vtkVariantCast.h

Go to the documentation of this file.

/*=========================================================================
 
  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.
 
=========================================================================*/
 
#ifndef vtkVariantCast_h
#define vtkVariantCast_h
 
#include "vtkVariant.h"
#include <typeinfo> // for warnings
 
template <typename T>
T vtkVariantCast(const vtkVariant& value, bool* valid = nullptr)
{
  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 <>
VTKCOMMONCORE_EXPORT VTK_DEPRECATED_IN_9_1_0(
  "Use vtkStdString vtkVariantCast<vtkStdString>(const vtkVariant& value, bool* valid)")
  vtkUnicodeString vtkVariantCast<vtkUnicodeString>(const vtkVariant& value, bool* valid);
 
template <>
inline vtkVariant vtkVariantCast<vtkVariant>(const vtkVariant& value, bool* valid)
{
  if (valid)
    *valid = true;
 
  return value;
}
 
#endif
 
// VTK-HeaderTest-Exclude: vtkVariantCast.h