# pragma warning(disable:4127) //conditional expression is constant
#endif
+//////////////// static assert /////////////////
+
+#define CVAUX_CONCAT_EXP(a, b) a##b
+#define CVAUX_CONCAT(a, b) CVAUX_CONCAT_EXP(a,b)
+
+#ifdef __cplusplus
+# if defined(__clang__)
+# ifndef __has_extension
+# define __has_extension __has_feature /* compatibility, for older versions of clang */
+# endif
+# if __has_extension(cxx_static_assert)
+# define CV_StaticAssert(condition, reason) static_assert((condition), reason " " #condition)
+# endif
+# elif defined(__GNUC__)
+# if (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
+# define CV_StaticAssert(condition, reason) static_assert((condition), reason " " #condition)
+# endif
+# elif defined(_MSC_VER)
+# if _MSC_VER >= 1600 /* MSVC 10 */
+# define CV_StaticAssert(condition, reason) static_assert((condition), reason " " #condition)
+# endif
+# endif
+# ifndef CV_StaticAssert
+# if defined(__GNUC__) && (__GNUC__ > 3) && (__GNUC_MINOR__ > 2)
+# define CV_StaticAssert(condition, reason) ({ extern int __attribute__((error("CV_StaticAssert: " reason " " #condition))) CV_StaticAssert(); ((condition) ? 0 : CV_StaticAssert()), 0; })
+# else
+ namespace cv {
+ template <bool x> struct CV_StaticAssert_failed;
+ template <> struct CV_StaticAssert_failed<true> { enum { val = 1 }; };
+ template<int x> struct CV_StaticAssert_test{};
+ }
+# define CV_StaticAssert(condition, reason)\
+ typedef cv::CV_StaticAssert_test< sizeof(cv::CV_StaticAssert_failed< static_cast<bool>(condition) >) > CVAUX_CONCAT(CV_StaticAssert_failed_at_, __LINE__)
+# endif
+# endif
+#endif
+
namespace cv
{