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165 lines
4.2 KiB
C++
165 lines
4.2 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkVariantCast.h
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-------------------------------------------------------------------------
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Copyright 2008 Sandia Corporation.
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Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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the U.S. Government retains certain rights in this software.
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-------------------------------------------------------------------------
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkVariantCast
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*
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* Converts a vtkVariant to some other type. Wherever possible, implicit conversions are
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* performed, so this method can be used to convert from nearly any type to a string, or
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* from a string to nearly any type. Note that some conversions may fail at runtime, such
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* as a conversion from the string "abc" to a numeric type.
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*
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* The optional 'valid' flag can be used by callers to verify whether conversion succeeded.
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*
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* @par Thanks:
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* Developed by Timothy M. Shead (tshead@sandia.gov) at Sandia National Laboratories.
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*/
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#ifndef vtkVariantCast_h
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#define vtkVariantCast_h
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#include "vtkUnicodeString.h"
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#include <typeinfo> // for warnings
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template <typename T>
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T vtkVariantCast(const vtkVariant& value, bool* valid = nullptr)
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{
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vtkGenericWarningMacro(<< "Cannot convert vtkVariant containing [" << value.GetTypeAsString()
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<< "] "
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<< "to unsupported type [" << typeid(T).name() << "]. "
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<< "Create a vtkVariantCast<> specialization to eliminate this warning.");
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if (valid)
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*valid = false;
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static T dummy;
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return dummy;
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}
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template <>
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inline char vtkVariantCast<char>(const vtkVariant& value, bool* valid)
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{
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return value.ToChar(valid);
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}
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template <>
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inline signed char vtkVariantCast<signed char>(const vtkVariant& value, bool* valid)
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{
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return value.ToSignedChar(valid);
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}
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template <>
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inline unsigned char vtkVariantCast<unsigned char>(const vtkVariant& value, bool* valid)
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{
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return value.ToUnsignedChar(valid);
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}
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template <>
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inline short vtkVariantCast<short>(const vtkVariant& value, bool* valid)
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{
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return value.ToShort(valid);
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}
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template <>
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inline unsigned short vtkVariantCast<unsigned short>(const vtkVariant& value, bool* valid)
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{
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return value.ToUnsignedShort(valid);
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}
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template <>
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inline int vtkVariantCast<int>(const vtkVariant& value, bool* valid)
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{
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return value.ToInt(valid);
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}
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template <>
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inline unsigned int vtkVariantCast<unsigned int>(const vtkVariant& value, bool* valid)
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{
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return value.ToUnsignedInt(valid);
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}
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template <>
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inline long vtkVariantCast<long>(const vtkVariant& value, bool* valid)
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{
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return value.ToLong(valid);
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}
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template <>
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inline unsigned long vtkVariantCast<unsigned long>(const vtkVariant& value, bool* valid)
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{
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return value.ToUnsignedLong(valid);
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}
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template <>
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inline long long vtkVariantCast<long long>(const vtkVariant& value, bool* valid)
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{
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return value.ToLongLong(valid);
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}
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template <>
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inline unsigned long long vtkVariantCast<unsigned long long>(const vtkVariant& value, bool* valid)
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{
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return value.ToUnsignedLongLong(valid);
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}
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template <>
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inline float vtkVariantCast<float>(const vtkVariant& value, bool* valid)
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{
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return value.ToFloat(valid);
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}
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template <>
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inline double vtkVariantCast<double>(const vtkVariant& value, bool* valid)
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{
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return value.ToDouble(valid);
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}
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template <>
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inline vtkStdString vtkVariantCast<vtkStdString>(const vtkVariant& value, bool* valid)
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{
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if (valid)
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*valid = true;
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return value.ToString();
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}
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template <>
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inline vtkUnicodeString vtkVariantCast<vtkUnicodeString>(const vtkVariant& value, bool* valid)
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{
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if (valid)
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*valid = true;
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return value.ToUnicodeString();
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}
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template <>
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inline vtkVariant vtkVariantCast<vtkVariant>(const vtkVariant& value, bool* valid)
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{
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if (valid)
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*valid = true;
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return value;
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}
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#endif
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// VTK-HeaderTest-Exclude: vtkVariantCast.h
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