Math::Expr::OpperationDB - A db of basic opperands properties
This is a database containing info about the different opperations
(eg +, -, *, ...). Each opperation is represented by a regexp
mathing a type specifikation. That way Real*Real wont be the same
opperation as Matrix*Matrix even though the same operation character
The data stored for each operation is the return type of the
operation and whatever this operation is kommutativ or assosiative.
Currently the data is hardcoded into the code, but that is about to
Creates a new db.
Tries all the type regexps in the db on $t and if one matches that
post is returned.