ITK  5.3.0
Insight Toolkit
itkStaticAssert.h
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1 /*=========================================================================
2  *
3  * Copyright NumFOCUS
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
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9  * http://www.apache.org/licenses/LICENSE-2.0.txt
10  *
11  * Unless required by applicable law or agreed to in writing, software
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13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
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16  *
17  *=========================================================================*/
18 
19 #ifndef itkStaticAssert_h
20 #define itkStaticAssert_h
21 
22 #include "itkMacro.h"
23 
24 #if ITK_COMPILER_CXX_STATIC_ASSERT
25 // Use the C++11 static_assert if available
26 
35 # define itkStaticAssert(expr, str) static_assert(expr, str)
36 #elif defined(__GNUC__) && !defined(__INTEL_COMPILER)
37 // This trick restricts the static assertion to non global contexts (-> functions)
38 # define itkStaticAssert(expr, str) \
39  ({ \
40  extern int __attribute__((error(str))) StaticAssertFailure(); \
41  ((void)((expr) ? 0 : StaticAssertFailure()), 0); \
42  })
43 #else
44 // Usual trick (boost, clang, ...), but it will loose the error message on the
45 // way
46 # define ITK_JOIN(X, Y) ITK_DO_JOIN(X, Y)
47 # define ITK_DO_JOIN(X, Y) ITK_DO_JOIN2(X, Y)
48 # define ITK_DO_JOIN2(X, Y) X##Y
49 
50 
51 namespace itk
52 {
54 
58 template <bool V>
59 struct StaticAssertFailure;
60 template <>
61 struct StaticAssertFailure<true>
62 {};
64 } // namespace itk
65 
66 # define itkStaticAssert(expr, str) \
67  enum \
68  { \
69  ITK_JOIN(static_assert_typedef, __LINE__) = sizeof(itk::StaticAssertFailure<((expr) == 0 ? false : true)>) \
70  };
71 #endif
72 
73 #endif // itkStaticAssert_h
itkMacro.h
itk
The "itk" namespace contains all Insight Segmentation and Registration Toolkit (ITK) classes....
Definition: itkAnnulusOperator.h:24