/ 
Math-Expr-0.2
River stage zero No dependents
/ Math::Expr::Var

NAME

Math::Expr::Var - Represents one variable in a parsed expression tree

SYNOPSIS

require Math::Expr::Opp;
require Math::Expr::Var;
require Math::Expr::Num;

# To represent the expression "x+7":
$n=new Math::Expr::Opp("+");
$n->SetOpp(0,new Math::Expr::Var("x"));
$n->SetOpp(1,new Math::Expr::Num(7));
print $n->tostr . "\n";

DESCRIPTION

Used by the Math::Expr to represent variables.

METHODS

$n=new Math::Expr::Var($name)

Creates a new representation of the variable named $name.

$n->tostr

Returns the string representation of the variable, that is the 
variable name.

$n->strtype

Returns the type of the variable.

$n->BaseType

Simply cals strtype, its needed to be compatible with the other 
elements in the structure.

$n->Simplify

Needed to be compatible with the other elements in the structure. 
Currently this does nothing, but we might have variable types in the 
future that might need simplifications...

$n->Breakable

Needed to be compatible with the other elements in the structure.

$n->Match

Mathces a rule expression with the variable, and returns an array of 
VarSet objects with this variable name set to the expression if there 
types match.

$n->SubMatch

Used by upper level Match procedure to match an entire expression.

$n->Subst($vars)

Returns this variables vaule taken from $vars or a new copy of itselfe 
if it does not excist.

$n->Copy

Returns a new copy of itself.

AUTHOR

Hakan Ardo <hakan@debian.org>

SEE ALSO

L<Math::Expr::Opp>