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POConfusing segmentation fault
 

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  1. POConfusing segmentation fault
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    <p><strong>EDIT:</strong> I basically revamped the whole question so I could provide an executable example...</p> <p>I have been getting a segmentation fault that I can't figure out. Here is a compacted version of my code. I maintained the original class hierarchy even though some of the classes have no relevant methods since I think that it has something to do with my issue, especially after some of the comments I've been getting.</p> <pre><code>#import &lt;vector&gt; using namespace std; template&lt;class Data = float&gt; class Vector { // All pure virtual functions. }; template&lt;class Data&gt; class TranslationVector : public virtual Vector&lt;Data&gt; { // All pure virtual functions. }; template&lt;class Data&gt; class SimpleVector4 : public virtual Vector&lt;Data&gt; { public: SimpleVector4(const Data d0, const Data d1, const Data d2, const Data d3) { fData = new vector&lt;Data&gt; ; fData-&gt;push_back(d0); fData-&gt;push_back(d1); fData-&gt;push_back(d2); fData-&gt;push_back(d3); } vector&lt;Data&gt;* getData() { return (fData); } private: vector&lt;Data&gt;* fData; }; template&lt;class Data&gt; class SimpleTranslationVector4 : public SimpleVector4&lt;Data&gt; , public TranslationVector&lt;Data&gt; { public: SimpleTranslationVector4(const Data x, const Data y, const Data z, const Data w) : SimpleVector4&lt;Data&gt; (x, y, z, w) { } }; template&lt;class Data = float&gt; class Matrix { // All pure virtual functions. }; template&lt;class Data&gt; class TransformationMatrix : public virtual Matrix&lt;Data&gt; { // All pure virtual functions. virtual void translate(TranslationVector&lt;Data&gt;* const translation) = 0; }; template&lt;class Data&gt; class SimpleMatrix44 : public virtual Matrix&lt;Data&gt; { public: SimpleMatrix44() { fData = new vector&lt;Data&gt; (CELLS_IN_MATRIX, 0); setIdentity(); } vector&lt;Data&gt;* getData() { return (fData); } void setIdentity() { fData-&gt;at(0) = 1; fData-&gt;at(1) = 0; fData-&gt;at(2) = 0; fData-&gt;at(3) = 0; fData-&gt;at(4) = 0; fData-&gt;at(5) = 1; fData-&gt;at(6) = 0; fData-&gt;at(7) = 0; fData-&gt;at(8) = 0; fData-&gt;at(9) = 0; fData-&gt;at(10) = 1; fData-&gt;at(11) = 0; fData-&gt;at(12) = 0; fData-&gt;at(13) = 0; fData-&gt;at(14) = 0; fData-&gt;at(15) = 1; } private: static const int CELLS_IN_MATRIX = 16; vector&lt;Data&gt;* fData; }; template&lt;class Data&gt; class SimpleTransformationMatrix44 : public SimpleMatrix44&lt;Data&gt; , public TransformationMatrix&lt;Data&gt; { public: SimpleTransformationMatrix44() : SimpleMatrix44&lt;Data&gt; () { } void translate(TranslationVector&lt;Data&gt;* translation) { vector&lt;Data&gt; *data = SimpleMatrix44&lt;Data&gt;::getData(); vector&lt;Data&gt; *transData = ((SimpleVector4&lt;Data&gt;*) translation)-&gt;getData(); // The error occurs on this line: data-&gt;at(12) += data-&gt;at(0) * transData-&gt;at(0) + data-&gt;at(4) * transData-&gt;at(1) + data-&gt;at(8) * transData-&gt;at(2); data-&gt;at(13) += data-&gt;at(1) * transData-&gt;at(0) + data-&gt;at(5) * transData-&gt;at(1) + data-&gt;at(9) * transData-&gt;at(2); data-&gt;at(14) += data-&gt;at(2) * transData-&gt;at(0) + data-&gt;at(6) * transData-&gt;at(1) + data-&gt;at(10) * transData-&gt;at(2); data-&gt;at(15) += data-&gt;at(3) * transData-&gt;at(0) + data-&gt;at(7) * transData-&gt;at(1) + data-&gt;at(11) * transData-&gt;at(2); } }; int main(int argc, char** argv) { SimpleTransformationMatrix44&lt;float&gt; matrix1; matrix1.translate(new SimpleTranslationVector4&lt;float&gt; (0.0f, 10.0f, 0.0f, 1.0f)); return 0; } </code></pre> <p>I have commented in the code where the error occurs. From debugging I can see that it actually occurs in the <code>size()</code> function of <code>vector</code> and that <code>transData</code> has not been initialized. I can't for the life of me figure out why <code>transData</code> has not been initialized! Any ideas?</p> <p>Thanks,</p> <p>Gaz.</p>
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    1. USGary Buyn
    1. USGary Buyn
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      1. VTUpMod
    1. COCould you give more details on how `transData` is obtained ? Eg. how `SimpleVector4<Data>::getData()` is defined. How `TranslationVector<Data>` relates to `SimpleVector4<Data>`. Why you cast away the const. How `SimpleTranslationVector4<float>` is defined. Etc.
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      1. POConfusing segmentation fault
      1. USSander De Dycker
    2. CO`(SimpleVector4<Data>*) translation` why this typecasting ?
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      1. USiammilind
    3. COThis sounds like an interesting question and I would like to try it out, but you didn't provide something that I can easily compile and run so my attention will go somewhere else. Bye. http://sscce.org
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      1. POConfusing segmentation fault
      1. USDavid Grayson
 

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