GitHub user bensigelman opened a pull request:
https://github.com/apache/thrift/pull/62
make optional fields work in Golang
Hi Jens,
This is a [hopefully] minimal fix for
https://issues.apache.org/jira/browse/THRIFT-2232.
For anyone else who's looking at this, the goal is to decouple the
IsSet...() methods from the *values* of the fields they correspond to.
For example, prior to this change, an optional int with a value of `0` was
considered absent per `IsSetXYZ()`. This is clearly broken, since `0` is often
a valid value for a field.
The approach taken -- per the discussion on jira -- is to use pointers to
fields within the generated Go structs.
A few notes about this approach:
- the existing code already used pointers for struct-valued fields, so now
those are special-cased.
- since one cannot take the address of a temporary in Go, we must create
some temporaries just to get pointers in certain situations.
- we did get to remove a big block of IsSet()-generation code, which is a
nice bonus.
The new code works great for my company's project, though we don't use
every thrift feature available. I generated all of the examples and tried to
`go build` them; all of the example files that generated valid Go code prior to
this change continue to do so after this change, though I don't see a full test
suite to validate beyond that.
Thanks for your time and attention!
Ben
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/resonancelabs/thrift golang_optional_ptrs
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/thrift/pull/62.patch
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commit 6f1e556192244736ee3a326b842aefddc6515483
Author: Ben Sigelman <b...@resonancelabs.com>
Date: 2013-10-30T21:24:24Z
first cut at a fix for https://issues.apache.org/jira/browse/THRIFT-2232
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