elastic_fixed_point.h

//          Copyright John McFarlane 2015 - 2016.
// 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(SG14_ELASTIC_FIXED_POINT_H)
#define SG14_ELASTIC_FIXED_POINT_H 1

#include "elastic_integer.h"
#include <sg14/fixed_point>

namespace sg14 {
    // sg14-specific definitions


    template<int IntegerDigits, int FractionalDigits = 0, class Narrowest = signed>
    using elastic_fixed_point = fixed_point<elastic_integer<IntegerDigits+FractionalDigits, Narrowest>, -FractionalDigits>;

    // sg14::make_elastic_fixed_point


    template<
            typename Narrowest = int,
            typename Integral = int,
            Integral Value = 0>
    constexpr elastic_fixed_point<_impl::max(_impl::used_bits_symmetric(Value), 1), -trailing_bits(Value), Narrowest>
    make_elastic_fixed_point(const_integer<Integral, Value> = const_integer<Integral, Value>{})
    {
        return Value;
    }

    // sg14::make_elastic_fixed_point


    template<class Narrowest = int, class Integral = int>
    constexpr elastic_fixed_point<std::numeric_limits<Integral>::digits, 0, Narrowest> 
    make_elastic_fixed_point(Integral value)
    {
        return {value};
    }

    // sg14::literals::operator "" _elastic


    namespace literals {
        template<char... Digits>
        constexpr auto operator "" _elastic()
        -> decltype(make_elastic_fixed_point<int, std::intmax_t, _const_integer_impl::digits_to_integral<Digits...>::value>()) {
            return make_elastic_fixed_point<int, std::intmax_t, _const_integer_impl::digits_to_integral<Digits...>::value>();
        }
    }
}

#endif // SG14_ELASTIC_FIXED_POINT_H