[boost] Type Traits, Take Two

From: jsiek_at_[hidden]
Date: 2000-01-05 17:48:24

scleary_at_[hidden] writes:
 > 
 > Then I divided these numeric types into three sources:
 >   standard - those types specifically required by the Standard
 >   extension - those types provided as a compiler extension
 >   user-supplied - those types that specialize std::numeric_limits
 > And created the following categories:
 >   standard - any numeric type of standard source
 >   extension - any numeric type of extension source (NOT standard)
 >   builtin (= standard + extension)
 >   {no name} - the default includes all sources

Just curious, what's the purpose of this set of categories?