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+/* GRAPHITE2 LICENSING
+
+ Copyright 2010, SIL International
+ All rights reserved.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of 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
+ Lesser General Public License for more details.
+
+ You should also have received a copy of the GNU Lesser General Public
+ License along with this library in the file named "LICENSE".
+ If not, write to the Free Software Foundation, 51 Franklin Street,
+ Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+ internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or 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.
+*/
+
+// designed to have a limited subset of the std::vector api
+#pragma once
+
+#include <cstddef>
+#include <cassert>
+#include <cstring>
+#include <cstdlib>
+#include <new>
+
+
+namespace graphite2 {
+
+template <typename T>
+inline
+ptrdiff_t distance(T* first, T* last) { return last-first; }
+
+
+template <typename T>
+class Vector
+{
+ T * m_first, *m_last, *m_end;
+public:
+ typedef T & reference;
+ typedef const T & const_reference;
+ typedef T * iterator;
+ typedef const T * const_iterator;
+
+ Vector() : m_first(0), m_last(0), m_end(0) {}
+ Vector(size_t n, const T& value = T()) : m_first(0), m_last(0), m_end(0) { insert(begin(), n, value); }
+ Vector(const Vector<T> &rhs) : m_first(0), m_last(0), m_end(0) { insert(begin(), rhs.begin(), rhs.end()); }
+ template <typename I>
+ Vector(I first, const I last) : m_first(0), m_last(0), m_end(0) { insert(begin(), first, last); }
+ ~Vector() { clear(); free(m_first); }
+
+ iterator begin() { return m_first; }
+ const_iterator begin() const { return m_first; }
+
+ iterator end() { return m_last; }
+ const_iterator end() const { return m_last; }
+
+ bool empty() const { return m_first == m_last; }
+ size_t size() const { return m_last - m_first; }
+ size_t capacity() const{ return m_end - m_first; }
+
+ void reserve(size_t n);
+ void resize(size_t n, const T & v = T());
+
+ reference front() { assert(size() > 0); return *begin(); }
+ const_reference front() const { assert(size() > 0); return *begin(); }
+ reference back() { assert(size() > 0); return *(end()-1); }
+ const_reference back() const { assert(size() > 0); return *(end()-1); }
+
+ Vector<T> & operator = (const Vector<T> & rhs) { assign(rhs.begin(), rhs.end()); return *this; }
+ reference operator [] (size_t n) { assert(size() > n); return m_first[n]; }
+ const_reference operator [] (size_t n) const { assert(size() > n); return m_first[n]; }
+
+ void assign(size_t n, const T& u) { clear(); insert(begin(), n, u); }
+ void assign(const_iterator first, const_iterator last) { clear(); insert(begin(), first, last); }
+ iterator insert(iterator p, const T & x) { p = _insert_default(p, 1); new (p) T(x); return p; }
+ void insert(iterator p, size_t n, const T & x);
+ void insert(iterator p, const_iterator first, const_iterator last);
+ void pop_back() { assert(size() > 0); --m_last; }
+ void push_back(const T &v) { if (m_last == m_end) reserve(size()+1); new (m_last++) T(v); }
+
+ void clear() { erase(begin(), end()); }
+ iterator erase(iterator p) { return erase(p, p+1); }
+ iterator erase(iterator first, iterator last);
+
+private:
+ iterator _insert_default(iterator p, size_t n);
+};
+
+template <typename T>
+inline
+void Vector<T>::reserve(size_t n)
+{
+ if (n > capacity())
+ {
+ const ptrdiff_t sz = size();
+ m_first = static_cast<T*>(realloc(m_first, n*sizeof(T)));
+ if (!m_first) std::abort();
+ m_last = m_first + sz;
+ m_end = m_first + n;
+ }
+}
+
+template <typename T>
+inline
+void Vector<T>::resize(size_t n, const T & v) {
+ const ptrdiff_t d = n-size();
+ if (d < 0) erase(end()+d, end());
+ else if (d > 0) insert(end(), d, v);
+}
+
+template<typename T>
+inline
+typename Vector<T>::iterator Vector<T>::_insert_default(iterator p, size_t n)
+{
+ assert(begin() <= p && p <= end());
+ const ptrdiff_t i = p - begin();
+ reserve(((size() + n + 7) >> 3) << 3);
+ p = begin() + i;
+ // Move tail if there is one
+ if (p != end()) memmove(p + n, p, distance(p,end())*sizeof(T));
+ m_last += n;
+ return p;
+}
+
+template<typename T>
+inline
+void Vector<T>::insert(iterator p, size_t n, const T & x)
+{
+ p = _insert_default(p, n);
+ // Copy in elements
+ for (; n; --n, ++p) { new (p) T(x); }
+}
+
+template<typename T>
+inline
+void Vector<T>::insert(iterator p, const_iterator first, const_iterator last)
+{
+ p = _insert_default(p, distance(first, last));
+ // Copy in elements
+ for (;first != last; ++first, ++p) { new (p) T(*first); }
+}
+
+template<typename T>
+inline
+typename Vector<T>::iterator Vector<T>::erase(iterator first, iterator last)
+{
+ for (iterator e = first; e != last; ++e) e->~T();
+ const size_t sz = distance(first, last);
+ if (m_last != last) memmove(first, last, distance(last,end())*sizeof(T));
+ m_last -= sz;
+ return first;
+}
+
+} // namespace graphite2