list.h

sky in game programming!

/*
 *  A generic template list class.  
 *  Fairly typical of the list example you would 
 *  find in any c++ book.
 */
#ifndef GENERIC_LIST_H
#define GENERIC_LIST_H

#include <assert.h>
#include <stdio.h>

template <class Type> class List {
	public:
				List(int s=0);
				~List();
		void	allocate(int s);
		void	SetSize(int s);
		void	Pack();
		void	Add(Type);
		void	AddUnique(Type);
		int 	Contains(Type);
		void	Remove(Type);
		void	DelIndex(int i);
		Type *	element;
		int		num;
		int		array_size;
		Type	&operator[](int i){assert(i>=0 && i<num); return element[i];}
};


template <class Type>
List<Type>::List(int s){
	num=0;
	array_size = 0;
	element = NULL;
	if(s) {
		allocate(s);
	}
}

template <class Type>
List<Type>::~List<Type>(){
	delete element;
}

template <class Type>
void List<Type>::allocate(int s){
	assert(s>0);
	assert(s>=num);
	Type *old = element;
	array_size =s;
	element = new Type[array_size];
	assert(element);
	for(int i=0;i<num;i++){
		element[i]=old[i];
	}
	if(old) delete old;
}
template <class Type>
void List<Type>::SetSize(int s){
	if(s==0) { if(element) delete element;}
	else {	allocate(s); }
	num=s;
}
template <class Type>
void List<Type>::Pack(){
	allocate(num);
}

template <class Type>
void List<Type>::Add(Type t){
	assert(num<=array_size);
	if(num==array_size) {
		allocate((array_size)?array_size *2:16);
	}
	//int i;
	//for(i=0;i<num;i++) {
		// dissallow duplicates
	//	assert(element[i] != t);
	//}
	element[num++] = t;
}

template <class Type>
int List<Type>::Contains(Type t){
	int i;
	int count=0;
	for(i=0;i<num;i++) {
		if(element[i] == t) count++;
	}
	return count;
}

template <class Type>
void List<Type>::AddUnique(Type t){
	if(!Contains(t)) Add(t);
}


template <class Type>
void List<Type>::DelIndex(int i){
	assert(i<num);
	num--;
	while(i<num){
		element[i] = element[i+1];
		i++;
	}
}

template <class Type>
void List<Type>::Remove(Type t){
	int i;
	for(i=0;i<num;i++) {
		if(element[i] == t) {
			break;
		}
	}
	DelIndex(i);
	for(i=0;i<num;i++) {
		assert(element[i] != t);
	}
}





#endif