[boost] [program_options] validation_error in 1.42

Subject: [boost] [program_options] validation_error in 1.42
From: Alexander Fokin (apfokin_at_[hidden])
Date: 2010-03-09 10:23:35

It seems the way program_options deals with validation errors was
changed in 1.42.

Constructor of validation_error now takes kind_t and option name and
value. Before 1.42 it was possible to specify what exactly was wrong
with the option value in the constructor of validation_error. Now I
see no options but to subclass validation_error. Was this change
intentional?

Also, documentation need to be fixed to reflect these changes. More
precisely, the following line in "Custom Validators" section will lead
to compilation error:
> throw validation_error("invalid value");

-- 
Best regards,
  Alexander Fokin, ru.elric_at_gmail.com.