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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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FBB::Hostname(3bobcat)						     Host Info						    FBB::Hostname(3bobcat)

NAME
FBB::Hostname - Contains name/address info about a host SYNOPSIS
#include <bobcat/hostname> Linking option: -lbobcat DESCRIPTION
FBB::Hostname objects inherit from Hostent, and offers information about a host, like Hostent. Apart from being initialized by a hostname or host address, they can also be initialized by a FBB::InetAddress object. Most of the functionality of an FBB::Hostname object is avail- able through its parent-class FBB::Hostent. NAMESPACE
FBB All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB. INHERITS FROM
FBB::Hostent CONSTRUCTORS
o Hostname(): The default constructor initializes an empty FBB::Hostname object. o Hostname((std::string const &host)): This constructor initializes an FBB::Hostname object from a string representing the name or dotted decimal address of a host. An FBB::Errno object is thrown if the hostname information could not be retrieved. o Hostname(InetAddress const &inetAddress): This constructor initializes an FBB::Hostname object from an InetAddress object. An FBB::Errno object is thrown if the hostname information could not be retrieved. The copy constructor is available. MEMBER FUNCTIONS
All members of FBB::Hostent are available, as FBB::Hostname inherits from this class. There are no additional members. EXAMPLE
#include <iostream> #include <bobcat/hostname> #include <bobcat/errno> using namespace std; using namespace FBB; int main(int argc, char **argv) { while (true) { cout << "Enter name or address: "; string str; if (!getline(cin, str)) return 0; if (str == "") break; try { Hostname h(str); cout << "Official name: "; cout << h.hostname() << endl; cout << "Aliases: "; for (size_t idx = 0; idx < h.nAliases(); idx++) cout << h.alias(idx) << " "; cout << endl; cout << "Adresses: "; for (size_t idx = 0; idx < h.nAddresses(); idx++) cout << h.dottedDecimalAddress(idx) << " "; cout << endl; } catch (Errno const &err) { cout << err.why() << endl; } } return 0; } FILES
bobcat/hostname - defines the class interface SEE ALSO
bobcat(7), hostent(3bobcat) BUGS
None Reported. DISTRIBUTION FILES
o bobcat_3.01.00-x.dsc: detached signature; o bobcat_3.01.00-x.tar.gz: source archive; o bobcat_3.01.00-x_i386.changes: change log; o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries; o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages; o http://sourceforge.net/projects/bobcat: public archive location; BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'. COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL). AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl). libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::Hostname(3bobcat)
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