ITK  4.13.0
Insight Segmentation and Registration Toolkit
itkIsConvertible.h
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1 /*=========================================================================
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3  * Copyright Insight Software Consortium
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
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18 #ifndef itkIsConvertible_h
19 #define itkIsConvertible_h
20 
22 
23 namespace itk
24 {
25 
28 namespace mpl
29 {
30 namespace Details
31 {
32 
38 struct SfinaeTypes
39  {
40  typedef char TOne;
41  typedef struct { char arr__[2]; } TTwo;
42  };
43 } // Details namespace
44 
56 template <typename TFrom, typename TTo>
57 struct IsConvertible
58 : private Details::SfinaeTypes
59 {
60 private:
61  static TOne Test(TTo);
62  static TTwo Test(...);
63  static TFrom MakeT();
64 public:
65  static ITK_CONSTEXPR_VAR bool Value = sizeof(Test(MakeT())) == sizeof(TOne);
66 };
68 
69 } // itk::mpl namespace
70 
71 // itk::IsConvertible has moved to itk::mpl.
72 // Expect itk::IsConvertible to be deprecated.
73 using mpl::IsConvertible;
74 
77 } // itk namespace
78 #endif // itkIsConvertible_h