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Diffstat (limited to 'doc/reference.md')
| -rw-r--r-- | doc/reference.md | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/reference.md b/doc/reference.md index 2529c29..ce2f0a7 100644 --- a/doc/reference.md +++ b/doc/reference.md @@ -161,7 +161,7 @@ A declaration is either: > enum_tag (`,` enum_tag)* `,`? > > enum_tag:\ -> enum_range | enum_value +> enum_range | enum_value | enum_other > > enum_range:\ > [IDENTIFIER](#identifier) `=` [INTEGER](#integer) `..` [INTEGER](#integer)) (`{`\ @@ -173,12 +173,20 @@ A declaration is either: > > enum_value:\ > [IDENTIFIER](#identifier) `=` [INTEGER](#integer) +> +> enum_other:\ +> [IDENTIFIER](#identifier) `=` `..` An *enumeration* or for short *enum*, is a declaration of a set of named [integer](#integer) constants or named [integer](#integer) ranges. [integer](#integer) ranges are inclusive in both ends. [integer](#integer) value within a range *must* be unique. [integer](#integer) ranges *must not* overlap. +*enumeration* are closed by default, all values that are not explicitely described in the declaration are treated as invalid and _may_ cause a parsing error. + +An *enumaration* _may_ be declared open by specifiying the default case; all unrecognized values +_shall_ falltrough to the default. + The [integer](#integer) following the name specifies the bit size of the values. ``` @@ -199,6 +207,8 @@ enum CoffeeAddition: 5 { }, Custom = 20..29, + + Other = .. } ``` |