text: //
  // MIT License
  //
  // © ESI Group, 2015
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy of
  // this software and associated documentation files (the "Software"), to deal in
  // the Software without restriction, including without limitation the rights to
  // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  //
  // the Software, and to permit persons to whom the Software is furnished to do so,
  // subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in all
  // copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  //
  // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  #include <pvkernel/filter/PVChunkFilterByElt.h>
  #include <pvkernel/core/PVTextChunk.h> // for PVChunk, list_elts
  #include <pvkernel/core/PVElement.h>   // for PVElement
  
  #include <cstddef> // for size_t
  
  /******************************************************************************
   *
   * PVFilter::PVChunkFilterByElt::operator()
   *
   *****************************************************************************/
  PVCore::PVTextChunk* PVFilter::PVChunkFilterByElt::operator()(PVCore::PVTextChunk* chunk) const
  {
  	size_t nelts_valid = 0;
  
  	for (auto& elt_ : chunk->elements()) {
  		PVCore::PVElement& elt = (*_elt_filter)(*elt_);
  		if (elt.valid()) {
  			nelts_valid++;
  		}
  	}
  
  	chunk->set_elts_stat(chunk->elements().size(), nelts_valid);
  	return chunk;
  }
  