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DynArray.h
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1998-08-01
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// $Id: DynArray.h,v 1.9 1998/08/01 13:13:42 zeller Exp $ -*- C++ -*-
// Dynamic array -- generates the referenced entries
// Copyright (C) 1995 Technische Universitaet Braunschweig, Germany.
// Written by Andreas Zeller <zeller@ips.cs.tu-bs.de>.
//
// This file is part of the ICE Library.
//
// The ICE Library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// The ICE Library 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 Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with the ICE Library -- see the file COPYING.LIB.
// If not, write to the Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// ICE is the incremental configuration environment.
// For details, see the ICE World-Wide-Web page,
// `http://www.cs.tu-bs.de/softech/ice/',
// or send a mail to the ICE developers <ice@ips.cs.tu-bs.de>.
#ifndef _ICE_DynArray_h
#define _ICE_DynArray_h
#if defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 5)
#pragma interface
#endif
#include "assert.h"
#include "bool.h"
// A DynArray acts like an ordinary array,
// but it automatically expands to hold the referenced entry.
// Thus, if you say DynArray<int> d; d[100] = 10,
// it automatically expands to 100 elements.
// Note that a const DynArray will not grow.
// If you prefer sparse storage, see the Assoc template.
template<class T>
class DynArray {
private:
int _allocated_size; // size of _values
T *_values; // values
static int max(int a, int b) { return (a > b) ? a : b; }
// Grow by half the current size, at least to new_size_min
void grow(int new_size_min = 0)
{
int new_size = max(_allocated_size + _allocated_size / 2 + 1,
new_size_min);
T *new_values = new T [new_size];
for (int i = 0; i < _allocated_size; i++)
new_values[i] = _values[i];
delete[] _values;
_values = new_values;
_allocated_size = new_size;
}
protected:
T& value(int i)
{
assert(i >= 0);
if (i >= _allocated_size)
grow(i + 1);
return _values[i];
}
T& _value(int i) const
{
assert(i >= 0 && i < size());
return _values[i];
}
public:
// Resources
virtual int size() const { return _allocated_size; }
T& operator[](int i) const { return _value(i); }
T& operator[](int i) { return value(i); }
T* values() const { return _values; }
operator const T*() const { return values(); }
operator T*() const { return values(); }
// Constructors
DynArray(int initial_size = 0):
_allocated_size(initial_size),
_values(new T [initial_size])
{}
DynArray(T *v, int n):
_allocated_size(n),
_values(new T [n])
{
for (int i = 0; i < n; i++)
_values[i] = v[i];
}
// Copy constructor
DynArray(const DynArray<T>& m):
_allocated_size(m.size()),
_values(new T [m.size()])
{
for (int i = 0; i < _allocated_size; i++)
_values[i] = m._values[i];
}
// Destructor
virtual ~DynArray()
{
delete[] _values;
}
// Assignment
DynArray<T>& operator = (const DynArray<T>& m)
{
// Make sure self-assignment A = A works
if (this != &m)
{
T *old_values = _values;
_allocated_size = m.size();
_values = new T [_allocated_size];
for (int i = 0; i < m.size(); i++)
_values[i] = m._values[i];
delete[] old_values;
}
return *this;
}
// Comparison
bool operator == (const DynArray<T>& m)
{
if (this == &m)
return true; // THIS == THIS
if (size() != m.size())
return false;
for (int i = size() - 1; i >= 0; i--)
{
if (!(_values[i] == m._values[i]))
return false;
}
return true;
}
bool operator != (const DynArray<T>& m)
{
return !(operator == (m));
}
};
#endif // _ICE_DynArray_h
// DON'T ADD ANYTHING BEHIND THIS #endif