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Initial import of libdpf.

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Co-authored-by: Cursor <cursoragent@cursor.com>
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Ryan Henry 2026-09-24 14:08:32 -06:00
commit e4e666f459
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include/grotto/piecewise.hpp Normal file
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/// @file grotto/piecewise.hpp
/// @author Ryan Henry <ryan.henry@ucalgary.ca>
/// @brief
/// @details
/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
/// @license Released under a GNU General Public v2.0 (GPLv2) license;
/// see [LICENSE.md](@ref GPLv2) for details.
#ifndef LIBDPF_INCLUDE_GROTTO_PIECEWISE_HPP__
#define LIBDPF_INCLUDE_GROTTO_PIECEWISE_HPP__
#include <array>
#include <iterator>
#include <algorithm>
namespace grotto
{
namespace polynomials
{
template <typename T> using poly_constant = std::array<T, 1>;
template <typename T> using poly_linear = std::array<T, 2>;
template <typename T> using poly_quadratic = std::array<T, 3>;
template <typename T> using poly_cubic = std::array<T, 4>;
template <typename T>
constexpr auto eval_horner(const poly_constant<T> & f, T x) { return f[0]; }
template <typename T>
constexpr auto eval_horner(const poly_linear<T> & f, T x) { return f[1] * x + f[0]; }
template <typename T>
constexpr auto eval_horner(const poly_quadratic<T> & f, T x) { return (f[2] * x + f[1]) * x + f[0]; }
template <typename T>
constexpr auto eval_horner(const poly_cubic<T> & f, T x) { return ((f[3] * x + f[2]) * x + f[1]) * x + f[0]; }
template <typename T, std::size_t D, std::size_t N1, std::size_t N2>
auto piecewise_eval(const std::array<std::array<T, D>, N1> & polys, const std::array<T, N2> & bounds, T x)
{
auto it = std::upper_bound(std::cbegin(bounds), std::cend(bounds), x,
[](const T & lhs, const T & rhs){ return lhs < rhs; });
auto i = std::distance(std::cbegin(bounds), it);
return eval_horner(polys[i], x);
}
} // namespace polynomials
} // namespace grotto
#endif // LIBDPF_INCLUDE_GROTTO_PIECEWISE_HPP__