Re: Templating classes
On Jun 1, 4:39 pm, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
MathStuf wrote:
I am working on a class that will be a matrix based on a vector of
vectors. I am having trouble with the following code causing errors on
compilation:
template<class T> class MatrixBase
{
public:
MatrixBase()
{
width = 0;
height = 0;
Those are better initialised.
matrix.clear();
No need to clear a freshly constructed vector.
}
MatrixBase(const unsigned w, const unsigned h, const T &d = T())
{
matrix.resize(w, std::vector<T>(h, d));
width = w;
height = h;
Again, those are better initialised than assigned.
Ah, thanks.
That's because it doesn't believe that 'std::vector<T>::iterator' is
in fact a type. Use 'typename' to tell it.
It also says
that 'height' and 'width' are undeclared.
Where?
Hmm...guess I should have looked exactly where it was getting mixed up
there. It's in the following code:
template<class T> class Matrix : public MatrixBase<T>
{
public:
Matrix()
{
width = 0;
height = 0;
matrix.clear();
}
// More methods
};
Since matrix, height, and width are protected, shouldn't they be
available to any class which inherits MatrixBase and invisible to
external interfaces? Or do I have it backwards?
Should I move the variable
definitions up to the top of the class or should the methods be
outside of it entirely?
Not sure what you're asking here, sorry.
I thought that the problem may have been matrix being defined after
the methods. It's a moot point now, since the typename fixed it.