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authoraap <aap@papnet.eu>2019-05-15 16:52:37 +0200
committeraap <aap@papnet.eu>2019-05-15 16:52:37 +0200
commit600bf0351476a5a21aabb5429132ddf7f52ac0b9 (patch)
treed8e48b3a581679e33830fb7c98ed69e1e242e2c2 /src/templates.h
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Diffstat (limited to 'src/templates.h')
-rw-r--r--src/templates.h179
1 files changed, 179 insertions, 0 deletions
diff --git a/src/templates.h b/src/templates.h
new file mode 100644
index 00000000..75bfd26b
--- /dev/null
+++ b/src/templates.h
@@ -0,0 +1,179 @@
+#pragma once
+
+template<typename T, int n>
+class CStore
+{
+public:
+ int allocPtr;
+ T store[n];
+
+ T *alloc(void){
+ if(this->allocPtr >= n)
+ printf("Size of this thing:%d needs increasing\n", n);
+ return &this->store[this->allocPtr++];
+ }
+ void clear(void){
+ this->allocPtr = 0;
+ }
+};
+
+template<typename T, typename U = T>
+class CPool
+{
+ U *m_entries;
+ union Flags {
+ struct {
+ uint8 id : 7;
+ uint8 free : 1;
+ };
+ uint8 u;
+ } *m_flags;
+ int m_size;
+ int m_allocPtr;
+
+public:
+ CPool(int size){
+ m_entries = (U*)malloc(sizeof(U)*size);
+ m_flags = (Flags*)malloc(sizeof(Flags)*size);
+ m_size = size;
+ m_allocPtr = 0;
+ for(int i = 0; i < size; i++){
+ m_flags[i].id = 0;
+ m_flags[i].free = 1;
+ }
+ }
+ int GetSize(void) { return m_size; }
+ T *New(void){
+ bool wrapped = false;
+ do
+ if(++m_allocPtr == m_size){
+ if(wrapped)
+ return nil;
+ wrapped = true;
+ m_allocPtr = 0;
+ }
+ while(!m_flags[m_allocPtr].free);
+ m_flags[m_allocPtr].free = 0;
+ m_flags[m_allocPtr].id++;
+ return (T*)&m_entries[m_allocPtr];
+ }
+ T *New(int handle){
+ T *entry = (T*)m_entries[handle>>8];
+ SetNotFreeAt(handle);
+ return entry;
+ }
+ void SetNotFreeAt(int handle){
+ int idx = handle>>8;
+ m_flags[idx].free = 0;
+ m_flags[idx].id = handle & 0x7F;
+ for(m_allocPtr = 0; m_allocPtr < m_size; m_allocPtr++)
+ if(m_flags[m_allocPtr].free)
+ return;
+ }
+ void Delete(T *entry){
+ int i = GetJustIndex(entry);
+ m_flags[i].free = 1;
+ if(i < m_allocPtr)
+ m_allocPtr = i;
+ }
+ T *GetSlot(int i){
+ return m_flags[i].free ? nil : (T*)&m_entries[i];
+ }
+ T *GetAt(int handle){
+ return m_flags[handle>>8].u == handle & 0xFF ?
+ (T*)&m_entries[handle>>8] : nil;
+ }
+ int GetIndex(T *entry){
+ int i = GetJustIndex(entry);
+ return m_flags[i].u + (i<<8);
+ }
+ int GetJustIndex(T *entry){
+ // TODO: the cast is unsafe
+ return (int)((U*)entry - m_entries);
+ }
+ int GetNoOfUsedSpaces(void){
+ int i;
+ int n = 0;
+ for(i = 0; i < m_size; i++)
+ if(!m_flags[i].free)
+ n++;
+ return n;
+ }
+};
+
+template<typename T>
+class CLink
+{
+public:
+ T item;
+ CLink<T> *prev;
+ CLink<T> *next;
+
+ void Insert(CLink<T> *link){
+ link->next = this->next;
+ this->next->prev = link;
+ link->prev = this;
+ this->next = link;
+ }
+ void Remove(void){
+ this->prev->next = this->next;
+ this->next->prev = this->prev;
+ }
+};
+
+template<typename T>
+class CLinkList
+{
+public:
+ CLink<T> head, tail;
+ CLink<T> freeHead, freeTail;
+ CLink<T> *links;
+
+ void Init(int n){
+ links = new CLink<T>[n];
+ head.next = &tail;
+ tail.prev = &head;
+ freeHead.next = &freeTail;
+ freeTail.prev = &freeHead;
+ while(n--)
+ freeHead.Insert(&links[n]);
+ }
+ // Shutdown
+ void Clear(void){
+ while(head.next != &tail)
+ Remove(head.next);
+ }
+ CLink<T> *Insert(T const &item){
+ CLink<T> *node = freeHead.next;
+ if(node == &freeTail)
+ return nil;
+ node->item = item;
+ node->Remove(); // remove from free list
+ head.Insert(node);
+ return node;
+ }
+ CLink<T> *InsertSorted(T const &item){
+ CLink<T> *sort;
+ for(sort = head.next; sort != &tail; sort = sort->next)
+ if(sort->item.sort >= item.sort)
+ break;
+ CLink<T> *node = freeHead.next;
+ if(node == &freeTail)
+ return nil;
+ node->item = item;
+ node->Remove(); // remove from free list
+ sort->prev->Insert(node);
+ return node;
+ }
+ void Remove(CLink<T> *link){
+ link->Remove(); // remove from list
+ freeHead.Insert(link); // insert into free list
+ }
+ int Count(void){
+ int n = 0;
+ CLink<T> *lnk;
+ for(lnk = head.next; lnk != &tail; lnk = lnk->next)
+ n++;
+ return n;
+ }
+};