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lib/Config/General/Hierarchical.pm  view on Meta::CPAN

If a B<value> contains the following syntax

 ${variable_name}

this token is substituted with the B<value> of C<variable_name>. The I<inline variable
substitution> is made at get time, so the B<value> substituted is the final one of the
variable. The B<value> of C<variable_name> is obtained by a C<get()> call, so the B<syntax
constraiant> check is performed on it before the substitution.

To do the I<inline variable substituition> is necessary that a reference to the B<root
node> is still alive, otherwise a C<die()> is called. Anyway, it is possible to call the
C<check()> method on the B<node> before loosing the B<root node> reference in order to
cache all the values. It can be called explicitally on a B<node> of implicitally by
the C<new()> methed using the C<check> parameter with a true value.

 # config.conf file
 <node>
  key ${var}
 </node>
 var value