NAME

Math::Expr::MatchSet - Represents matches in algebraic expretions

SYNOPSIS

require Math::Expr::MatchSet;
$s=new Math::Expr::MatchSet;
$s->Set($pos,$match);
$s->Get($pos);

DESCRIPTION

Two expretion can be matched in several ways, therefor we need to be 
able to represent a set of matches keyed by the matchposition (the 
subexpretion, where the match where found).

METHODS

$s=new Math::Expr::MatchSet

Create a new MatchSet object.

$s->Set($pos, $match)

Sets the match at $pos to $match.

$s->Add($pos, $match)

Synonyme to Set.

$s->Insert($mset)

Inserts all mathes in the MatchSet £mset intho $s.

$s->SetAll($var, $obj)

Sets the variable $var to $obj in all mathces in this set, and removes 
all matches that already had a diffrent value for the variable $var.

$s->tostr

Generates a string representation of the MatchSet, used for debugging.

$s->Get($pos)

Returns the Match at possition $pos.

$s->Keys

Returns the positions at which there excists a match.