Hello Prpgrammers,

Could any one help me with the meaning of this:

std::vector<AIDA::IHitogram1D*> histo;

AIDA is a namespace and IHistogram1D is a class defined inside it.

Tahnks in advance

vector is a STL container, you can add elements to it ( primitives, objects, etc ) dynamically and it can grow as you add elements to it. To be short of course, STL, i.e. Standard Template Library is a topic for many books.

It seems that "histo" is collection of Histograms objects instantiated from the class "IHistogram1D"

bbcc vector is standart template container.....it has this view

vector<type> array(10)..... argument isn't necessary...your type can be both from standart types and types defined by users......for example

vector<int>,vector<char*>,vector<Dog>........suppose Dog is class.....

the same situation is in your example.....IHistogram1D is type and your vector container contains members which are type of IHistogram1D*....