整理

include/boost/numeric/odeint/tools/traits.hpp

@@ -0,0 +1,39 @@
+//  Copyright Matt Borland 2021 - 2023.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_NUMERIC_ODEINT_TOOLS_TRAITS
+#define BOOST_NUMERIC_ODEINT_TOOLS_TRAITS
+
+#include <type_traits>
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+namespace detail {
+
+#define BOOST_NUMERIC_ODEINT_HAS_NAMED_TRAIT(trait, name)               \
+template <typename T>                                                   \
+class trait                                                             \
+{                                                                       \
+private:                                                                \
+   using yes = char;                                                    \
+   struct no { char x[2]; };                                            \
+                                                                        \
+   template <typename U>                                                \
+   static yes test(typename U::name* = nullptr);                        \
+                                                                        \
+   template <typename U>                                                \
+   static no test(...);                                                 \
+                                                                        \
+public:                                                                 \
+   static constexpr bool value = (sizeof(test<T>(0)) == sizeof(char));  \
+};
+
+} //namespace detail
+} //namespace odeint
+} //namespace numeric
+} //namespace boost
+
+#endif //BOOST_NUMERIC_ODEINT_TOOLS_TRAITS