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+/*
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+ * ZeroTier One - Network Virtualization Everywhere
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+ * Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ * --
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+ *
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+ * You can be released from the requirements of the license by purchasing
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+ * a commercial license. Buying such a license is mandatory as soon as you
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+ * develop commercial closed-source software that incorporates or links
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+ * directly against ZeroTier software without disclosing the source code
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+ * of your own application.
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+ */
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+
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+#include "Constants.hpp"
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+
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+namespace ZeroTier {
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+
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+/**
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+ * A really simple fixed capacity vector
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+ *
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+ * This class does no bounds checking, so the user must ensure that
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+ * no more than C elements are ever added and that accesses are in
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+ * bounds.
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+ *
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+ * @tparam T Type to contain
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+ * @tparam C Capacity of vector
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+ */
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+template<typename T,unsigned long C>
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+class FCV
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+{
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+public:
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+ FCV() : _s(0) {}
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+ ~FCV() { clear(); }
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+
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+ FCV(const FCV &v) :
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+ _s(v._s)
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+ {
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+ for(unsigned long i=0;i<_s;++i) {
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+ new (reinterpret_cast<T *>(_mem + (sizeof(T) * i))) T(reinterpret_cast<const T *>(v._mem)[i]);
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+ }
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+ }
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+
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+ inline FCV &operator=(const FCV &v)
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+ {
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+ clear();
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+ _s = v._s;
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+ for(unsigned long i=0;i<_s;++i) {
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+ new (reinterpret_cast<T *>(_mem + (sizeof(T) * i))) T(reinterpret_cast<const T *>(v._mem)[i]);
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+ }
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+ return *this;
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+ }
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+
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+ typedef T * iterator;
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+ typedef const T * const_iterator;
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+ typedef unsigned long size_type;
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+
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+ inline iterator begin() { return (T *)_mem; }
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+ inline iterator end() { return (T *)(_mem + (sizeof(T) * _s)); }
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+ inline iterator begin() const { return (const T *)_mem; }
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+ inline iterator end() const { return (const T *)(_mem + (sizeof(T) * _s)); }
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+
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+ inline T &operator[](const size_type i) { return reinterpret_cast<T *>(_mem)[i]; }
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+ inline const T &operator[](const size_type i) const { return reinterpret_cast<const T *>(_mem)[i]; }
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+
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+ inline T &front() { return reinterpret_cast<T *>(_mem)[0]; }
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+ inline const T &front() const { return reinterpret_cast<const T *>(_mem)[0]; }
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+ inline T &back() { return reinterpret_cast<T *>(_mem)[_s - 1]; }
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+ inline const T &back() const { return reinterpret_cast<const T *>(_mem)[_s - 1]; }
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+
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+ inline void push_back(const T &v) { new (reinterpret_cast<T *>(_mem + (sizeof(T) * _s++))) T(v); }
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+ inline void pop_back() { reinterpret_cast<T *>(_mem + (sizeof(T) * --_s))->~T(); }
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+
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+ inline size_type size() const { return _s; }
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+ inline size_type capacity() const { return C; }
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+
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+ inline void clear()
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+ {
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+ for(unsigned long i=0;i<_s;++i)
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+ reinterpret_cast<T *>(_mem + (sizeof(T) * i))->~T();
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+ _s = 0;
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+ }
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+
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+private:
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+ char _mem[sizeof(T) * C];
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+ unsigned long _s;
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+};
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+
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+} // namespace ZeroTier
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