From fa3d8f677b6a30c2115e7d167d4938e293dfad81 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 19 Aug 2018 16:27:07 +0200
Subject: Add StaticBitVec type

---
 chilbert/Hilbert.ipp      |   8 ++++
 chilbert/StaticBitVec.hpp | 112 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 chilbert/StaticBitVec.hpp

(limited to 'chilbert')

diff --git a/chilbert/Hilbert.ipp b/chilbert/Hilbert.ipp
index 9d23271..726b204 100644
--- a/chilbert/Hilbert.ipp
+++ b/chilbert/Hilbert.ipp
@@ -27,6 +27,7 @@
 #include "chilbert/Hilbert.hpp"
 #include "chilbert/SetBits.hpp"
 #include "chilbert/SetLocation.hpp"
+#include "chilbert/StaticBitVec.hpp"
 
 #include <cassert>
 
@@ -72,6 +73,13 @@ num_bits(const T& vec,
 	return vec.size();
 }
 
+template <size_t N>
+size_t
+num_bits(const StaticBitVec<N>&, void* = nullptr)
+{
+	return N;
+}
+
 // 'Transforms' a point.
 template <class I>
 inline void
diff --git a/chilbert/StaticBitVec.hpp b/chilbert/StaticBitVec.hpp
new file mode 100644
index 0000000..1501746
--- /dev/null
+++ b/chilbert/StaticBitVec.hpp
@@ -0,0 +1,112 @@
+/*
+  Copyright (C) 2018 David Robillard <d@drobilla.net>
+  Copyright (C) 2006-2007 Chris Hamilton <chamilton@cs.dal.ca>
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 2 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+  details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef CHILBERT_STATICBITVEC_HPP
+#define CHILBERT_STATICBITVEC_HPP
+
+#include "chilbert/BitVecIndex.hpp"
+#include "chilbert/BitVecIterator.hpp"
+#include "chilbert/BitVecMask.hpp"
+#include "chilbert/MultiBitVec.hpp"
+#include "chilbert/Operations.hpp"
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <climits>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+
+namespace chilbert {
+
+template <size_t N>
+class StaticBitVec : public MultiBitVec<StaticBitVec<N>>
+{
+public:
+	using Rack = typename MultiBitVec<StaticBitVec<N>>::Rack;
+
+	using MultiBitVec<StaticBitVec<N>>::bits_per_rack;
+
+	StaticBitVec() = default;
+
+	/// Constructor for compatibility with CBigBitVec
+	explicit StaticBitVec(const size_t bits)
+	{
+		assert(bits == size());
+	}
+
+	/// Constructor for compatibility with CBigBitVec
+	StaticBitVec(const size_t bits, const Rack value)
+	  : StaticBitVec{bits}
+	{
+		m_racks[0] = value;
+	}
+
+	/// Return the size in bits
+	size_t size() const { return N; }
+
+	/// Return a reference to the `index`th rack
+#ifndef NDEBUG
+	const auto& rack(const size_t index) const { return m_racks.at(index); }
+	auto&       rack(const size_t index) { return m_racks.at(index); }
+#else
+	const auto& rack(const size_t index) const { return m_racks[index]; }
+	auto&       rack(const size_t index) { return m_racks[index]; }
+#endif
+
+	/// Return a raw pointer to the racks
+	Rack*       data() { return m_racks.data(); }
+	const Rack* data() const { return m_racks.data(); }
+
+	/// Return the total size of all racks in bytes
+	static constexpr size_t data_size() { return num_racks() * sizeof(Rack); }
+
+	/// Return the number of racks
+	static constexpr size_t num_racks()
+	{
+		return (std::max(N, size_t(1)) + bits_per_rack - 1) / bits_per_rack;
+	}
+
+private:
+	std::array<Rack, num_racks()> m_racks{};
+};
+
+template <size_t N>
+struct is_bitvec<StaticBitVec<N>>
+{
+	constexpr static bool value = true;
+};
+
+template <size_t N>
+void
+grayCode(StaticBitVec<N>& value)
+{
+	grayCode(static_cast<MultiBitVec<StaticBitVec<N>>&>(value));
+}
+
+template <size_t N>
+void
+grayCodeInv(StaticBitVec<N>& value)
+{
+	grayCodeInv(static_cast<MultiBitVec<StaticBitVec<N>>&>(value));
+}
+
+} // namespace chilbert
+
+#endif
-- 
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