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* Copyright (c) 2019 - present Advanced Micro Devices, Inc. All rights reserved.
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*
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*******************************************************************************/

/*! @file blis_util.hh
 *  blis_util.hh defines all the utility functions to be invoked in CPP template
 *  interfaces
 *  */

#ifndef BLIS_UTIL_HH
#define BLIS_UTIL_HH


namespace blis {


// -----------------------------------------------------------------------------
// for any combination of types, determine associated real, scalar,
// and complex types.
//
// real_type< float >                               is float
// real_type< float, double, complex<float> >       is double
//
// scalar_type< float >                             is float
// scalar_type< float, complex<float> >             is complex<float>
// scalar_type< float, double, complex<float> >     is complex<double>
//
// complex_type< float >                            is complex<float>
// complex_type< float, double >                    is complex<double>
// complex_type< float, double, complex<float> >    is complex<double>

// for zero types
template< typename... Types >
struct real_type_traits;

// define real_type<> type alias
template< typename... Types >
using real_type = typename real_type_traits< Types... >::real_t;

// for one type
template< typename T >
struct real_type_traits<T>
{
    using real_t = T;
};

// for one complex type, strip complex
template< typename T >
struct real_type_traits< std::complex<T> >
{
    using real_t = T;
};
}  // namespace blis

#endif        //  #ifndef BLIS_UTIL_HH