fsfw/container/ArrayList.h

254 lines
5.8 KiB
C++

#ifndef FSFW_CONTAINER_ARRAYLIST_H_
#define FSFW_CONTAINER_ARRAYLIST_H_
#include "../returnvalues/HasReturnvaluesIF.h"
#include "../serialize/SerializeAdapter.h"
#include "../serialize/SerializeIF.h"
/**
* @brief A List that stores its values in an array.
* @details
* The underlying storage is an array that can be allocated by the class
* itself or supplied via ctor.
*
* @ingroup container
*/
template<typename T, typename count_t = uint8_t>
class ArrayList {
template<typename U, typename count> friend class SerialArrayListAdapter;
public:
static const uint8_t INTERFACE_ID = CLASS_ID::ARRAY_LIST;
static const ReturnValue_t FULL = MAKE_RETURN_CODE(0x01);
/**
* This is the allocating constructor.
* It allocates an array of the specified size.
* @param maxSize
*/
ArrayList(count_t maxSize) :
size(0), maxSize_(maxSize), allocated(true) {
entries = new T[maxSize];
}
/**
* This is the non-allocating constructor
*
* It expects a pointer to an array of a certain size and initializes
* itself to it.
*
* @param storage the array to use as backend
* @param maxSize size of storage
* @param size size of data already present in storage
*/
ArrayList(T *storage, count_t maxSize, count_t size = 0) :
size(size), entries(storage), maxSize_(maxSize), allocated(false) {
}
/**
* Copying is forbiden by declaring copy ctor and copy assignment deleted
* It is too ambigous in this case.
* (Allocate a new backend? Use the same? What to do in an modifying call?)
*/
ArrayList(const ArrayList& other) = delete;
const ArrayList& operator=(const ArrayList& other) = delete;
/**
* Number of Elements stored in this List
*/
count_t size;
/**
* Destructor, if the allocating constructor was used, it deletes the array.
*/
virtual ~ArrayList() {
if (allocated) {
delete[] entries;
}
}
/**
* An Iterator to go trough an ArrayList
*
* It stores a pointer to an element and increments the
* pointer when incremented itself.
*/
class Iterator {
public:
/**
* Empty ctor, points to NULL
*/
Iterator(): value(0) {}
/**
* Initializes the Iterator to point to an element
*
* @param initialize
*/
Iterator(T *initialize) {
value = initialize;
}
/**
* The current element the iterator points to
*/
T *value;
Iterator& operator++() {
value++;
return *this;
}
Iterator operator++(int) {
Iterator tmp(*this);
operator++();
return tmp;
}
Iterator& operator--() {
value--;
return *this;
}
Iterator operator--(int) {
Iterator tmp(*this);
operator--();
return tmp;
}
T& operator*() {
return *value;
}
const T& operator*() const {
return *value;
}
T *operator->() {
return value;
}
const T *operator->() const {
return value;
}
};
friend bool operator==(const ArrayList::Iterator& lhs,
const ArrayList::Iterator& rhs) {
return (lhs.value == rhs.value);
}
friend bool operator!=(const ArrayList::Iterator& lhs,
const ArrayList::Iterator& rhs) {
return not (lhs.value == rhs.value);
}
/**
* Iterator pointing to the first stored elmement
*
* @return Iterator to the first element
*/
Iterator begin() const {
return Iterator(&entries[0]);
}
/**
* returns an Iterator pointing to the element after the last stored entry
*
* @return Iterator to the element after the last entry
*/
Iterator end() const {
return Iterator(&entries[size]);
}
T & operator[](count_t i) const {
return entries[i];
}
/**
* The first element
*
* @return pointer to the first stored element
*/
T *front() {
return entries;
}
/**
* The last element
*
* does not return a valid pointer if called on an empty list.
*
* @return pointer to the last stored element
*/
T *back() {
return &entries[size - 1];
//Alternative solution
//return const_cast<T*>(static_cast<const T*>(*this).back());
}
const T* back() const{
return &entries[size-1];
}
/**
* The maximum number of elements this List can contain
*
* @return maximum number of elements
*/
size_t maxSize() const {
return this->maxSize_;
}
/**
* Insert a new element into the list.
*
* The new element is inserted after the last stored element.
*
* @param entry
* @return
* -@c FULL if the List is full
* -@c RETURN_OK else
*/
ReturnValue_t insert(T entry) {
if (size >= maxSize_) {
return FULL;
}
entries[size] = entry;
++size;
return HasReturnvaluesIF::RETURN_OK;
}
/**
* clear the List
*
* This does not actually clear all entries, it only sets the size to 0.
*/
void clear() {
size = 0;
}
count_t remaining() {
return (maxSize_ - size);
}
protected:
/**
* pointer to the array in which the entries are stored
*/
T *entries;
/**
* remembering the maximum size
*/
size_t maxSize_;
/**
* true if the array was allocated and needs to be deleted in the destructor.
*/
bool allocated;
};
#endif /* FSFW_CONTAINER_ARRAYLIST_H_ */