h5data_proxy< std::vector< std::string > > Struct Template Reference

Specialization for vector of strings. More...

Collaboration diagram for h5data_proxy< std::vector< std::string > >:

Public Types
using	data_type = std::vector< std::string >

Public Member Functions
	h5data_proxy (const data_type &a)
bool	read (data_type &ref, hid_t grp, const std::string &aname, hid_t xfer_plist=H5P_DEFAULT)
bool	write (const data_type &ref, hid_t grp, const std::string &aname, hid_t xfer_plist=H5P_DEFAULT) const

Detailed Description

template<>
struct qmcplusplus::h5data_proxy< std::vector< std::string > >

Specialization for vector of strings.

Definition at line 195 of file hdf_stl.h.

Member Typedef Documentation

data_type

using data_type = std::vector<std::string>

Definition at line 197 of file hdf_stl.h.

Constructor & Destructor Documentation

h5data_proxy()

h5data_proxy ( const data_type &  a )

inline

Definition at line 199 of file hdf_stl.h.

{}

Member Function Documentation

read()

bool read ( data_type &  ref, hid_t  grp, const std::string &  aname, hid_t  xfer_plist = H5P_DEFAULT  )

inline

Definition at line 201 of file hdf_stl.h.

  {
    hid_t datatype = H5Tcopy(H5T_C_S1);
    H5Tset_size(datatype, H5T_VARIABLE);
    hid_t dataset = H5Dopen(grp, aname.c_str(), H5P_DEFAULT);
    std::vector<char*> char_list;
    herr_t ret = -1;
    if (dataset > -1)
    {
      hsize_t dim_out;
      hid_t dataspace = H5Dget_space(dataset);
      hid_t status    = H5Sget_simple_extent_dims(dataspace, &dim_out, NULL);

      char_list.resize(dim_out);
      ret = H5Dread(dataset, datatype, H5S_ALL, H5S_ALL, xfer_plist, char_list.data());

      for (int i = 0; i < dim_out; i++)
        ref.push_back(char_list[i]);

      H5Dvlen_reclaim(datatype, dataspace, xfer_plist, char_list.data());

      H5Sclose(dataspace);
      H5Dclose(dataset);
    }
    H5Tclose(datatype);

    return ret >= 0;
  }

write()

bool write ( const data_type &  ref, hid_t  grp, const std::string &  aname, hid_t  xfer_plist = H5P_DEFAULT  ) const

inline

Definition at line 230 of file hdf_stl.h.

  {
    // See the section in the HDF user's manual on datatypes,
    // particularly the subsection on strings.
    // (e.g. http://davis.lbl.gov/Manuals/HDF5-1.8.7/UG/11_Datatypes.html)
    // and stackoverflow
    // https://stackoverflow.com/questions/6184817/hdf5-inserting-a-set-of-strings-in-a-dataset
    hid_t datatype = H5Tcopy(H5T_C_S1);
    H5Tset_size(datatype, H5T_VARIABLE);
    hsize_t dim = ref.size();

    // Create vector of pointers to the actual string data
    std::vector<const char*> char_list;
    for (int i = 0; i < ref.size(); i++)
      char_list.push_back(ref[i].data());

    hid_t h1   = H5Dopen(grp, aname.c_str(), H5P_DEFAULT);
    herr_t ret = -1;
    if (h1 < 0) // missing create one
    {
      hid_t dataspace = H5Screate_simple(1, &dim, NULL);
      hid_t dataset   = H5Dcreate(grp, aname.c_str(), datatype, dataspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
      ret             = H5Dwrite(dataset, datatype, H5S_ALL, H5S_ALL, xfer_plist, char_list.data());
      H5Sclose(dataspace);
      H5Dclose(dataset);
    }
    else
      ret = H5Dwrite(h1, datatype, H5S_ALL, H5S_ALL, xfer_plist, char_list.data());

    H5Dclose(h1);
    return ret >= 0;
  }

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The documentation for this struct was generated from the following file:

• /home/pk7/projects/qmc/for_cron_doxygen/qmcpack/src/io/hdf/hdf_stl.h