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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTryDowncast.h
-------------------------------------------------------------------------
Copyright 2008 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include <vtkDenseArray.h>
#include <vtkSmartPointer.h>
#include <vtkSparseArray.h>
#include <boost/mpl/for_each.hpp>
#include <boost/mpl/joint_view.hpp>
#include <boost/mpl/vector.hpp>
// These are lists of standard VTK types. End-users will have to choose these when they implement
// their algorithms.
// Description:
// Enumerates all integer VTK types
typedef boost::mpl::vector<vtkTypeUInt8, vtkTypeInt8, vtkTypeUInt16, vtkTypeInt16, vtkTypeUInt32, vtkTypeInt32, vtkTypeUInt64, vtkTypeInt64, vtkIdType> vtkIntegerTypes;
// Description:
// Enumerates all floating-point VTK types
typedef boost::mpl::vector<vtkTypeFloat32, vtkTypeFloat64> vtkFloatingPointTypes;
// Description:
// Enumerates all numeric VTK types
typedef boost::mpl::joint_view<vtkIntegerTypes, vtkFloatingPointTypes> vtkNumericTypes;
// Description:
// Enumerates all string VTK types
typedef boost::mpl::vector<vtkStdString, vtkUnicodeString> vtkStringTypes;
// Description:
// Enumerates all VTK types
typedef boost::mpl::joint_view<vtkNumericTypes, vtkStringTypes> vtkAllTypes;
// End-users can ignore these, they're the guts of the beast ...
template<template <typename> class TargetT, typename FunctorT>
class vtkTryDowncastHelper1
{
public:
vtkTryDowncastHelper1(vtkObject* source1, FunctorT functor, bool& succeeded) :
Source1(source1),
Functor(functor),
Succeeded(succeeded)
{
}
template<typename ValueT>
void operator()(ValueT) const
{
if(Succeeded)
return;
TargetT<ValueT>* const target1 = TargetT<ValueT>::SafeDownCast(Source1);
if(target1)
{
Succeeded = true;
this->Functor(target1);
}
}
vtkObject* Source1;
FunctorT Functor;
bool& Succeeded;
private:
vtkTryDowncastHelper1& operator=(const vtkTryDowncastHelper1&);
};
template<template <typename> class TargetT, typename FunctorT>
class vtkTryDowncastHelper2
{
public:
vtkTryDowncastHelper2(vtkObject* source1, vtkObject* source2, FunctorT functor, bool& succeeded) :
Source1(source1),
Source2(source2),
Functor(functor),
Succeeded(succeeded)
{
}
template<typename ValueT>
void operator()(ValueT) const
{
if(Succeeded)
return;
TargetT<ValueT>* const target1 = TargetT<ValueT>::SafeDownCast(Source1);
TargetT<ValueT>* const target2 = TargetT<ValueT>::SafeDownCast(Source2);
if(target1 && target2)
{
Succeeded = true;
this->Functor(target1, target2);
}
}
vtkObject* Source1;
vtkObject* Source2;
FunctorT Functor;
bool& Succeeded;
private:
vtkTryDowncastHelper2& operator=(const vtkTryDowncastHelper2&);
};
template<template <typename> class TargetT, typename FunctorT>
class vtkTryDowncastHelper3
{
public:
vtkTryDowncastHelper3(vtkObject* source1, vtkObject* source2, vtkObject* source3, FunctorT functor, bool& succeeded) :
Source1(source1),
Source2(source2),
Source3(source3),
Functor(functor),
Succeeded(succeeded)
{
}
template<typename ValueT>
void operator()(ValueT) const
{
if(Succeeded)
return;
TargetT<ValueT>* const target1 = TargetT<ValueT>::SafeDownCast(Source1);
TargetT<ValueT>* const target2 = TargetT<ValueT>::SafeDownCast(Source2);
TargetT<ValueT>* const target3 = TargetT<ValueT>::SafeDownCast(Source3);
if(target1 && target2 && target3)
{
Succeeded = true;
this->Functor(target1, target2, target3);
}
}
vtkObject* Source1;
vtkObject* Source2;
vtkObject* Source3;
FunctorT Functor;
bool& Succeeded;
private:
vtkTryDowncastHelper3& operator=(const vtkTryDowncastHelper3&);
};
template<template <typename> class TargetT, typename TypesT, typename FunctorT>
bool vtkTryDowncast(vtkObject* source1, FunctorT functor)
{
bool succeeded = false;
boost::mpl::for_each<TypesT>(vtkTryDowncastHelper1<TargetT, FunctorT>(source1, functor, succeeded));
return succeeded;
}
template<template <typename> class TargetT, typename TypesT, typename FunctorT>
bool vtkTryDowncast(vtkObject* source1, vtkObject* source2, FunctorT functor)
{
bool succeeded = false;
boost::mpl::for_each<TypesT>(vtkTryDowncastHelper2<TargetT, FunctorT>(source1, source2, functor, succeeded));
return succeeded;
}
template<template <typename> class TargetT, typename TypesT, typename FunctorT>
bool vtkTryDowncast(vtkObject* source1, vtkObject* source2, vtkObject* source3, FunctorT functor)
{
bool succeeded = false;
boost::mpl::for_each<TypesT>(vtkTryDowncastHelper3<TargetT, FunctorT>(source1, source2, source3, functor, succeeded));
return succeeded;
}
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