void prog1_static(void){    int pos = 9;    // elem will hold the element's value    vector
     
       *elem;    elem = fibon_seq2(pos);    cout << elem->size() << endl;    for (int in = 0; in < elem->size(); in++)    {        cout << elem[0][in] <<" ";    }    cout << endl;    pos = 18;    elem = fibon_seq2(pos);    cout << elem->size() << endl;    for (int in = 0; in < elem->size(); in++)    {        cout << elem[0][in] <<" ";    //error    }    cout << endl;}
     

 

下面的函数返回elems的地址。可以返回静态对象的地址

 

通过去读取vector的返回值可以实现减少计算工作量的方法。

cout << elem[0][in] <<" ";

这个用法一定要注意，试了很就才发现。

elem是一个向量指针，这个指针指向某一个向量的，

因此类似于c语言中一个指针指向二位数组。

 

vector
     
       *fibon_seq2( int size ){    const int max_size = 1024;    static vector< int > elems;    if ( size <= 0 || size > max_size )    {        cerr << "fibon_seq(): oops: invalid size: "             << size << " -- can锟絫 fulfill request.\n";        return 0;    }    // if size is equal to or greater than elems.size(),    // no calculations are necessary ...    for ( int ix = elems.size(); ix < size; ++ix )    {        if ( ix == 0 || ix == 1 )        {            elems.push_back( 1 );        }        else        {            elems.push_back( elems[ix - 1] + elems[ix - 2] );        }    }    return &elems;}