses of metaprogramming that you've seen in C++?