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Fixes and comments in FixedOrderedMultimap

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This commit is contained in:
Steffen Gaisser 2020-10-01 13:30:28 +02:00
parent 1f994d9933
commit 1f3a10b375
1 changed files with 159 additions and 49 deletions
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206
container/FixedOrderedMultimap.h
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@ -5,6 +5,24 @@
#include <cstring>
#include <set>
/**
* @brief A "Map" which allows multiple entries of the same key.
* @details
* Same keys are ordered by KEY_COMPARE function which is std::less<key_t> > by default.
*
* It uses the ArrayList, so technically this is not a real map, it is an array of pairs
* of type key_t, T. It is ordered by key_t as FixedMap but allows same keys.
*
* Its of fixed size so no allocations are performed after the construction.
*
* The maximum size is given as first parameter of the constructor.
*
* It provides an iterator to do list iterations.
*
* The type T must have a copy constructor if it is not trivial copy-able.
*
* @warning Iterators return a non-const key_t in the pair.
* @warning A User is not allowed to change the key, otherwise the map is corrupted.
*
* \ingroup container
*/
template<typename key_t, typename T, typename KEY_COMPARE = std::less<key_t>>
@ -14,78 +32,84 @@ public:
static const ReturnValue_t MAP_FULL = MAKE_RETURN_CODE(0x01);
static const ReturnValue_t KEY_DOES_NOT_EXIST = MAKE_RETURN_CODE(0x02);
private:
typedef KEY_COMPARE compare;
compare myComp;
ArrayList<std::pair<key_t, T>, uint32_t> theMap;
uint32_t _size;
uint32_t findFirstIndex(key_t key, uint32_t startAt = 0) const {
if (startAt >= _size) {
return startAt + 1;
}
uint32_t i = startAt;
for (i = startAt; i < _size; ++i) {
if (theMap[i].first == key) {
return i;
}
}
return i;
}
uint32_t findNicePlace(key_t key) const {
uint32_t i = 0;
for (i = 0; i < _size; ++i) {
if (myComp(key, theMap[i].first)) {
return i;
}
}
return i;
}
void removeFromPosition(uint32_t position) {
if (_size <= position) {
return;
}
memmove(static_cast<void*>(&theMap[position]), static_cast<void*>(&theMap[position + 1]),
(_size - position - 1) * sizeof(std::pair<key_t,T>));
--_size;
}
public:
FixedOrderedMultimap(uint32_t maxSize) :
/***
* Constructor which needs a size_t for the maximum allowed size
*
* Can not be resized during runtime
*
* Allocates memory at construction
* @param maxSize size_t of Maximum allowed size
*/
FixedOrderedMultimap(size_t maxSize) :
theMap(maxSize), _size(0) {
}
/***
* Virtual destructor frees Memory by deleting its member
*/
virtual ~FixedOrderedMultimap() {
}
class Iterator: public ArrayList<std::pair<key_t, T>, uint32_t>::Iterator {
/***
* Special iterator for FixedOrderedMultimap
*/
class Iterator: public ArrayList<std::pair<key_t, T>, size_t>::Iterator {
public:
Iterator() :
ArrayList<std::pair<key_t, T>, uint32_t>::Iterator() {
ArrayList<std::pair<key_t, T>, size_t>::Iterator() {
}
Iterator(std::pair<key_t, T> *pair) :
ArrayList<std::pair<key_t, T>, uint32_t>::Iterator(pair) {
ArrayList<std::pair<key_t, T>, size_t>::Iterator(pair) {
}
};
friend bool operator==(const typename FixedOrderedMultimap::Iterator& lhs,
const typename FixedOrderedMultimap::Iterator& rhs) {
return (lhs.value == rhs.value);
}
friend bool operator!=(const typename FixedOrderedMultimap::Iterator& lhs,
const typename FixedOrderedMultimap::Iterator& rhs) {
return not (lhs.value == rhs.value);
}
/***
* Returns an iterator on the first element
* @return Iterator pointing to first element
*/
Iterator begin() const {
return Iterator(&theMap[0]);
}
/**
* Returns an iterator pointing to one element past the end
* @return Iterator pointing to one element past the end
*/
Iterator end() const {
return Iterator(&theMap[_size]);
}
uint32_t size() const {
/***
* Returns the current size of the map (not maximum size!)
* @return Current size
*/
size_t size() const {
return _size;
}
/***
* Used to insert a key and value separately.
