static_number.h

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//          Copyright John McFarlane 2015 - 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_STATIC_NUBER_H)
#define CNL_STATIC_NUBER_H
 
 
#include "_impl/static_integer.h"
#include "_impl/wrapper/tag_of.h"
#include "integer.h"
#include "scaled_integer.h"
 
#include <limits>
 
namespace cnl {
    template<
            int Digits, int Exponent = 0, rounding_tag RoundingTag = nearest_rounding_tag,
            overflow_tag OverflowTag = undefined_overflow_tag, integer Narrowest = int>
    using static_number = scaled_integer<
            _impl::static_integer<Digits, RoundingTag, OverflowTag, Narrowest>, power<Exponent>>;
 
    template<
            rounding_tag RoundingTag = nearest_rounding_tag, overflow_tag OverflowTag = undefined_overflow_tag,
            integer Narrowest = int, class Input = int>
    [[nodiscard]] constexpr auto make_static_number(Input const& input)
            -> static_number<std::numeric_limits<Input>::digits, 0, RoundingTag, OverflowTag, Narrowest>
    {
        return input;
    }
 
    template<
            rounding_tag RoundingTag = _impl::tag_of_t<rounding_integer<>>,
            overflow_tag OverflowTag = _impl::tag_of_t<overflow_integer<>>, integer Narrowest = int,
            class Input = int, CNL_IMPL_CONSTANT_VALUE_TYPE Value>
    [[nodiscard]] constexpr auto make_static_number(constant<Value> const&) -> static_number<
            _impl::used_digits(Value) - trailing_bits(Value), trailing_bits(Value), RoundingTag,
            OverflowTag, Narrowest>
    {
        return constant<Value>{};
    }
}
 
#endif  // CNL_STATIC_NUBER_H