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Contents
# frozen_string_literal: true
##
# An LP Variable. Used as arguments in LP Expressions.
# The subtypes BV and IV represent Binary and Integer variables.
# These are constructed dynamically by using the special Capitalised variable declaration syntax.
##
class LV
attr_reader :name, :args
attr_writer :value
attr_accessor :lt, :lte, :gt, :gte
include Rulp::Bounds
include Rulp::Initializers
def to_proc
->(index){ send(self.meth, index) }
end
def meth
"#{self.name}_#{self.suffix}"
end
def suffix
"f"
end
def self.definition(name, *args)
identifier = "#{name}#{args.join("_")}"
defined = LV::names_table["#{identifier}"]
case defined
when self then defined
when nil then self.new(name, args)
else raise StandardError.new("ERROR:\n#{name} was already defined as a variable of type #{defined.class}."+
"You are trying to redefine it as a variable of type #{self}")
end
end
def * (numeric)
self.nocoerce
Expressions.new([Fragment.new(self, numeric)])
end
def -@
return self * -1
end
def -(other)
self + (-other)
end
def + (expressions)
Expressions[self] + Expressions[expressions]
end
def value
return nil unless @value
case self
when BV then @value.round(2) == 1
when IV then @value
else @value
end
end
def value?
value ? value : false
end
def inspect
"#{name}#{args.join("-")}(#{suffix})[#{value.nil? ? 'undefined' : value }]"
end
alias_method :selected?, :value?
end
class BV < LV;
def suffix
"b"
end
end
class IV < LV;
def suffix
"i"
end
end
Version data entries
13 entries across 13 versions & 1 rubygems