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/*
Copyright(C) 2011-2016 Brazil
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 the License, or (at your option) any later version.
This 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "dat.hpp"
#include <new>
namespace grn {
namespace dat {
template <typename T>
class GRN_DAT_API Vector {
public:
Vector() : buf_(NULL), size_(0), capacity_(0) {}
~Vector() {
for (UInt32 i = 0; i < size(); ++i) {
buf_[i].~T();
}
delete [] reinterpret_cast<char *>(buf_);
}
const T &operator[](UInt32 i) const {
GRN_DAT_DEBUG_THROW_IF(i >= size());
return buf_[i];
}
T &operator[](UInt32 i) {
GRN_DAT_DEBUG_THROW_IF(i >= size());
return buf_[i];
}
const T &front() const {
GRN_DAT_DEBUG_THROW_IF(empty());
return buf_[0];
}
T &front() {
GRN_DAT_DEBUG_THROW_IF(empty());
return buf_[0];
}
const T &back() const {
GRN_DAT_DEBUG_THROW_IF(empty());
return buf_[size() - 1];
}
T &back() {
GRN_DAT_DEBUG_THROW_IF(empty());
return buf_[size() - 1];
}
const T *begin() const {
return buf_;
}
T *begin() {
return buf_;
}
const T *end() const {
return buf_ + size_;
}
T *end() {
return buf_ + size_;
}
void push_back() {
reserve(size() + 1);
new (&buf_[size()]) T;
++size_;
}
void push_back(const T &x) {
reserve(size() + 1);
new (&buf_[size()]) T(x);
++size_;
}
void pop_back() {
GRN_DAT_DEBUG_THROW_IF(empty());
back().~T();
--size_;
}
void clear() {
resize(0);
}
void resize(UInt32 new_size) {
if (new_size > capacity()) {
reserve(new_size);
}
for (UInt32 i = size(); i < new_size; ++i) {
new (&buf_[i]) T;
}
for (UInt32 i = new_size; i < size(); ++i) {
buf_[i].~T();
}
size_ = new_size;
}
template <typename U>
void resize(UInt32 new_size, const U &value) {
if (new_size > capacity()) {
reserve(new_size);
}
for (UInt32 i = size(); i < new_size; ++i) {
new (&buf_[i]) T(value);
}
for (UInt32 i = new_size; i < size(); ++i) {
buf_[i].~T();
}
size_ = new_size;
}
void reserve(UInt32 new_capacity) {
if (new_capacity <= capacity()) {
return;
} else if ((new_capacity / 2) < capacity()) {
if (capacity() < (MAX_UINT32 / 2)) {
new_capacity = capacity() * 2;
} else {
new_capacity = MAX_UINT32;
}
}
T *new_buf = reinterpret_cast<T *>(
new (std::nothrow) char[sizeof(new_capacity) * new_capacity]);
GRN_DAT_THROW_IF(MEMORY_ERROR, new_buf == NULL);
for (UInt32 i = 0; i < size(); ++i) {
new (&new_buf[i]) T(buf_[i]);
}
for (UInt32 i = 0; i < size(); ++i) {
buf_[i].~T();
}
T *old_buf = buf_;
buf_ = new_buf;
delete [] reinterpret_cast<char *>(old_buf);
capacity_ = new_capacity;
}
void swap(Vector *rhs) {
T * const temp_buf = buf_;
buf_ = rhs->buf_;
rhs->buf_ = temp_buf;
const UInt32 temp_size = size_;
size_ = rhs->size_;
rhs->size_ = temp_size;
const UInt32 temp_capacity = capacity_;
capacity_ = rhs->capacity_;
rhs->capacity_ = temp_capacity;
}
bool empty() const {
return size_ == 0;
}
UInt32 size() const {
return size_;
}
UInt32 capacity() const {
return capacity_;
}
private:
T *buf_;
UInt32 size_;
UInt32 capacity_;
// Disallows copy and assignment.
Vector(const Vector &);
Vector &operator=(const Vector &);
};
} // namespace dat
} // namespace grn
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