Re: Free feature problem

From: David Abrahams (dave_at_[hidden])
Date: 2004-07-02 08:12:56

Vladimir Prus <ghost_at_[hidden]> writes:

> pal.tw wrote:
>
>> > which would be used like:
>> >
>> > use-property <os>NT ;
>> >
>> > and will make NT a valid value of the <os> feature. If <os>NT is
>
>> Sorry, forgot to mention one thing...
>> How about introducing a new feature attribute, and declare those
>> features with the new attribute?
>> The new attribute might be a little like the 'free' attribute since
>> we can add one and more values, but also could be put in conditonal
>> requirements. That's what my subject means...;>
>
> This might work for <os>, but not the <toolset> -- since we really have to 
> have only a single value from a predefined set for it. The "use-property" 
> rule will have no problems with it.

An attribute still sounds like a good idea. You don't have to make
it allowable to have multiple unknown values outside of conditions.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com