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POc++ Segmentation fault in destructor child class
 

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  1. POc++ Segmentation fault in destructor child class
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    <p>hi i am delevop a multicontainner using templates, but i am getting a segmentation fault from the child class destructor, here is the code:</p> <pre><code>#include &lt;algorithm&gt; #include &lt;map&gt; #include &lt;iostream&gt; class BaseType{ public: virtual ~BaseType(){} virtual BaseType * clone() const =0; }; template&lt;typename T&gt; class DataType : public BaseType { public: DataType(const T &amp; aValueData = T()):mValue(aValueData) { // new DataType&lt;T&gt;(*this) } ~DataType(){ } BaseType * clone() const { return new DataType&lt;T&gt;(*this); } T mValue; }; class MValueData { public: template&lt;typename T&gt; MValueData(T const &amp; aAnyValue = T()):mTypeData(0),isDelete(false) { std::cout&lt;&lt;"Object Address before create object: "&lt;&lt;mTypeData&lt;&lt;std::endl; mTypeData=new DataType&lt;T&gt;(aAnyValue); std::cout&lt;&lt;"Object Address after create object"&lt;&lt;mTypeData&lt;&lt;std::endl; } ~MValueData(){ std::cout&lt;&lt;"Object Address "&lt;&lt;mTypeData&lt;&lt;std::endl; delete mTypeData; mTypeData=0; } MValueData() { mTypeData=0; } template&lt;typename T&gt; MValueData(const MValueData &amp; aCopy) { mTypeData= new DataType&lt;T&gt;(); *mTypeData=aCopy.mTypeData; } template&lt;typename T&gt; const MValueData &amp; operator=(const MValueData &amp; aCopy) { mTypeData= new DataType&lt;T&gt;(); *mTypeData=aCopy.mTypeData; //MValueData(aCopia).swap(*this); } void swap(MValueData&amp; other) { std::swap(this-&gt;mTypeData, other.mTypeData); } template &lt;typename T&gt; T&amp; get() { return dynamic_cast&lt;DataType&lt;T&gt;&amp;&gt;(*this-&gt;mTypeData).mValue; } bool operator &lt;(const MValueData &amp;rhs) const { return (mTypeData&lt;rhs.mTypeData); } template&lt;typename T&gt; void setValue(T const &amp; anyValue=T()) { mTypeData= new DataType&lt;T&gt;(anyValue); } BaseType *mTypeData; private: bool isDelete; }; int main() { MValueData aAnyType_1(0.22); aAnyType_1.get&lt;double&gt;(); MValueData aAnyType_2(false); std::map&lt;MValueData , MValueData&amp;&gt; mMapa; mMapa.insert(std::pair&lt;MValueData , MValueData&amp;&gt;(aAnyType_1,aAnyType_2)); // mMapa.find(aAnyType_1); return 0; } </code></pre> <p>I am using GDB to determinate the bug but i cannot see proper way to fix, the segmentacion stop when i comment this line:</p> <pre><code> ~MValueData(){ // if(mTypeData) delete mTypeData; } </code></pre> <p>Only then it run propperly, but it seems that i am creating a memory leak. Updated:std::map create copys of the object that i insert into, the object is destroyed twice, one when exit the main function and another when std::map is destroying it self, any hint? thx in advance!</p>
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