View Full Version : pointers help

May 10th, 2007, 11:01 PM
right, so im using c++ and the guichan gui library (its pretty nice :)) and tinyXML (which is also very good).

Right now my problem,

when for example you define a widget of button type in guichan it is gcn::Button* button, now i have a vector of these and wish to pass the vector by reference into the function:

the function prototype looks like:

function (vector <gcn::Button*>* buttons);

now, in that function i can access buttons->size() perfectly well, however when i try and access a specific member of the vector and its members i get an error saying that the member doesn't contain a member function of the name im trying to call (when it does).

hopw this is all making sense, ive just got myself in a bit of a muddle as if been chopping and changing things trying to make it work and have managed to confuse myself even more in the process.

thanks in advanced,


May 11th, 2007, 05:20 AM
My first observation is that you shouldn't be storing raw pointers in a vector. Use a shared pointer instead.

Secondly, passing a vector in by reference can be done with the &.

function(vector<gcn::Button*>& buttons)

Now if you still want to do it your way, and a gcn::Button has a method getName, you can access it by

for (std::size_t i = 0, max = buttons->size(); ++i; i < max)
sometype name = (*buttons)[i]->getName();
// ...