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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
// dmnsn_array* wrapper.
#ifndef DIMENSIONXX_ARRAY_HPP
#define DIMENSIONXX_ARRAY_HPP
#include <tr1/memory> // For tr1::shared_ptr
#include <cstdlib> // For size_t
namespace Dimension
{
// Array template class, wraps a dmnsn_array*. Copying is possible, but
// copies refer to the same object, which is reference counted. T must be
// a POD type.
template <typename T>
class Array
{
public:
Array();
explicit Array(dmnsn_array* array);
// Array(const Array& a);
~Array()
{ if (m_array && m_array.unique()) { dmnsn_delete_array(dmnsn()); } }
// Array& operator=(const Array& a);
T& operator[](std::size_t i)
{ return *reinterpret_cast<T*>(dmnsn_array_at(dmnsn(), i)); }
const T& operator[](std::size_t i) const
{ return *reinterpret_cast<const T*>(dmnsn_array_at(dmnsn(), i)); }
std::size_t size() const { return dmnsn_array_size(dmnsn()); }
void resize(std::size_t size) { dmnsn_array_resize(dmnsn(), size); }
// Access the wrapped C object.
dmnsn_array* dmnsn();
const dmnsn_array* dmnsn() const;
// Release ownership of the dmnsn_array*, needed for returning a
// dmnsn_array* from a function.
dmnsn_array* release();
private:
std::tr1::shared_ptr<dmnsn_array*> m_array;
};
// A constraint enforcing that T is a POD type by making it part of a union.
// Taking the address of this function will cause a compile-time failure if
// T is not a POD type.
template <typename T>
void
POD_constraint()
{
union
{
T t;
} constraint;
static_cast<void>(constraint); // Silence unused variable warning
}
template <typename T>
Array<T>::Array()
: m_array(new dmnsn_array*(dmnsn_new_array(sizeof(T))))
{
void (*constraint)() = &POD_constraint<T>;
static_cast<void>(constraint); // Silence unused variable warning
}
template <typename T>
Array<T>::Array(dmnsn_array* array)
: m_array(new dmnsn_array*(array))
{
void (*constraint)() = &POD_constraint<T>;
static_cast<void>(constraint); // Silence unused variable warning
}
// Access the underlying dmnsn_array*
template <typename T>
dmnsn_array*
Array<T>::dmnsn()
{
if (!m_array) {
throw Dimension_Error("Attempting to access released array.");
}
return *m_array;
}
template <typename T>
const dmnsn_array*
Array<T>::dmnsn() const
{
if (!m_array) {
throw Dimension_Error("Attempting to access released array.");
}
return *m_array;
}
// Release the dmnsn_array*, if we are the only Array holding it
template <typename T>
dmnsn_array*
Array<T>::release()
{
dmnsn_array* array = dmnsn();
if (!m_array.unique()) {
throw Dimension_Error("Attempting to release non-unique array.");
} else {
m_array.reset();
return array;
}
}
}
#endif /* DIMENSIONXX_ARRAY_HPP */
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