YODA::H5DataSetWriter< T > Class Template Reference

A helper class to deal with chunking of H5 datasets. More...

#include <H5Utils.h>

Public Member Functions
	H5DataSetWriter (YODA_H5::File &h5file, const string &label, size_t datalen, size_t chunksize, bool compress)
void	writeSlice (vector< T > &&data) noexcept
	Method to write a slice that may span multiple rows/columns.
template<typename U >
void	createAttribute (const string &label, vector< U > &&data) noexcept
	Method to decorate dataset with an attribute.
size_t	colPos () const noexcept
size_t	rowPos () const noexcept

Detailed Description

template<typename T>
class YODA::H5DataSetWriter< T >

A helper class to deal with chunking of H5 datasets.

Definition at line 158 of file H5Utils.h.

Constructor & Destructor Documentation

H5DataSetWriter()

template<typename T >

YODA::H5DataSetWriter< T >::H5DataSetWriter ( YODA_H5::File &  h5file, const string &  label, size_t  datalen, size_t  chunksize, bool  compress  )

inline

Definition at line 162 of file H5Utils.h.

          : _ncols(chunksize), _thiscol(0), _nrows(1+(datalen-1)/chunksize), _thisrow(0),
            _ds(H5DataSet<T>(h5file, label, _nrows, chunksize, compress)) {  }

Member Function Documentation

colPos()

template<typename T >

size_t YODA::H5DataSetWriter< T >::colPos ( ) const

inlinenoexcept

Definition at line 197 of file H5Utils.h.

{ return _thiscol; }

createAttribute()

template<typename T >

template<typename U >

void YODA::H5DataSetWriter< T >::createAttribute ( const string &  label, vector< U > &&  data  )

inlinenoexcept

Method to decorate dataset with an attribute.

Definition at line 193 of file H5Utils.h.

                                                                         {
      _ds.createAttribute(label, std::forward<vector<U>>(data));
    }

rowPos()

template<typename T >

size_t YODA::H5DataSetWriter< T >::rowPos ( ) const

inlinenoexcept

Definition at line 199 of file H5Utils.h.

{ return _thisrow; }

writeSlice()

template<typename T >

void YODA::H5DataSetWriter< T >::writeSlice ( vector< T > &&  data )

inlinenoexcept

Method to write a slice that may span multiple rows/columns.

Definition at line 168 of file H5Utils.h.

                                               {
 
      if (data.empty())  return;
 
      size_t offset = 0, len = data.size();
      const auto itr = data.cbegin();
      while (len) {
        vector<T> tmp;
        size_t ncols = std::min(len, _ncols - _thiscol);
        auto first = itr + offset;
        auto last = first + ncols;
        _ds.select({_thisrow,_thiscol},
                   {1,ncols}).write(vector<vector<T>>{{std::make_move_iterator(first),
                                                       std::make_move_iterator(last)}});
        offset += ncols;
        _thiscol += ncols;
        if (_thiscol == _ncols) {
          _thiscol = 0; ++_thisrow;
        }
        len -= ncols;
      }
    }

References YODA::write().

Referenced by YODA::WriterH5::writeAOS().

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

• include/YODA/Utils/H5Utils.h