Method factory

src/test/compressor/compressor_plugin_example.cc:32–41

  {}

  int factory(CompressorRef *cs,
		      ostream *ss) override
  {
    if (compressor == 0) {
      CompressorExample *interface = new CompressorExample();
      compressor = CompressorRef(interface);
    }
    *cs = compressor;
    return 0;
  }
};

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