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#ifndef ANDROID_RENDERSCRIPT_LIST_H
#define ANDROID_RENDERSCRIPT_LIST_H
namespace android {
namespace renderscript {
namespace {
constexpr size_t BUFFER_SIZE = 64;
} // anonymous namespace
template <class T>
class List {
private:
class LinkedBuffer {
public:
LinkedBuffer() : next(nullptr) {}
union {
char raw[BUFFER_SIZE - sizeof(LinkedBuffer*)];
T typed;
} data;
LinkedBuffer* next;
};
public:
class iterator;
List() : last(nullptr), first(&firstBuffer.data.typed),
beginIterator(this, &firstBuffer, const_cast<T*>(first)),
_size(0) {
current = const_cast<T*>(first);
currentBuffer = &firstBuffer;
}
template <class InputIterator>
List(InputIterator first, InputIterator last) : List() {
for (InputIterator it = first; it != last; ++it) {
push_back(*it);
}
}
~List() {
LinkedBuffer* p = firstBuffer.next;
LinkedBuffer* next;
while (p != nullptr) {
next = p->next;
delete p;
p = next;
}
}
void push_back(const T& value) {
last = current;
*current++ = value;
_size++;
if ((void*)current >= (void*)¤tBuffer->next) {
LinkedBuffer* newBuffer = new LinkedBuffer();
currentBuffer->next = newBuffer;
currentBuffer = newBuffer;
current = ¤tBuffer->data.typed;
}
}
class iterator {
friend class List;
public:
iterator& operator++() {
p++;
if ((void*)p >= (void*)&buffer->next) {
buffer = buffer->next;
if (buffer != nullptr) {
p = &buffer->data.typed;
} else {
p = nullptr;
}
}
return *this;
}
bool operator==(const iterator& other) const {
return p == other.p && buffer == other.buffer && list == other.list;
}
bool operator!=(const iterator& other) const {
return p != other.p || buffer != other.buffer || list != other.list;
}
const T& operator*() const { return *p; }
T* operator->() { return p; }
protected:
iterator(const List* list_) : list(list_) {}
iterator(const List* list_, LinkedBuffer* buffer_, T* p_) :
p(p_), buffer(buffer_), list(list_) {}
private:
T* p;
LinkedBuffer* buffer;
const List* list;
};
const iterator& begin() const { return beginIterator; }
iterator end() const { return iterator(this, currentBuffer, current); }
bool empty() const { return current == first; }
T& front() const { return *const_cast<T*>(first); }
T& back() const { return *last; }
size_t size() const { return _size; }
private:
T* current;
T* last;
LinkedBuffer* currentBuffer;
LinkedBuffer firstBuffer;
const T* first;
const iterator beginIterator;
size_t _size;
};
} // namespace renderscript
} // namespace android
#endif // ANDROID_RENDERSCRIPT_LIST_H
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