wrap.h

 
//          Copyright John McFarlane 2018.
// Distributed under 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)
 
#if !defined(CNL_IMPL_NUM_TRAITS_WRAP_H)
#define CNL_IMPL_NUM_TRAITS_WRAP_H
 
#include "is_composite.h"
#include "rep_of.h"
 
namespace cnl {
    namespace _impl {
        template<typename Number, typename Rep>
        struct wrap;
 
        template<typename Number, typename Rep>
        requires(!is_composite_v<Number>) struct wrap<Number, Rep> {
            [[nodiscard]] constexpr auto operator()(Rep const& n) const
            {
                return n;
            }
        };
 
        template<typename Number, typename Rep>
        requires(is_composite_v<Number>) struct wrap<Number, Rep> {
            [[nodiscard]] constexpr auto operator()(Rep const& rep) const
            {
                return from_rep<Number>(wrap<rep_of_t<Number>, Rep>{}(rep));
            }
        };
    }
 
    template<typename Number, typename Rep>
    [[nodiscard]] constexpr auto wrap(Rep const& rep)
    {
        return _impl::wrap<Number, Rep>{}(rep);
    }
}
 
#endif  // CNL_IMPL_NUM_TRAITS_WRAP_H