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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2018  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * 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 3 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 <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * You can be released from the requirements of the license by purchasing
+ * a commercial license. Buying such a license is mandatory as soon as you
+ * develop commercial closed-source software that incorporates or links
+ * directly against ZeroTier software without disclosing the source code
+ * of your own application.
+ */
+
+#include "Constants.hpp"
+
+namespace ZeroTier {
+
+/**
+ * A really simple fixed capacity vector
+ *
+ * This class does no bounds checking, so the user must ensure that
+ * no more than C elements are ever added and that accesses are in
+ * bounds.
+ *
+ * @tparam T Type to contain
+ * @tparam C Capacity of vector
+ */
+template<typename T,unsigned long C>
+class FCV
+{
+public:
+	FCV() : _s(0) {}
+	~FCV() { clear(); }
+
+	FCV(const FCV &v) :
+		_s(v._s)
+	{
+		for(unsigned long i=0;i<_s;++i) {
+			new (reinterpret_cast<T *>(_mem + (sizeof(T) * i))) T(reinterpret_cast<const T *>(v._mem)[i]);
+		}
+	}
+
+	inline FCV &operator=(const FCV &v)
+	{
+		clear();
+		_s = v._s;
+		for(unsigned long i=0;i<_s;++i) {
+			new (reinterpret_cast<T *>(_mem + (sizeof(T) * i))) T(reinterpret_cast<const T *>(v._mem)[i]);
+		}
+		return *this;
+	}
+
+	typedef T * iterator;
+	typedef const T * const_iterator;
+	typedef unsigned long size_type;
+
+	inline iterator begin() { return (T *)_mem; }
+	inline iterator end() { return (T *)(_mem + (sizeof(T) * _s)); }
+	inline iterator begin() const { return (const T *)_mem; }
+	inline iterator end() const { return (const T *)(_mem + (sizeof(T) * _s)); }
+
+	inline T &operator[](const size_type i) { return reinterpret_cast<T *>(_mem)[i]; }
+	inline const T &operator[](const size_type i) const { return reinterpret_cast<const T *>(_mem)[i]; }
+
+	inline T &front() { return reinterpret_cast<T *>(_mem)[0]; }
+	inline const T &front() const { return reinterpret_cast<const T *>(_mem)[0]; }
+	inline T &back() { return reinterpret_cast<T *>(_mem)[_s - 1]; }
+	inline const T &back() const { return reinterpret_cast<const T *>(_mem)[_s - 1]; }
+
+	inline void push_back(const T &v) { new (reinterpret_cast<T *>(_mem + (sizeof(T) * _s++))) T(v); }
+	inline void pop_back() { reinterpret_cast<T *>(_mem + (sizeof(T) * --_s))->~T(); }
+
+	inline size_type size() const { return _s; }
+	inline size_type capacity() const { return C; }
+
+	inline void clear()
+	{
+		for(unsigned long i=0;i<_s;++i)
+			reinterpret_cast<T *>(_mem + (sizeof(T) * i))->~T();
+		_s = 0;
+	}
+
+private:
+	char _mem[sizeof(T) * C];
+	unsigned long _s;
+};
+
+} // namespace ZeroTier