Difference between revisions of "Const"
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The code in the above example will produce an error. Whilst the first assignment (''a:=34'') is legal, on the subsequent line the programmer has modified the type of ''a'' to be that of ''a'' combined with the type ''const''. The second assignment is attempting the modify a now read only variable and will fail. | The code in the above example will produce an error. Whilst the first assignment (''a:=34'') is legal, on the subsequent line the programmer has modified the type of ''a'' to be that of ''a'' combined with the type ''const''. The second assignment is attempting the modify a now read only variable and will fail. | ||
| + | |||
| + | ''Since: Version 0.41b'' | ||
[[Category:Type Library]] | [[Category:Type Library]] | ||
[[Category:Compound Types]] | [[Category:Compound Types]] | ||
[[Category:Attribute Types]] | [[Category:Attribute Types]] | ||
Revision as of 18:18, 13 January 2013
Syntax
const[ ]
Semantics
Enforces the read only property of a variable.
Example
var a:Int; a:=34; a:(a :: const[]); a:=33;
The code in the above example will produce an error. Whilst the first assignment (a:=34) is legal, on the subsequent line the programmer has modified the type of a to be that of a combined with the type const. The second assignment is attempting the modify a now read only variable and will fail.
Since: Version 0.41b
