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POC++ working with smart pointers
 

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  1. POC++ working with smart pointers
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    <p>In my code, I have function prototype </p> <pre><code>void AddBenchNode(ref_ptr&lt;Group&gt; root ,ref_ptr&lt;Node&gt; benches, bool setAttitude = false, float scale_x =.15, float scale_y =15, float scale_z = 15, int position_x = 250, int position_y = 100, int position_z =0 ); </code></pre> <p>where ref_ptr is a smart pointer.</p> <p>In my main function, I define 2 smartpointers of type ref_ptr and ref_ptr and pass them to a call to my function, AddBenchNode. </p> <pre><code>ref_ptr&lt;Group&gt; root = new Group(); ref_ptr&lt;Node&gt; benches = readNodeFile("Models/test.ive"); AddBenchNode(root, benches, true); </code></pre> <p>When the call executes, nothing happens. As in no changes are made to the root pointer. What I want to know is if I am making this call correctly as I have it? Or do I have to re-define my function to take pointers to these smartpointers? </p> <p>Now I did try passing by reference</p> <pre><code>void AddBenchNode(osg::ref_ptr&lt;osg::Group&gt;&amp; root ,osg::ref_ptr&lt;osg::Node&gt;&amp; benches, bool setAttitude = false, float scale_x =.15, float scale_y =15, float scale_z = 15, int position_x = 250, int position_y = 100, int position_z =0 ); </code></pre> <p>That resulted in some linker errors. </p> <p><strong>Error 2 error LNK2001: unresolved external symbol "void __cdecl AddBenchNode(class osg::ref_ptr &amp;,class osg::ref_ptr &amp;,bool,float,float,float,int,int,int)" (?AddBenchNode@@YAXAAV?$ref_ptr@VGroup@osg@@@osg@@AAV?$ref_ptr@VNode@osg@@@2@_NMMMHHH@Z) Error 3 error LNK1120: 1 unresolved externals</strong> </p>
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    1. USuser272671
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    1. COWhat happens inside the function?
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      1. UStmpearce
    2. COGiven that `ref_ptr` doesn't appear to be part of the standard C++ library, perhaps you coudl tell us which library you are using? It is also very helpful if you can provide a simple, self-contained example which will compile and run to exhibit the problem you are seeing.
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      1. USRook
    3. COWhy do you expect the `root` pointer to change? It looks more like this is supposed to do something to the `Group` it points to, not the pointer itself. (But if it is supposed to change its argument, then it will need to take that argument by reference or pointer, as you say).
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      1. POC++ working with smart pointers
      1. USMike Seymour
 

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