A collection of attribute declaration functions
Declare predicate accessors for the attributes associated with the
specified symbols
.
# File lib/treequel/mixins.rb, line 352 def predicate_attr( *symbols ) symbols.each do |attrname| define_method( "#{attrname}?" ) do instance_variable_defined?( "@#{attrname}" ) && instance_variable_get( "@#{attrname}" ) ? true : false end define_method( "#{attrname}=" ) do |newval| instance_variable_set( "@#{attrname}", newval ? true : false ) end alias_method "is_#{attrname}?", "#{attrname}?" end end