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Friday, February 26, 2010

How to check the directory exists or not from Makefile??

If the directory exists means, no need to untar the file.


if test -d DIR_NAME ; then echo NO NEED TO UNTAR ; else tar -xvf FILE.tar ; fi

Thursday, February 4, 2010

Singleton Design Pattern with example C++ code

The Singleton design pattern ensures only one instance of a class in an application. For example, Interfaces object need by both GUI and Back-end class. But only one interface object enough for the whole application (GUI + interface + Back-end)

Here need to develop the interface class as a Singleton class.

static CInterface *s_ptrInterface = 0;

class CInterface
~ CInterface();
static CInterface* getInterface()
 lock(); // for thread safe.
if( 0 != s_ptrInterface )
s_ptrInterface = new CInterface();

return s_ptrInterface ;
Need to create the object for CInterface like below,
CInterface:: getInterface() // it’s always return the same object

Wednesday, February 3, 2010

Photograph Puzzle Maker

try this site,

Tuesday, February 2, 2010

Object slicing example in C++

class Pet


string pname;


Pet(const string& name) : pname(name) {}

virtual string name() const { return pname; }

virtual string description() const { return "This is " + pname; }


class Dog : public Pet


string favoriteActivity;


Dog( const string& name, const string& activity): Pet(name), favoriteActivity(activity) {}

string description() const { return Pet::name() + " likes to " + favoriteActivity; }


void describe(Pet p)

{ // Slices the object

cout << p.description() << endl;


int main()


Pet p("Alfred");

Dog d("Fluffy", "sleep");