Difference between revisions of "Interval types updated"
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==Introduction== | ==Introduction== | ||
| − | This is a simplification of [[Read-write types]] where we use the syntax proposed in [[Interval types]] with a special meaning of the interval when used in arguments or return type. | + | This is a simplification of [[Read-write types]] where we use the syntax proposed in [[Interval types]] with a special meaning of the interval when it is the type of an actual generic parameter used in arguments or return type. |
== Example == | == Example == | ||
Revision as of 13:37, 7 July 2007
Research: This page describes research about Eiffel, not the actual language specification.
Introduction
This is a simplification of Read-write types where we use the syntax proposed in Interval types with a special meaning of the interval when it is the type of an actual generic parameter used in arguments or return type.
Example
When you have the following:
a: LIST [A .. B] a.extend (x) -- (1) y := a.item -- (2)
The rules, supposing that we have `extend (g: G)' and `item: G', are that:
- (1) is valid if and only if x is any type in the interval B .. NONE.
- (2) is valid if and only if y is any type in the interval ANY .. A.
