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lib/App/Glacier/Config.pm  view on Meta::CPAN

a particular configuration setting.  The function is called as

    &{$coderef}($vref, @path)

where $vref is a reference to the setting (use $vref->{-value}, to obtain
the actual value), and @path is its patname.    
    
=item check => I<coderef>

Defines a code which will be called after parsing the statement in order to
verify its value.  The I<coderef> is called as

    $err = &{$coderef}($valref, $prev_value)

where B<$valref> is a reference to its value, and B<$prev_value> is the value
of the previous instance of this setting.  The function must return B<undef>
if the value is OK for that setting.  In that case, it is allowed to modify
the value, referenced by B<$varlref>.  If the value is erroneous, the function
must return a textual error message, which will be printed using B<$cfg->error>.
    
=back