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/*=========================================================================
Program: Visualization Toolkit
Module: vtkVariantExtract.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 vtkVariantExtract
*
* Performs an explicit conversion from a vtkVariant to the type that it contains. Implicit
* conversions are *not* performed, so casting a vtkVariant containing one type (e.g. double)
* to a different type (e.g. string) will not convert between types.
*
* Callers should use the 'valid' flag to verify whether the extraction succeeded.
*
* @par Thanks:
* Developed by Timothy M. Shead (tshead@sandia.gov) at Sandia National Laboratories.
*/
#ifndef vtkVariantExtract_h
#define vtkVariantExtract_h
#include <typeinfo> // for typeid
template<typename T>
T vtkVariantExtract(const vtkVariant& value, bool& valid)
{
vtkGenericWarningMacro(
<< "Cannot convert vtkVariant containing [" << value.GetTypeAsString() << "] "
<< "to unsupported type [" << typeid(T).name() << "]. "
<< "Create a vtkVariantExtract<> specialization to eliminate this warning."
);
valid = false;
static T dummy;
return dummy;
}
template<>
inline char vtkVariantExtract<char>(const vtkVariant& value, bool& valid)
{
valid = value.IsChar();
return valid ? value.ToChar() : 0;
}
template<>
inline unsigned char vtkVariantExtract<unsigned char>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnsignedChar();
return valid ? value.ToUnsignedChar() : 0;
}
template<>
inline short vtkVariantExtract<short>(const vtkVariant& value, bool& valid)
{
valid = value.IsShort();
return valid ? value.ToShort() : 0;
}
template<>
inline unsigned short vtkVariantExtract<unsigned short>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnsignedShort();
return valid ? value.ToUnsignedShort() : 0;
}
template<>
inline int vtkVariantExtract<int>(const vtkVariant& value, bool& valid)
{
valid = value.IsInt();
return valid ? value.ToInt() : 0;
}
template<>
inline unsigned int vtkVariantExtract<unsigned int>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnsignedInt();
return valid ? value.ToUnsignedInt() : 0;
}
template<>
inline long vtkVariantExtract<long>(const vtkVariant& value, bool& valid)
{
valid = value.IsLong();
return valid ? value.ToLong() : 0;
}
template<>
inline unsigned long vtkVariantExtract<unsigned long>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnsignedLong();
return valid ? value.ToUnsignedLong() : 0;
}
template<>
inline long long vtkVariantExtract<long long>(const vtkVariant& value, bool& valid)
{
valid = value.IsLongLong();
return valid ? value.ToLongLong() : 0;
}
template<>
inline unsigned long long vtkVariantExtract<unsigned long long>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnsignedLongLong();
return valid ? value.ToUnsignedLongLong() : 0;
}
template<>
inline float vtkVariantExtract<float>(const vtkVariant& value, bool& valid)
{
valid = value.IsFloat();
return valid ? value.ToFloat() : 0.0f;
}
template<>
inline double vtkVariantExtract<double>(const vtkVariant& value, bool& valid)
{
valid = value.IsDouble();
return valid ? value.ToDouble() : 0.0;
}
template<>
inline vtkStdString vtkVariantExtract<vtkStdString>(const vtkVariant& value, bool& valid)
{
valid = value.IsString();
return valid ? value.ToString() : vtkStdString();
}
template<>
inline vtkUnicodeString vtkVariantExtract<vtkUnicodeString>(const vtkVariant& value, bool& valid)
{
valid = value.IsUnicodeString();
return valid ? value.ToUnicodeString() : vtkUnicodeString();
}
template<>
inline vtkVariant vtkVariantExtract<vtkVariant>(const vtkVariant& value, bool& valid)
{
valid = true;
return value;
}
#endif
// VTK-HeaderTest-Exclude: vtkVariantExtract.h
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