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diff --git a/Hilbert/Operations.hpp b/Hilbert/Operations.hpp
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+++ b/Hilbert/Operations.hpp
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+/*
+ * Copyright (C) 2018 David Robillard <d@drobilla.net>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _OPERATIONS_HPP_
+#define _OPERATIONS_HPP_
+
+#include <cassert>
+#include <climits>
+#include <cstddef>
+#include <type_traits>
+
+/// IntegralIndex<T> only exists if T is integral
+template <typename T>
+using IntegralIndex = std::enable_if_t<std::is_integral<T>::value, int>;
+
+/// BitsetIndex<T> only exists if T is not integral (must be a bitset)
+template <typename T>
+using BitsetIndex = std::enable_if_t<!std::is_integral<T>::value, int>;
+
+/// Return the `index`th bit in `field`
+template <typename T>
+bool
+testBit(const T& field, const IntegralIndex<T> index)
+{
+	assert(size_t(index) < sizeof(field) * CHAR_BIT);
+	return field & (((T)1) << index);
+}
+
+/// Return the `index`th bit in `field`
+template <typename T>
+bool
+testBit(const T& field, const BitsetIndex<T> index)
+{
+	return field.test(index);
+}
+
+/// Set the `index`th bit in `field` to `value`
+template <typename T>
+void
+setBit(T& field, const IntegralIndex<T> index, const bool value)
+{
+	assert(size_t(index) < sizeof(field) * CHAR_BIT);
+	field ^= (-value ^ field) & ((T)1 << index);
+	assert(testBit(field, index) == value);
+}
+
+/// Set the `index`th bit in `field` to `value`
+template <typename T>
+void
+setBit(T& field, const BitsetIndex<T> index, const bool value)
+{
+	field.set(index, value);
+}
+
+#endif