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Packing to a file

Instead of packing to a buffer, and subsequently storing data to a file, you can directly pack to a file by passing the filename and openmode arguments to pack or xdr_pack's constructor. The arguments are identical to that of fopen:

  pack_t checkpoint("foo.ckpt","w");
  checkpoint << bar;
The advantage here is large checkpoints can be written to disk without intermediate buffering in memory. The file is closed when the pack_t object is destroyed.

Russell Standish 2016-09-02