Tiny Metaprogramming Library -- Eric Niebler
We like to link to articles at all levels. This one's near the top of the scale, for those looking for a real challenge:
Tiny Metaprogramming Library
by Eric Niebler
As the intro says [emphasis ours]:
(Difficult-to-grok metaprogramming below. Not for the faint of heart.)
From the rest of the introduction:
At the recent Urbana-Champaign meeting of the C++ Standardization Committee, Bill Seymour presented his paper N4115: Searching for Types in Parameter Packs which, as its name suggests, describes a library facility for, uh, searching for a type in a parameter pack, among other things. It suggests a template called
packerto hold a parameter pack:// A class template that just holds a parameter pack: template <class... T> struct packer { };Many of you are probably already familiar with such a facility, but under a different name:
// A class template that is just a list of types: template <class... T> struct typelist { };It became clear in the discussion about N4115 that C++ needs a standard
typelisttemplate and some utilities for manipulating them. But what utilities, exactly? ...
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