Re: [boost] Road to low-quality-code is paved with good intentions of dropping dependencies

Subject: Re: [boost] Road to low-quality-code is paved with good intentions of dropping dependencies
From: Peter Dimov (lists_at_[hidden])
Date: 2015-01-07 09:54:19

Ion Gaztañaga wrote:

> I would like to depend only on TypeTraits but that's impossible, it brings 
> MPL, Preprocessor, etc.

Regardless of what we ultimately do with TypeTraits, I think that a "core 
type traits" module with minimal dependencies (and no base classes) would be 
of at least interim value to people like Ion (and myself, for that matter) 
who would like to use type traits in f.ex. move and smart_ptr, but without 
the unnecessary dependencies on MPL, Preprocessor, TypeOf and Utility.

In fact, Ion may already have started this work, inside his own module.

The reasonable way forward, in my opinion, is for us to create a new module 
for core type traits, with (say) Ion and John Maddock as maintainers, to 
which then the implementations (and tests) of TypeTraits will gradually 
migrate. TypeTraits will then use the core traits to derive the trait value, 
then add all of the compatibility baggage on top for people who like that 
sort of thing.