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array.hh
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array.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef ARRAY_HH
#define ARRAY_HH
/* -------------------------------------------------------------------------- */
#include "logger.hh"
#include "tamaas.hh"
#include <memory>
#include <thrust/copy.h>
#include <thrust/fill.h>
#include <utility>
/* -------------------------------------------------------------------------- */
namespace tamaas {
/**
* @brief Generic storage class with wrapping capacities
*/
template <typename T>
class Array final {
public:
/// Default
Array() = default;
/// Empty array of given size
Array(UInt size) : Array() { this->resize(size); }
/// Copy constructor (deep)
Array(const Array& v) : Array() {
this->resize(v._size);
thrust::copy_n(v._data, v._size, this->_data);
}
/// Move constructor (transfers data ownership)
Array(Array&& v) noexcept : Array() {
_data = std::exchange(v._data, nullptr);
_size = std::exchange(v._size, 0);
_reserved = std::exchange(v._reserved, 0);
wrapped = std::exchange(v.wrapped, false);
}
/// Wrap array on data
Array(T* data, UInt size) : Array() { this->wrapMemory(data, size); }
/// Destructor
~Array() {
if (not wrapped)
_alloc.deallocate(_data, _reserved);
}
public:
/// Copy operator
Array& operator=(const Array& v) {
this->wrapped = false;
if (v.size() != this->size())
this->resize(v.size());
thrust::copy_n(v._data, _size, _data);
return *this;
}
/// Move operator
Array& operator=(Array&& v) noexcept {
if (this != &v) {
if (not wrapped)
_alloc.deallocate(_data, _reserved);
_data = std::exchange(v._data, nullptr);
_size = std::exchange(v._size, 0);
_reserved = std::exchange(v._reserved, 0);
wrapped = std::exchange(v.wrapped, false);
}
return *this;
}
void wrap(Array& other) { this->wrapMemory(other._data, other._size); }
void wrap(const Array& other) { this->wrapMemory(other._data, other._size); }
/// Wrap a memory pointer
void wrapMemory(T* data, UInt size) {
_data = data;
_size = size;
wrapped = true;
_reserved = 0;
}
/// Assign a sigle value to the array
void assign(UInt size, const T& value) {
this->resize(size);
thrust::fill(_data, _data + size, value);
}
void setWrapped(bool w) { wrapped = w; }
/// Data pointer access (const)
const T* data() const { return _data; }
/// Data pointer access (non-const)
T* data() { return _data; }
/// Data pointer setter
void setData(T* new_ptr) { _data = new_ptr; }
/// Resize array
void resize(UInt size) {
if (wrapped)
TAMAAS_EXCEPTION("cannot resize wrapped array");
// Erase array
if (size == 0) {
_alloc.deallocate(_data, _reserved);
_data = nullptr;
_size = 0;
_reserved = 0;
return;
}
// Do nothing
if (size == this->_size)
return;
// Allocate new data
_alloc.deallocate(_data, _reserved);
_data = _alloc.allocate(size);
_size = size;
_reserved = size;
}
/// Reserve storage space
void reserve(UInt size) {
if (_reserved >= size)
return;
auto new_data = _alloc.allocate(size);
if (new_data != _data) {
thrust::copy_n(_data, _size, new_data);
_alloc.deallocate(_data, _reserved);
_data = new_data;
_reserved = size;
}
}
/// Access operator
inline T& operator[](UInt i) {
TAMAAS_ASSERT(i < _size, "memory overflow");
return _data[i];
}
/// Access operator (const)
inline const T& operator[](UInt i) const {
TAMAAS_ASSERT(i < _size, "memory overflow");
return _data[i];
}
/// Get size of array
inline UInt size() const { return _size; }
private:
T* _data = nullptr;
UInt _size = 0;
std::size_t _reserved = 0;
bool wrapped = false;
Allocator<T> _alloc;
};
} // namespace tamaas
/* -------------------------------------------------------------------------- */
#endif /* ARRAY_HH */

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