On Sun, 06 May 2007 09:11:10 -0700, MathStuf wrote:
I have a matrix class and I would like to add a method that is only
applicable when the template type is a of another class. How can I
specialize the class to allow for the new method and hide it with any
other type?
template<class T> class Matrix
{
public:
Matrix();
Matrix(Ini
&ini); // Only
applicable with MyClass
Matrix(unsigned w, unsigned h, T &d = T());
It is illegal to bind a rvalue to a non-const reference. Make this a
const T & if possible.
void ImportIni(Ini
&ini); // Only applicable
with MyClass
void ExportIni(std::ofstream &fout, const String &val);// Only
applicable with MyClass
void AddRow(T &d = T());
void AddCol(T &d = T());
bool InsertRow(unsigned pos, T &d = T()); bool InsertCol(unsigned
pos, T &d = T()); bool DeleteRow(unsigned pos);
bool DeleteCol(unsigned pos);
bool Set(unsigned row, unsigned col, T &s);
T Get(unsigned row, unsigned col);
std::vector<T> GetRow(unsigned row);
std::vector<T> GetCol(unsigned col);
unsigned GetHeight();
unsigned GetWidth();
T operator[](Point &p);
std::vector<T> operator[](int col);
private:
std::vector< std::vector<T> > matrix; unsigned height;
unsigned width;
};
You can do it with template specialization, like so:
template<class T> struct Base
{
// all common stuff from above
// ...
};
template<class T> struct Matrix : Base<T>
{
Matrix();
Matrix(unsigned w, unsigned h);
};
class MyClass;
class Ini;
template<> struct Matrix<MyClass> : Base<MyClass>
{
Matrix();
Matrix(unsigned w, unsigned h);
// additional stuff
Matrix(Ini &ini);
// ...
};
There is some unavoidable duplication for the constructors unfortunately.
--
Markus