OT: Stupid c++ (Roguelike development)

[narf poit chez BOOM]

So I'm trying to declare a vector. It declares fine in the main function. The only problem is, I need to declare it in one of the header files. Except that if I try to declare it in function I want to use it in in the header file, it tells me that ' `vector' undeclared (first use this function)'.

If I try to declare it outside the function, it tells me that 'expected constructor, destructor, or type conversion before '<' token'

So it seems like my header file can't access the vector code or something.