protobuf_registry.h File Reference

Header probe that enables Protobuf-backed schema-plugin code when available. More...

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Detailed Description

Header probe that enables Protobuf-backed schema-plugin code when available.

Unlike FlatBuffers, Protobuf already provides a process-wide registry of generated descriptors through google::protobuf::DescriptorPool::generated_pool(), so VLink does not need its own table for Protobuf schemas. This header exists purely to:

• Centralise the protobuf reflection includes used by the schema plugin.
• Probe for protobuf availability and expose a feature macro to the rest of the schema-plugin code.

Registration API surface:

Source	API used	Notes
Generated code	DescriptorPool::generated_pool()	Populated by Protobuf at startup
Schema plugin	VLINK_HAS_SCHEMA_PLUGIN_PROTOBUF (defined below)	Enables protobuf code paths

Example

#include <vlink/extension/protobuf_registry.h>
 
#ifdef VLINK_HAS_SCHEMA_PLUGIN_PROTOBUF
auto* pool = google::protobuf::DescriptorPool::generated_pool();
if (auto* desc = pool->FindMessageTypeByName("demo.proto.PointCloud")) {
  // ... reflectively walk the message ...
  (void)desc;
}
#endif