absolute_error.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_VALUE_FUNCTIONS_ABSOLUTE_ERROR_H
#define pRC_CORE_VALUE_FUNCTIONS_ABSOLUTE_ERROR_H
 
#include <prc/core/functors/eval.hpp>
#include <prc/core/functors/norm.hpp>
#include <prc/core/functors/sub.hpp>
#include <prc/core/value/functions/eval.hpp>
#include <prc/core/value/functions/norm.hpp>
#include <prc/core/value/functions/sub.hpp>
 
namespace pRC
{
    template<class XA, class XB>
        requires IsInvocable<Sub, XA, XB> &&
        IsInvocable<Norm<>, ResultOf<Sub, XA, XB>>
    static inline constexpr auto absoluteError(XA &&a, XB &&b)
    {
        auto const err = [&a, &b]()
        {
            if constexpr(IsUnsignedInteger<Value<ResultOf<Sub, XA, XB>>>)
            {
                return norm(delta(a, b));
            }
            else
            {
                return norm(a - b);
            }
        }();
 
        return Value<decltype(err)>(err);
    }
}
#endif // pRC_CORE_VALUE_FUNCTIONS_ABSOLUTE_ERROR_H