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POC++ - Casting a base class shared_ptr to a derived class shared_ptr
 

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  1. POC++ - Casting a base class shared_ptr to a derived class shared_ptr
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    <p>I tried reading through some topics that might have had the answer I was looking for, but I didn't get an answer.</p> <p>In any case. I have a class that holds a vector of shared_ptr's to a base (interface) class: IInputDevice.</p> <p>Here is the member vector in manager class: CInputManager:</p> <pre><code>// In class: CInputManager private: std::vector&lt;std::tr1::shared_ptr&lt;IInputDevice&gt;&gt; m_vecpInputDevices; </code></pre> <p>I also have a few helper functions, that is meant to retrieve a specific input device (i.e: keyboard, mouse, etc). </p> <p>In this case, I have a keyboard "getter" that calls the inputmanager's GetDevice function, that returns the smart_ptr in the vector, that has the specific input type ID.</p> <pre><code>inline std::tr1::shared_ptr&lt;CKeyboard&gt; GetKeyboard() { return CInputManager::GetInstance().GetInputDevice(CInputType::Keyboard()); } </code></pre> <p>The function is incomplete, as I need a cast of some sort, to get a </p> <pre><code>smart_ptr&lt;CKeyboard&gt; </code></pre> <p>type.</p> <p>Here is the "get" function in CInputManager, that searches the vector for the specific device:</p> <pre><code>std::tr1::shared_ptr&lt;IInputDevice&gt; CInputManager::GetInputDevice(CInputType type) { for( std::vector&lt;std::tr1::shared_ptr&lt;IInputDevice&gt;&gt;::iterator pDeviceIter = m_vecpInputDevices.begin(); pDeviceIter != m_vecpInputDevices.end(); pDeviceIter++) { if( (*pDeviceIter)-&gt;GetInputType() == type ) return (*pDeviceIter); } return NULL; </code></pre> <p>}</p> <p>The CInputType class also has a overloaded == operator, to check only if the ID's match. Hence the</p> <pre><code>if( (*pDeviceIter)-&gt;GetInputType() == type ) return (*pDeviceIter); </code></pre> <p>So, I'd love to hear from you guys if you have a smart, simple cast/solution to this problem, as you can notice that I'd like helper functions to retrieve a specific device.</p> <p>Thanks, and regards, Oyvind</p>
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    1. PTQuestion
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    1. USOyvind Andersson
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    1. COstd::static_pointer_cast or std::dynamic_pointer_cast are probably what you're looking for - they're the shared_ptr equivalents of static_cast or dynamic_cast
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      1. POC++ - Casting a base class shared_ptr to a derived class shared_ptr
      1. USMike Vine
    2. COhere is a topic that will help you. http://stackoverflow.com/questions/1358143/downcasting-shared-ptrbase-to-shared-ptrderived?rq=1
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      1. POC++ - Casting a base class shared_ptr to a derived class shared_ptr
      1. USGabriel
    3. COThank you both! Got what I was looking for, but avoided dynamic casting all together with containers. But, first comment is correct and worked.
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      1. POC++ - Casting a base class shared_ptr to a derived class shared_ptr
      1. USOyvind Andersson
 

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