Databases
StackOverflow2013
Postsdbo
POmultiple linked lists for different objects in c++
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POmultiple linked lists for different objects in c++
    primarykey
    data
    text
    <p>consider these classes (simplified)</p> <pre><code>class Character { public: char name[20]; char type[20]; int strength; }; class inventoryItem { public: char name[20]; }; class weapon: public inventoryItem { public: int magical resistance; }; class spell: public inventoryItem { public: int magical power; }; </code></pre> <p>i have written a class for a linked list (not allowed to use stl list)</p> <pre><code>class list { public: struct listItem { listItem* objectPointer; listItem* pnext; }*phead; list() { phead=NULL; } bool isEmpty(){ if (!phead) return true; else return false; } void addToBack(listItem *itemtoadd) { listItem *ptemp; listItem *ppast; listItem *pNewItem; pNewItem=new listItem(); pNewItem-&gt;objectPointer=itemtoadd; pNewItem-&gt;pnext=NULL; if (phead==NULL) phead=itemtoadd; else { ptemp=phead; while(ptemp) { ptemp= ptemp-&gt;pnext; } ptemp-&gt;pnext=itemtoadd; } } }; </code></pre> <p>I have cut this down a lot but my question is , is there an easy way to create linked lists for all these using the same list class ? or am I wasting my time ?</p> <p>every time I have tried it cant convert the pointer from type 'weapon' to type 'listitem'<br> I need a list of characters and a list of each weapon or spell for that character<br> I'm still a beginner with OOP and pointers , the program I have now compiles and I have a list of characters working , however the list is not managed by the class its managed within some other functions, I'm hoping there's a way for one class to deal with it all , can anyone help explain it to me ?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USuser1652319
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou say you're not allowed to use STL, so clearly this is some sort of assignment with restrictions. Are you allowed to use templates / have you learned about them?
      singulars
      1. POmultiple linked lists for different objects in c++
      1. USsvk
    2. CO@svk Yes i've looked into templates briefly, and it doesn't specifically say I cant use them , but I am trying to get my head around how classes work together , and in theory I would have thought it was possible , but I'm struggling . Would you suggest templates are the way to with this?
      singulars
      1. POmultiple linked lists for different objects in c++
      1. USuser1652319
    3. COYes, templates are the "proper" way to do this. The solution you're not allowed to use is from the STL (the Standard Template Library) and is done with templates. But templates are a fairly advanced part of C++, and you will likely have trouble with them if you're a beginner. By now there are answers which suggest simpler ways, you might want to use one of those.
      singulars
      1. POmultiple linked lists for different objects in c++
      1. USsvk
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload