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/*=========================================================================
Program: Visualization Toolkit
Module: vtkVariantCast.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.
=========================================================================*/
/**
* @class vtkVariantCast
*
* Converts a vtkVariant to some other type. Wherever possible, implicit conversions are
* performed, so this method can be used to convert from nearly any type to a string, or
* from a string to nearly any type. Note that some conversions may fail at runtime, such
* as a conversion from the string "abc" to a numeric type.
*
* The optional 'valid' flag can be used by callers to verify whether conversion succeeded.
*
* @par Thanks:
* Developed by Timothy M. Shead (tshead@sandia.gov) at Sandia National Laboratories.
*/
#ifndef vtkVariantCast_h
#define vtkVariantCast_h
#include "vtkUnicodeString.h"
#include <typeinfo> // for warnings
template<typename T>
T vtkVariantCast(const vtkVariant& value, bool* valid = 0)
{
vtkGenericWarningMacro(
<< "Cannot convert vtkVariant containing [" << value.GetTypeAsString() << "] "
<< "to unsupported type [" << typeid(T).name() << "]. "
<< "Create a vtkVariantCast<> specialization to eliminate this warning."
);
if(valid)
*valid = false;
static T dummy;
return dummy;
}
template<>
inline char vtkVariantCast<char>(const vtkVariant& value, bool* valid)
{
return value.ToChar(valid);
}
template<>
inline signed char vtkVariantCast<signed char>(const vtkVariant& value, bool* valid)
{
return value.ToSignedChar(valid);
}
template<>
inline unsigned char vtkVariantCast<unsigned char>(const vtkVariant& value, bool* valid)
{
return value.ToUnsignedChar(valid);
}
template<>
inline short vtkVariantCast<short>(const vtkVariant& value, bool* valid)
{
return value.ToShort(valid);
}
template<>
inline unsigned short vtkVariantCast<unsigned short>(const vtkVariant& value, bool* valid)
{
return value.ToUnsignedShort(valid);
}
template<>
inline int vtkVariantCast<int>(const vtkVariant& value, bool* valid)
{
return value.ToInt(valid);
}
template<>
inline unsigned int vtkVariantCast<unsigned int>(const vtkVariant& value, bool* valid)
{
return value.ToUnsignedInt(valid);
}
template<>
inline long vtkVariantCast<long>(const vtkVariant& value, bool* valid)
{
return value.ToLong(valid);
}
template<>
inline unsigned long vtkVariantCast<unsigned long>(const vtkVariant& value, bool* valid)
{
return value.ToUnsignedLong(valid);
}
template<>
inline long long vtkVariantCast<long long>(const vtkVariant& value, bool* valid)
{
return value.ToLongLong(valid);
}
template<>
inline unsigned long long vtkVariantCast<unsigned long long>(const vtkVariant& value, bool* valid)
{
return value.ToUnsignedLongLong(valid);
}
template<>
inline float vtkVariantCast<float>(const vtkVariant& value, bool* valid)
{
return value.ToFloat(valid);
}
template<>
inline double vtkVariantCast<double>(const vtkVariant& value, bool* valid)
{
return value.ToDouble(valid);
}
template<>
inline vtkStdString vtkVariantCast<vtkStdString>(const vtkVariant& value, bool* valid)
{
if(valid)
*valid = true;
return value.ToString();
}
template<>
inline vtkUnicodeString vtkVariantCast<vtkUnicodeString>(const vtkVariant& value, bool* valid)
{
if(valid)
*valid = true;
return value.ToUnicodeString();
}
template<>
inline vtkVariant vtkVariantCast<vtkVariant>(const vtkVariant& value, bool* valid)
{
if(valid)
*valid = true;
return value;
}
#endif
// VTK-HeaderTest-Exclude: vtkVariantCast.h
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