Class: Axiom::Relation::Empty

Inherits:

Object
Axiom::Relation
Materialized
Axiom::Relation::Empty

Defined in:: lib/axiom/relation/empty.rb

Overview

An empty relation

Constant Summary

Constants inherited from Materialized

Materialized::ZERO_TUPLE

Instance Attribute Summary

Attributes inherited from Materialized

Attributes inherited from Axiom::Relation

Instance Method Summary collapse

#initialize(header) ⇒ undefined constructor

Initialize an empty Relation.

Methods inherited from Materialized

#materialize, #materialized?, new, #size

Methods inherited from Axiom::Relation

#==, #[], #directions, #each, #empty?, #include?, #materialize, #materialized?, new, #replace

Methods included from Visitable

Constructor Details

#initialize(header) ⇒ `undefined`

Initialize an empty Relation

Parameters:

header (Header) —

the header for the empty relation



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# File 'lib/axiom/relation/empty.rb', line 17

def initialize(header)
  super(header, ZERO_TUPLE)
end