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https://issues.apache.org/jira/browse/AVRO-1635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571131#comment-16571131
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ASF GitHub Bot commented on AVRO-1635:
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wmatthews-google commented on issue #301: AVRO-1635 C++ schema aware encoders
throw tr1::bad_weak_ptr exception for recursive schema
URL: https://github.com/apache/avro/pull/301#issuecomment-410938744
Hi! I wanted to follow up on this. I'd be happy to restructure the code if
that'd help get this in. Please let me know!
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> C++ schema aware encoders throw tr1::bad_weak_ptr exception for recursive
> schema
> --------------------------------------------------------------------------------
>
> Key: AVRO-1635
> URL: https://issues.apache.org/jira/browse/AVRO-1635
> Project: Avro
> Issue Type: Bug
> Components: c++
> Affects Versions: 1.7.7
> Environment: Ubuntu 12.04, gcc 4.6.4
> Reporter: Heye Vöcking
> Priority: Major
> Labels: avro, c++, encode, recursive, schema
>
> Encoding an object with a recursive schema fails when using a jsonEncoder or
> a validatingEncoder. Here is an example:
> Output:
> {noformat}
> terminate called after throwing an instance of
> 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::bad_weak_ptr>
> >'
> what(): tr1::bad_weak_ptr
> {noformat}
> {code:title=container.json|borderStyle=solid}
> {
> "name": "Container",
> "doc": "Container to demonstrate the weak_ptr exception.",
> "type": "record",
> "fields": [{
> "name": "field",
> "type": {
> "name": "Object",
> "type": "record",
> "fields": [{
> "name": "value",
> "type": [
> "string",
> {"type": "map", "values": "Object"}
> ]
> }]
> }
> }]
> }
> {code}
> {code:title=example.cc|borderStyle=solid}
> #include <fstream>
> #include <avro/Compiler.hh>
> #include <avro/Encoder.hh>
> #include <avro/Stream.hh>
> #include <avro/ValidSchema.hh>
> #include "container.hh"
> int
> main()
> {
> std::ifstream ifs("container.json");
> avro::ValidSchema schema;
> avro::compileJsonSchema(ifs, schema);
> std::auto_ptr<avro::OutputStream> out = avro::memoryOutputStream();
> // Either one fails, here we use the jsonEncoder
> // avro::EncoderPtr encoder = avro::jsonEncoder(schema);
> avro::EncoderPtr encoder = avro::validatingEncoder(schema,
> avro::binaryEncoder());
>
> // An encoder that doesn't know the schema works fine
> // avro::EncoderPtr encoder = avro::binaryEncoder();
> encoder->init(*out);
> Container container;
> std::map<std::string, Object > object;
> // Note that it doesn't fail if we don't insert a value into the map
> object["a"].value.set_string("x");
> container.field.value.set_map(object);
> avro::encode(*encoder, container);
> return 0;
> }
> {code}
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