Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/grotto/gadgets/elementary/nonnegative.hpp

@@ -0,0 +1,26 @@
+/// @file grotto/gadgets/elementary/nonnegative.hpp
+/// @author Ryan Henry <ryan.henry@ucalgary.ca>
+/// @brief
+/// @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_GADGETS_ELEMENTARY_NONNEGATIVE_HPP__
+#define LIBDPF_INCLUDE_GROTTO_GADGETS_ELEMENTARY_NONNEGATIVE_HPP__
+
+#include "geq.hpp"
+
+namespace grotto
+{
+
+namespace gadgets
+{
+
+static constexpr double geq_target_zero = 0;
+using nonnegative = geq<geq_target_zero>;
+
+}  // namespace gadgets
+
+}  // namespace grotto
+
+#endif  // LIBDPF_INCLUDE_GROTTO_GADGETS_ELEMENTARY_NONNEGATIVE_HPP__