*
* @param[in] key Key of the new element
* @param[in] value Value of the new element
* @param[in/out] (optional) storedValue On success this points to the new value, otherwise a nullptr
* @return RETURN_OK if insert was successful, MAP_FULL if no space is available
*/
ReturnValue_t insert(key_t key, T value, Iterator *storedValue = nullptr) {
if (_size == theMap.maxSize()) {
return MAP_FULL;
}
uint32_t position = findNicePlace(key);
size_t position = findNicePlace(key);
memmove(static_cast<void*>(&theMap[position + 1]),static_cast<void*>(&theMap[position]),
(_size - position) * sizeof(std::pair<key_t,T>));
theMap[position].first = key;
@ -97,10 +121,21 @@ public:
return HasReturnvaluesIF::RETURN_OK;
}
/***
* Used to insert new pair instead of single values
*
* @param pair Pair to be inserted
* @return RETURN_OK if insert was successful, MAP_FULL if no space is available
*/
ReturnValue_t insert(std::pair<key_t, T> pair) {
return insert(pair.first, pair.second);
}
/***
* Can be used to check if a certain key is in the map
* @param key Key to be checked
* @return RETURN_OK if the key exists KEY_DOES_NOT_EXIST otherwise
*/
ReturnValue_t exists(key_t key) const {
ReturnValue_t result = KEY_DOES_NOT_EXIST;
if (findFirstIndex(key) < _size) {
@ -109,8 +144,18 @@ public:
return result;
}
/***
* Used to delete the element in the iterator
*
* The iterator will point to the element before or begin(),
* but never to one element in front of the map.
*
* @warning The iterator needs to be valid and dereferenceable
* @param[in/out] iter Pointer to iterator to the element that needs to be ereased
* @return RETURN_OK if erased, KEY_DOES_NOT_EXIST if the there is no element like this
*/
ReturnValue_t erase(Iterator *iter) {
uint32_t i;
size_t i;
if ((i = findFirstIndex((*iter).value->first)) >= _size) {
return KEY_DOES_NOT_EXIST;
}
@ -123,8 +168,13 @@ public:
return HasReturnvaluesIF::RETURN_OK;
}
/***
* Used to erase by key
* @param key Key to be erased
* @return RETURN_OK if erased, KEY_DOES_NOT_EXIST if the there is no element like this
*/
ReturnValue_t erase(key_t key) {
uint32_t i;
size_t i;
if ((i = findFirstIndex(key)) >= _size) {
return KEY_DOES_NOT_EXIST;
}
@ -135,6 +185,14 @@ public:
return HasReturnvaluesIF::RETURN_OK;
}
/***
* Find returns the first appearance of the key
*
* If the key does not exist, it points to end()
*
* @param key Key to search for
* @return Iterator pointing to the first entry of key
*/
Iterator find(key_t key) const {
ReturnValue_t result = exists(key);
if (result != HasReturnvaluesIF::RETURN_OK) {
@ -143,6 +201,15 @@ public:
return Iterator(&theMap[findFirstIndex(key)]);
}
/***
* Finds first entry of the given key and returns a
* pointer to the value
*
* @param key Key to search for
* @param value Found value
* @return RETURN_OK if it points to the value,
* KEY_DOES_NOT_EXIST if the key is not in the map
*/
ReturnValue_t find(key_t key, T **value) const {
ReturnValue_t result = exists(key);
if (result != HasReturnvaluesIF::RETURN_OK) {
@ -151,15 +218,58 @@ public:
*value = &theMap[findFirstIndex(key)].second;
return HasReturnvaluesIF::RETURN_OK;
}
/**
* Clears the map, does not deallocate any memory
*/
void clear() {
_size = 0;
}
uint32_t maxSize() const {
/**
* Returns the maximum size of the map
* @return Maximum size of the map
*/
size_t maxSize() const {
return theMap.maxSize();
}
private:
typedef KEY_COMPARE compare;
compare myComp;
ArrayList<std::pair<key_t, T>, size_t> theMap;
size_t _size;
size_t findFirstIndex(key_t key, size_t startAt = 0) const {
if (startAt >= _size) {
return startAt + 1;
}
size_t i = startAt;
for (i = startAt; i < _size; ++i) {
if (theMap[i].first == key) {
return i;
}
}
return i;
}
size_t findNicePlace(key_t key) const {
size_t i = 0;
for (i = 0; i < _size; ++i) {
if (myComp(key, theMap[i].first)) {
return i;
}
}
return i;
}
void removeFromPosition(size_t position) {
if (_size <= position) {
return;
}
memmove(static_cast<void*>(&theMap[position]), static_cast<void*>(&theMap[position + 1]),
(_size - position - 1) * sizeof(std::pair<key_t,T>));
--_size;
}
};
#endif /* FRAMEWORK_CONTAINER_FIXEDORDEREDMULTIMAP_H_ */