C++ abs template

template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
constexpr T abs(T n)
{
  	if constexpr (std::is_signed_v<T>)
  	{
    	return n >= 0 ? n : -n;
  	}
	return n;
}

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Error c4001 site:docs.microsoft.com
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