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POFinding memory allocation error
 

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  1. POFinding memory allocation error
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    <p>I'm getting memory allocation errors (and a subsequent crash) on the following simplified code:</p> <pre><code>std::wstring myKey = L"str_not_actually_constant"; MyType obj; Read( obj ); std::map&lt;std::wstring, MyType&gt; myMap; myMap[myKey] = obj; // Sometimes allocation error (1) ... Read( MyType&amp; obj ) { obj.member1 = ReadFromFuncThatMayBeProblem(); obj.member2 = ReadFromFuncThatMayBeProblem(); // Sometimes allocation error (2) /* more members */ } ... void operator =( const MyType&amp; source ) { if( this != &amp;source ) { member1 = source.member1; // std::wstring member2 = source.member2; // Usually (1) happen on the second member. // std::wstring /* more members */ } } </code></pre> <p>Either (1) or (2) occur.</p> <p>Now, if I simply continue on regardless of the error (with the debugger), the value is indeed entered in the map.</p> <p>I don't know if ReadFromFuncThatMayBeProblem() is the culprit but it's a fairly complex function that I cannot devulge here.</p> <p>Also, this is code that has worked (or at least appeared to work) before other sections of the application was ported to use OpenSSL. I don't know if that may have had any effect here, though.</p> <p>So, what can I do to track down this allocation error, since I'm presuming that the above code is not in fact the problem?</p> <p>Edit: More info: There is no dtor for MyType. </p> <p>However, MyType has a member of type SecondType that has a void* member. This is being deleted and null'd in that type's destructor. The constructor uses m_pData = new std::wstring( <em>( (std::wstring</em> )source.m_pData) ); for strings. (And similar for other data types). Could that be an issue? (delete static_cast&lt; std::wstring* >( m_pData );)</p> <p>The other member types of MyType are std::wstring, unsigned long, bool, enum, structs (timeb among them) and SecondType. </p>
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    1. USFredrik Ullner
    1. USFredrik Ullner
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      1. VTUpMod
    2. VO
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    1. CODo you have a complete test case, one we could try out?
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      1. USoutis
    2. CODoes MyType contains any pointer member variables? in that case, copy ctor and assignment operator written properly?
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      1. USNaveen
    3. COoutis: No, sorry. I can't provide that. Naveen: There's no pointer member variables.
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      1. USFredrik Ullner
 

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