first commit

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;
+	}
+};