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Full Discussion: C++ program crashes
Top Forums Programming C++ program crashes Post 302393906 by royalibrahim on Wednesday 10th of February 2010 01:45:48 AM
Old 02-10-2010
C++ program crashes

Hi,

Could anyone tell me the reason why the following program crashes?

Code:
class A {
    int x;
public:
    A() {
        cout << "from A()" << endl;
    }

    ~A() {
        cout << "from ~A()" << endl;
    }
};

class B : public A {
public:
    B() {
        cout << "from B()" << endl;
    }

    virtual ~B() {
        cout << "from ~B()" << endl;
    }
};

int main() {
    A* a = new B;
    delete a;
}

when I drilled down the core-dump, I got *** glibc detected *** a.out: free(): invalid pointer: 0x0804a00c ***

I know the base class destructor need to be declared "virtual". But what is the exact reason for crashing?
 

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NAME
Net::Google::Code::Issue::Comment - Issue's Comment DESCRIPTION
ATTRIBUTES
project project name email, password user's email and password issue_id sequence sequence number, initial comment( when you create an issue ) has sequence 0 date content author updates HashRef that reflects updates attachments INTERFACE
parse( HTML::Element or html segment string ) parse format like the following: <td class="vt issuecomment"> <span class="author">Comment <a name="c18" href="#c18">18</a> by <a href="/u/jsykari/">jsykari</a></span>, <span class="date" title="Wed Sep 3 04:44:39 2008">Sep 03, 2008</span> <pre> <b>haha</b> </pre> <div class="attachments"> <table cellspacing="0" cellpadding="2" border="0"> <tr><td rowspan="2" width="24"><a href="http://chromium.googlecode.com/issues/attachment?aid=-1323983749556004507&amp;name=proxy_settings.png" target="new"><img width="16" height="16" src="/hosting/images/generic.gif" border="0" ></a></td> <td><b>proxy_settings.png</b></td></tr> <tr><td>14.3 KB <a href="http://chromium.googlecode.com/issues/attachment?aid=-1323983749556004507&amp;name=proxy_settings.png">Download</a></td></tr> </table> </div> <div class="updates"> <div class="round4"></div> <div class="round2"></div> <div class="round1"></div> <div class="box-inner"> <b>Cc:</b> thatan...@google.com<br><b>Status:</b> Available<br><b>Labels:</b> Mstone-X<br> </div> <div class="round1"></div> <div class="round2"></div> <div class="round4"></div> </div> </td> list google's api way to get list of comments return a list of loaded( no scraping is done here ) comments in list context, a ref to the list otherwise. parse_hybrid when $Net::Google::Code::Issue::USE_HYBRID is true, we will try to load comments with the google's official api, but as the api is not complete, we still need to do scraping to load something( e.g. attachments ), this method is used to do this. AUTHOR
sunnavy "<sunnavy@bestpractical.com>" LICENCE AND COPYRIGHT
Copyright 2008-2010 Best Practical Solutions. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-04-07 Net::Google::Code::Issue::Comment(3pm)
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