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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
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