cpp_generator.h

// Protocol Buffers - Google's data interchange format
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.
//
// Generates C++ code for a given .proto file.

#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_GENERATOR_H__
#define GOOGLE_PROTOBUF_COMPILER_CPP_GENERATOR_H__

#include <string>
#include <google/protobuf/compiler/code_generator.h>

#include <google/protobuf/port_def.inc>

namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {

// CodeGenerator implementation which generates a C++ source file and
// header.  If you create your own protocol compiler binary and you want
// it to support C++ output, you can do so by registering an instance of this
// CodeGenerator with the CommandLineInterface in your main() function.
class PROTOC_EXPORT CppGenerator : public CodeGenerator {
 public:
  CppGenerator();
  ~CppGenerator();

  enum class Runtime {
    kGoogle3,     // Use the internal google3 runtime.
    kOpensource,  // Use the open-source runtime.

    // Use the open-source runtime with google3 #include paths.  We make these
    // absolute to avoid ambiguity, so the runtime will be #included like:
    //   #include "third_party/protobuf/.../google/protobuf/message.h"
    kOpensourceGoogle3
  };

  void set_opensource_runtime(bool opensource) {
    opensource_runtime_ = opensource;
  }

  // If set to a non-empty string, generated code will do:
  //   #include "<BASE>/google/protobuf/message.h"
  // instead of:
  //   #include <google/protobuf/message.h>
  // This has no effect if opensource_runtime = false.
  void set_runtime_include_base(const std::string& base) {
    runtime_include_base_ = base;
  }

  // implements CodeGenerator ----------------------------------------
  bool Generate(const FileDescriptor* file, const std::string& parameter,
                GeneratorContext* generator_context,
                std::string* error) const override;

  uint64 GetSupportedFeatures() const override {
    // We don't fully support this yet, but this is needed to unblock the tests,
    // and we will have full support before the experimental flag is removed.
    return FEATURE_PROTO3_OPTIONAL;
  }

 private:
  bool opensource_runtime_ = true;
  std::string runtime_include_base_;
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CppGenerator);
};

}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google

#include <google/protobuf/port_undef.inc>

#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_GENERATOR_H__