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New generator options for oneofs: allow skipping or generating as normal 'optional' fields.

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The behaviour with no_unions:true is the same as of nanopb 0.3.1 and earlier.
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Petteri Aimonen
2015-01-11 19:38:05 +02:00
parent 8ef0392231
commit 8d12fecc7e
3 changed files with 42 additions and 10 deletions
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docs/migration.rst
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@@ -11,6 +11,25 @@ are included, in order to make it easier to find this document.
.. contents ::
Nanopb-0.3.2 (2015-01-xx)
=========================
Add support for OneOfs
----------------------
**Rationale:** Previously nanopb did not support the *oneof* construct in
*.proto* files. Those fields were generated as regular *optional* fields.
**Changes:** OneOfs are now generated as C unions. Callback fields are not
supported inside oneof and generator gives an error.
**Required actions:** The generator option *no_unions* can be used to restore old
behaviour and to allow callbacks to be used. To use unions, one change is
needed: use *which_xxxx* field to detect which field is present, instead
of *has_xxxx*. Compare the value against *MyStruct_myfield_tag*.
**Error indications:** Generator error: "Callback fields inside of oneof are
not supported". Compiler error: "Message" has no member named "has_xxxx".
Nanopb-0.3.0 (2014-08-26)
=========================