Boost C++ Libraries

boost/math/tools/complex.hpp

//  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.
//

#ifndef BOOST_MATH_TOOLS_COMPLEX_HPP
#define BOOST_MATH_TOOLS_COMPLEX_HPP

#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;
         };


} } }

#endif // BOOST_MATH_TOOLS_COMPLEX_HPP