Databases
StackOverflow2013
Postsdbo
POHow to add a base class to a vector of derived classes
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to add a base class to a vector of derived classes
    primarykey
    data
    text
    <p>I have a <code>std::vector</code> that holds shared pointers to a derived class <code>cDerivedClass</code>, I also have shared pointers for the base class too. So something like this:</p> <pre><code>typedef SHARED_PTR&lt;cBaseClass&gt; cBaseClassPtr; typedef SHARED_PTR&lt;cDerivedClass&gt; cDerivedClassPtr; std::vector&lt;cDerivedClassPtr&gt; vDerivedPtrList; </code></pre> <p>Now if I want to have a <code>CDerivedClass::AddComponent(cBaseClassPtr inpBaseClass)</code> method that takes an argument of type cBaseClassPtr and adds it to the vector (vDerivedPtrList) of derived classes, how would I go about doing this? </p> <p>I know dynamic_cast won't work since base-to-derived conversions are not allowed with dynamic casts unless the base class is polymorphic. I've tried static casting the cBaseClassPtr to a cDerivedClassPtr, but I'm thrown an error. </p> <pre><code>void cDerivedClass::AddComponent(cBaseClassPtr inpBaseClass) { MY_ASSERT(inpBaseClass, "Component cannot be NULL"); cDerivedClassPtr pDerviedPtrToAdd = static_cast&lt;cDerivedClassPtr&gt;(inpBaseClass); this-&gt;mvComponentList.push_back(pDerviedPtrToAdd); } </code></pre> <p>Edit: To be exact this is the error I'm getting:</p> <pre><code>No matching conversion of static_cast from 'cBaseClassPtr' (aka 'shared_ptr&lt;cBaseClassPtr&gt;') to 'cDerivedClassPtr' (aka 'shared_ptr&lt;cDerivedClassPtr&gt;'); </code></pre> <p>I'm using boost's implementation of smart pointers<a href="http://www.boost.org/doc/libs/1_42_0/libs/smart_ptr/shared_ptr.htm" rel="nofollow"><code>boost::shared_ptr</code></a></p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USKillAWatt1705
    1. USKillAWatt1705
    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
    1. This table or related slice is empty.
    1. COWhy would you want to do that. Casting from base to derived class is a no no... Unless you know that base is the derived, but that could point to a bad design.
      singulars
      1. POHow to add a base class to a vector of derived classes
      1. USW.B.
    2. COPersonally, I see a design flaw here.
      singulars
      1. POHow to add a base class to a vector of derived classes
      1. USAlexander Shukaev
 

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