[Boost-users] [multiindex] key extractor as free function - how?

From: Markus Werle (numerical.simulation_at_[hidden])
Date: 2007-01-22 05:44:53

Hi!

I read from the docs that we can define key extractors to be one of 
- identity
- member
- mem_fun
- composite_key

Is it possible to use a free function as key extractor in the same way
as the ones listed above and can you give an example of this?

reagrds, Markus