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I have an auto generated avro schema which I can encode and decode to avro memory streams.

Now, I would like to write to a file, and I have to some how activate my file writer with the following:

#include "avro/Encoder.hh"
#include "avro/Decoder.hh"
#include "avro/ValidSchema.hh"
#include "avro/Compiler.hh"
#include "avro/DataFile.hh

avro::ValidSchema loadSchema(const char* filename)

 std::ifstream ifs(filename);
 avro::ValidSchema result;
 avro::compileJsonSchema(ifs, result);
 return result;


int
main()

 avro::ValidSchema cpxSchema = loadSchema("cpx.json");

 
 avro::DataFileWriter<c::cpx> dfw("test.bin", cpxSchema);
 c::cpx c1;
 for (int i = 0; i < 100; i++) 
 c1.re = i * 100;
 c1.im = i + 100;
 dfw.write(c1);
 
 dfw.close();
 

 
 avro::DataFileReader<c::cpx> dfr("test.bin", cpxSchema);
 c::cpx c2;
 while (dfr.read(c2)) 
 std::cout << '(' << c2.re << ", " << c2.im << ')' << std::endl;
 
 
 return 0;

So, I have my auto-generated file in auto_generated.hh (command: avrogencpp -i schema.json -o auto_generated.hh -n auto_generated) and I have included all relevant files therein, and short of loading the schema from my json file (which seems to be beside the point if I have already auto-generated everything), I have tried the following:

#include "auto_generated.hh"

int main()

 /* 
 auto_generated::schema() is going to produce the datum which I am
 storing. 

 auto_generated::schema is the struct which contains the data
 members which will be set during the course of data output.

 */ 


 //avro::ValidSchema vs; vs.setSchema(auto_generated::schema);

 // auto_generated::schema schema = auto_generated::schema();
 // avro::ValidSchema vs(schema);

 // avro::ValidSchema vs;
 // auto_generated::schema schema = auto_generated::schema();
 // vs.setSchema(schema);

 avro::ValidSchema vs;
 avro::Schema s = auto_generated::schema(); // or without ()
 vs.setSchema(s);

 // etc.

 avro::DataFileWriter<auto_generated::schema> dfw("foo",vs);

How do I initialize the ValidSchema and construct the DataFileWriter so as to write my data to a file?