Class Value
java.lang.Object
Expr
Value
- Direct Known Subclasses:
- Num
public abstract class Value
- extends Expr
Abstract class Value -
The type of all Expressions which self-evaluate:
Numbers, and (later, in Q3) functions.
See http://www.radford.edu/itec380/2009fall-ibarland/Hw06/hw06.html
(This architecture works as long as every value is a type of
Expression, which is a nice feature to have in a language;
it means that any result can be pasted/substituted into
larger expressions, which promotes a substitution model
of evaluation.)
- Version:
- 2014.Nov.04
- Author:
- Ian Barland
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Constructor Summary |
Value()
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Value
public Value()
eval
public Value eval()
- Description copied from class:
Expr
- Evaluate a given Expr.
- Specified by:
eval in class Expr
- Returns:
- the Value this Expr evaluates to.
(In O0, all values are numbers (doubles), but
in O3 that will change, which is why we have
pre-emptively made the return type 'Value'.)
hashCode
public int hashCode()
- Overrides:
hashCode in class Expr