52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
/// @file grotto/gadgets/elementary/approx.hpp
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/// @author Ryan Henry <ryan.henry@ucalgary.ca>
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/// @brief
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/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
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/// @license Released under a GNU General Public v2.0 (GPLv2) license;
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/// see [LICENSE.md](@ref GPLv2) for details.
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#ifndef LIBDPF_INCLUDE_GROTTO_GADGETS_ELEMENTARY_APPROX_HPP__
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#define LIBDPF_INCLUDE_GROTTO_GADGETS_ELEMENTARY_APPROX_HPP__
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#include <cmath>
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#include <array>
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#include <limits>
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#include "grotto/gadget_hints.hpp"
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namespace grotto
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{
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namespace gadgets
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{
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static constexpr double approx_default_target = 0;
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static constexpr unsigned approx_default_ULPs = 1;
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template <double const & target = approx_default_target,
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unsigned const & ULPs = approx_default_ULPs>
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struct approx
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{
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template <typename T>
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T operator()(T x) { return std::abs(x - target) <= ULPs * ulp_of(target) ? 1 : 0; }
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};
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template <double const & target,
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unsigned const & ULPs>
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struct gadget_hints<approx<target, ULPs>>
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{
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static constexpr double min = std::numeric_limits<double>::min();
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static constexpr double max = std::numeric_limits<double>::max();
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static constexpr unsigned degree = 0;
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static constexpr double poles[] = { };
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static constexpr bool has_canonical_representation = true;
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static constexpr double interesting_points[] = { target - ULPs * ulp_of(target), target + ULPs * ulp_of(target) };
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static constexpr double canonical_bounds[] = { target - ULPs * ulp_of(target), target + ULPs * ulp_of(target), target + ULPs * ulp_of(target) };
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static constexpr std::array<double, degree+1> canonical_polys[] = { 0, 1, 1, 0 };
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};
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} // namespace gadgets
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} // namespace grotto
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#endif // LIBDPF_INCLUDE_GROTTO_GADGETS_ELEMENTARY_APPROX_HPP__
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