Signature Description
enum class io_format : unsigned char {
 csv = 1,
 json = 2,
 hdf5 = 3, // Not Implemented
 binary = 4, // Not Implemented
};
This specifies the I/O format for reading and writing to/from files, streams, etc.
Currently only CSV format is supported. The CSV format is as follows:
  • Any empty line or any line started with # will be ignored
  • A data line has the following format:
    <column name>:<number of data points>:<\<type\>>:data,data,…
    An example line would look like this:
    price:1001:<double>:23.456,24.56,…