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Document BETTER_ENUMS_CLASS_ATTRIBUTE

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Follow-on to #80.

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Anton Bachin 2020-10-19 08:33:38 +03:00
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doc/OptInFeatures.md
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@ -88,3 +88,15 @@ Here they are:
%% description = Optional Better Enums features, disabled by default for
performance or compatibility reasons.
### Injecting tokens
You can define `BETTER_ENUMS_CLASS_ATTRIBUTE` before declaring a Better Enum, to
inject tokens into the class declaration. For example, in
#define <em>BETTER_ENUMS_CLASS_ATTRIBUTE</em> <em>__attribute__(foo)</em>
<em>BETTER_ENUM</em>(<em>Channel</em>, int, Red, Green, Blue)
The resulting enum declaration will begin with
class <em>__attribute__(foo)</em> <em>Channel</em> {