当C++遇到IOS应用开发之---List集合

在Object-c中，数组使用NSArray和NSMutableArray(可变长数组)。使用语法如下：
[cpp]
NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];

取数组元素的方法:
[html]
[array objectAtIndex:2]);

因为数组在开发中会被频繁使用，且objectAtIndex的写法看着过于繁复，远不如array[2]这种直观。所以我将C++中的vector类进行了封装，并增加一些新的功能：www.zzzyk.com

[cpp]
#include <iostream>
#include <vector>

using namespace std;
using namespace std::tr1;
template<typename T, typename _Alloc = std::allocator<T> >
class List: public vector<T, _Alloc>
{
private:
    typedef typename std::vector<T>::iterator list_it;

    list_it _it;

public:
    List(){}

    List(NSArray *array){
        copyFromArray(array);
    }


    List(string *array){
        copyFromArray(array);
    }

    List(int *array){
        copyFromArray(array);
    }

    ~List()
    {
        std::cout<<"list destroy!"<<endl;
    }

    List& add(const T t){
        this->push_back(t);
        return (*this);
    }

    void clear(){
        //this->clear();
        this->erase(this->begin(), this->end());
    }


    BOOL contains(const T t){
        return indexOf(t) >= 0;
    }


    int indexOf(const T t){
        list_it it = std::find(this->begin(),this->end() , t ) ;
        if(it != this->end())
            return it - this->begin();
        return -1 ;
    }

    void insert(int index, const T t)
    {
        this->insert(this.begin() + index, 1, t);
    }


    void remove(const T t)
    {
        int pos = indexOf(t);
        if (pos >= 0)
            this->removeAt(pos);
    }

    void removeAt(int index)
    {
        if (this->size() > index){
            this->erase(this->begin() + index, this->begin() + index + 1);
        }
    }

    int count()
    {
        return this->size();
    }

    void copyFrom(List<T> list)
    {
         this->assign(list.begin(), list.end());
    }

    void copyFromArray(NSArray *array){
         for(int i = 0; i< [array count]; i++){
             T t = (T)[array objectAtIndex:i];
             this->push_back(t);
         }
    }

    void copyFromArray(string* array){
        for(int i = 0; i< array->length(); i++){
            T t = (T)array[i];
            this->push_back(t);
        }
    }

    void copyFromArray(int* array){
        for(int i = 0; i<(sizeof(array)/sizeof(int)); i++){
            T t = (T)array[i];
            this->push_back(t);
            //this->vector<T>::push_back(new T);//usage:用父类方法或 static_cast<vector<T>*>(this)->push_back(T);
        }
    }
};

用法如下

实例化对象并添加数据：
[cpp]
List<NSString*> list;
list.add(@"1");
list.add(@"2代震军");
list.add(@"333").add(@"44444").add(@"5");

或用下面方式：
[cpp]
NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
List<NSString*> list1(array);

判断是否存在某数据：
[cpp]
NSString *del = @"44444";
bool iscontains = list.contains(del);

删除数据：
[cpp]
list.removeAt(2);
list.remove(del);

遍历：
[cpp]
for(List<NSString*>::iterator it = list.begin() ;it != list.end() ; it++)
cout << [(*it) UTF8String ]<<" " ;

或使用foreach:
[cpp]
__block NSString* str;
for_each(list.begin(), list.end(), ^(NSString *value){
&n

补充：软件开发 , C++ ,