Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>It's not clear how you are going to use <code>stuff</code> in your example, so I'm going to give you a few different options. </p> <ol> <li><p><code>thing</code> stores its own copy of <code>stuff</code>.<br> In this case your class stores an object of type <code>std::list&lt;char*&gt;</code>.</p> <pre><code>class thing { public: thing(std::list&lt;char*&gt;&amp; aList):m_list(alist){} std::list&lt;char*&gt; m_list; }; </code></pre> <p>When you construct <code>thing</code> copy of <code>stuff</code> is made and stored in the class. When the object is destructed it will automatically deallocate <code>m_list</code>. </p></li> <li><p><code>thing</code> stores a weak reference to <code>stuff</code>.<br> Your class will store a pointer (<code>std::list&lt;char*&gt;* m_list</code>) or reference (<code>std::list&lt;char*&gt;&amp; m_list</code>). <code>thing</code> will be able to use your list in any way, but it shouldn't be in charge of resource management. If the list is in a smaller scope than <code>thing</code> then you'll be left with a hanging reference.</p> <pre><code>thing getThing() { std::list&lt;char*&gt; list1; thing object1(list1); return object1; //bad - list will be deallocated, object1 will have a hanging reference } </code></pre></li> <li><p><code>thing</code> stores a shared pointer to <code>stuff</code>. This is the method that is most like <code>retain</code> in Objective C. C++ doesn't have automatic reference counting. If you want to store an object reference with shared ownership you can use an <code>std::shared_ptr</code>. <code>thing</code> stores <code>std::shared_ptr&lt;std::list&lt;char*&gt;&gt; m_list</code>.</p> <pre><code>std::shared_ptr&lt;std::list&lt;char*&gt;&gt; stuff = std::make_shared&lt;std::list&lt;char*&gt;&gt;(); thing object(stuff); //reference count incremented, even if stuff is destroyed object will still hold a valid reference </code></pre></li> </ol>
    singulars
    1. This table or related slice is empty.
    1. POC++ Object Retaining?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USElliot Hatch
    1. USElliot Hatch
    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. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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