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code_isotrope/boost/math/tools/complex.hpp

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+//  Copyright John Maddock 2018.
+//  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)
+
+//
+// Tools for operator on complex as well as scalar types.
+//
+
+#include <boost/type_traits/is_complex.hpp>
+
+namespace boost {
+   namespace math {
+      namespace tools {
+
+         //
+         // Speicalize this trait for user-defined complex types (ie Boost.Multiprecision):
+         //
+         template <class T>
+         struct is_complex_type : public boost::is_complex<T> {};
+         //
+         // Use this trait to typecast integer literals to something
+         // that will interoperate with T:
+         //
+         template <class T, bool = is_complex_type<T>::value>
+         struct integer_scalar_type
+         {
+            typedef int type;
+         };
+         template <class T>
+         struct integer_scalar_type<T, true>
+         {
+            typedef typename T::value_type type;
+         };
+         template <class T, bool = is_complex_type<T>::value>
+         struct unsigned_scalar_type
+         {
+            typedef unsigned type;
+         };
+         template <class T>
+         struct unsigned_scalar_type<T, true>
+         {
+            typedef typename T::value_type type;
+         };
+         template <class T, bool = is_complex_type<T>::value>
+         struct scalar_type
+         {
+            typedef T type;
+         };
+         template <class T>
+         struct scalar_type<T, true>
+         {
+            typedef typename T::value_type type;
+         };
+
+
+} } }