/*
* Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otbOGRGeometriesVisitor_h
#define otbOGRGeometriesVisitor_h
#include
#include
#include
#include
#include "ogr_geometry.h"
namespace otb
{
namespace ogr
{
/**\ingroup boost
* \brief propagation of const-qualifier.
* \note This type traits is likelly to appear in boost at some point in time.
* \note As a consequence, it follows C++ standard and boost naming policy.
* \since OTB v 3.14.0
* @{
*/
template
struct propagate_const
{ typedef Tout type; };
template
struct propagate_const
{ typedef typename boost::add_const::type type; };
/** @} */
#define TRY_APPLY(TYPE, geometry, functor) \
if (typename propagate_const::type * dc_##TYPE \
= dynamic_cast::type*>(geometry))\
{\
return functor(dc_##TYPE); \
}
/**\ingroup gGeometry
* External polymorphic call of functions on \c OGRGeometry.
* This helper function tries to polymorphically dispatch the call of a function
* on the right \c OGRGeometry subtype.
* \internal
* In a perfect world, \c OGRGeometry would have provided a visitor to extend
* the number of functions to polymorphically %apply on them. As this isn't the
* case, \c apply executes many downcasts until it finds the right subtype.
*
* \tparam TResult type of the result
* \tparam TGeometry matched an \c OGRGeometry that may or may not be const
* qualified.
* \tparam TFunctor functor to apply on the geometry.
* \todo Support a list of types to check
* \since OTB v 3.14.0
*/
template
TResult apply(TGeometry * geometry, TFunctor functor)
{
BOOST_MPL_ASSERT((boost::is_same::type >));
TRY_APPLY(OGRPoint, geometry, functor)
else TRY_APPLY(OGRLinearRing, geometry, functor)
else TRY_APPLY(OGRLineString, geometry, functor)
// else TRY_APPLY(OGRCurve, geometry, functor)
else TRY_APPLY(OGRPolygon, geometry, functor)
// else TRY_APPLY(OGRSurface, geometry, functor)
else TRY_APPLY(OGRMultiLineString, geometry, functor)
else TRY_APPLY(OGRMultiPoint, geometry, functor)
else TRY_APPLY(OGRMultiPolygon, geometry, functor)
else TRY_APPLY(OGRGeometryCollection, geometry, functor)
{
// functor(geometry);
}
return TResult(); // keep compiler happy
}
} // ogr namespace
} // end namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
// #include "otbOGRGeometriesVisitor.hxx"
#endif
#endif // otbOGRGeometriesVisitor_h