anchor.diff:      
   == type traits/policy traits
   
  -[source]
  +[source,c++]
   ----
   template<> 
   struct algorithm_selector< true > { 
  
positive.code: 
  == volatile
  
  [source]
  ----
  static int foo;
  
  
negative.code: = C++ questions
  :toc: macro
  
  toc::[]
  
  