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Manual Reference Pages  -  MATH::EXPR::NODE (3)

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NAME



  Math::Expr::Num - A node in the expretion tree, used as superclass only



CONTENTS

SYNOPSIS



  package Math::Expr::Num;
  require Math::Expr::Node;

  use Math::Expr::Node;
  use vars qw(@ISA);
  @ISA = qw(Math::Expr::Node);



DESCRIPTION



  Each expretion is represented by a tree where each opperation and variable
  is a separate node. This class contain the common code for all those noeds.

  It also defines all the common methods used in those node classes and does
  some typecheckinig for them. Therefor the methodname in the subclasses
  should start with a _-char followed by the actually method name. This
  method will be called by the acutall method in this class after the
  typecheking is done.



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perl v5.20.3 EXPR::NODE (3) 1998-09-01

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