Remove "using namespace std;" from C++ code

[Kurt Schwehr]

It would be more obvious to readers if these are switched to using-declarations. e.g.

using std::map;

Existing that I propose removing:

find gdal -name \*.cpp -o -name \*.h | xargs egrep 'using namespace std'
gdal/frmts/kmlsuperoverlay/kmlsuperoverlaydataset.cpp:using namespace std;
gdal/frmts/msg/msgcommand.cpp:using namespace std;
gdal/frmts/msg/reflectancecalculator.cpp:using namespace std;
gdal/ogr/ogrsf_frmts/geojson/ogrgeojsondatasource.cpp:using namespace std;
gdal/ogr/ogrsf_frmts/ili/ili2reader.cpp:using namespace std;
gdal/ogr/ogrsf_frmts/ili/ogrili2datasource.cpp:using namespace std;
gdal/ogr/ogrsf_frmts/libkml/ogrlibkmlfeaturestyle.cpp:using namespace std;
gdal/swig/php/gdal_wrap.cpp:using namespace std;
gdal/swig/php/ogr_wrap.cpp:using namespace std;
gdal/swig/php/osr_wrap.cpp:using namespace std;
gdal/swig/python/extensions/gdal_wrap.cpp:using namespace std;
gdal/swig/python/extensions/ogr_wrap.cpp:using namespace std;
gdal/swig/python/extensions/osr_wrap.cpp:using namespace std;

There are already some:

find gdal -name \*.cpp | xargs egrep 'using std::'
gdal/frmts/elas/elasdataset.cpp:using std::fill;
gdal/frmts/ilwis/ilwiscoordinatesystem.cpp:using std::string;
gdal/frmts/ilwis/ilwisdataset.cpp:using std::string;
gdal/frmts/ingr/IntergraphBand.cpp:using std::fill;
gdal/frmts/raw/dipxdataset.cpp:using std::fill;
gdal/ogr/ogrsf_frmts/filegdb/FGdbDatasource.cpp:using std::vector;
gdal/ogr/ogrsf_frmts/filegdb/FGdbDatasource.cpp:using std::wstring;
gdal/ogr/ogrsf_frmts/filegdb/FGdbLayer.cpp:using std::string;
gdal/ogr/ogrsf_frmts/filegdb/FGdbLayer.cpp:using std::wstring;
gdal/ogr/ogrsf_frmts/filegdb/FGdbResultLayer.cpp:using std::string;
gdal/ogr/ogrsf_frmts/filegdb/FGdbResultLayer.cpp:using std::wstring;
gdal/ogr/ogrsf_frmts/filegdb/FGdbUtils.cpp:using std::string;

[Even Rouault]

This ticket has been automatically closed because Trac is no longer used for GDAL bug tracking, since the project has migrated to GitHub. If you believe this ticket is still valid, you may file it to ​https://github.com/OSGeo/gdal/issues if it is not already reported there.