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not just a single field

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Alex Burka 2016-06-13 17:54:39 -04:00 committed by Alex Burka
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src/doc/book/ffi.md
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@ -580,7 +580,7 @@ However, the language provides a workaround.
As a special case, an `enum` is eligible for the "nullable pointer optimization" if it
contains exactly two variants, one of which contains no data and the other contains
a single field of one of the non-nullable types listed above (or a struct containing such a type).
a field of one of the non-nullable types listed above (or a struct containing such a type).
This means it is represented as a single pointer, and the non-data variant is represented as a
null pointer. This is called an "optimization", but unlike other optimizations it is guaranteed
to apply to eligible types.