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+/**
+ * Copyright (c) 2007-2012, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file strong_int.hh
+ */
+
+#ifndef strong_int_hh
+#define strong_int_hh
+
+/**
+ * Template class for "strongly-typed" integers, in other words, integers that
+ * have different semantic meaning and cannot be easily used in place of one
+ * another.
+ *
+ * @param T The integer type.
+ * @param DISTINCT An class used solely to distinguish templates that have the
+ * same integer type.
+ */
+template<typename T, class DISTINCT>
+class strong_int {
+public:
+    explicit constexpr strong_int(T v = 0) noexcept : value(v){};
+    operator const T&() const
+    {
+        return this->value;
+    };
+    strong_int operator+(const strong_int& rhs) const
+    {
+        return strong_int(this->value + rhs.value);
+    };
+    strong_int operator-(const strong_int& rhs) const
+    {
+        return strong_int(this->value - rhs.value);
+    };
+    strong_int operator/(const strong_int& rhs) const
+    {
+        return strong_int(this->value / rhs.value);
+    };
+    bool operator<(const strong_int& rhs) const
+    {
+        return this->value < rhs.value;
+    };
+    strong_int& operator+=(const strong_int& rhs)
+    {
+        this->value += rhs.value;
+        return *this;
+    };
+    strong_int& operator-=(const strong_int& rhs)
+    {
+        this->value -= rhs.value;
+        return *this;
+    };
+    strong_int& operator-()
+    {
+        this->value = -this->value;
+        return *this;
+    };
+    strong_int& operator++()
+    {
+        this->value++;
+        return *this;
+    };
+    strong_int& operator--()
+    {
+        this->value--;
+        return *this;
+    };
+    bool operator==(const strong_int& rhs) const
+    {
+        return this->value == rhs.value;
+    };
+    T* out()
+    {
+        return &this->value;
+    };
+
+private:
+    T value;
+};
+
+/**
+ * Macro that declares a strongly-typed integer and the empty class used as a
+ * distinguisher.
+ *
+ * @param T The integer type.
+ * @param name The name of the strongly-typed integer.
+ */
+#define STRONG_INT_TYPE(T, name) \
+    class __##name##_distinct; \
+    typedef strong_int<T, __##name##_distinct> name##_t
+#endif