Since I use 2d arrays in several places, I've put together a small class
to make things a bit neater. Here's my first attempt, it only supports
accessing elements and resizing (because this is all I need).
Joe
/*
matrix.hh -- declare and implement 2d arrays
source file of the Flower Library
(c) 2006 Joe Neeman <[EMAIL PROTECTED]>
*/
#ifndef MATRIX_HH
#define MATRIX_HH
#include "std-vector.hh"
template<class T, class A=std::allocator<T> >
class Matrix
{
public:
Matrix<T, A> ()
{
rank_ = 0;
}
Matrix<T, A> (vsize rows, vsize columns, T const &t)
: data_(rows * columns, t)
{
rank_ = rows;
}
const T &at (vsize row, vsize col) const
{
assert (row < rank_ && col * rank_ + row < data_.size ());
return data_[col * rank_ + row];
}
T &at (vsize row, vsize col)
{
assert (row < rank_ && col * rank_ + row < data_.size ());
return data_[col * rank_ + row];
}
void resize (vsize rows, vsize columns, T const &t)
{
if (rows == rank_)
data_.resize (rows * columns, t);
else
{
vector<T,A> new_data;
new_data.resize (rows * columns, t);
vsize cur_cols = rank_ ? data_.size () / rank_: 0;
for (vsize i = 0; i < cur_cols; i++)
for (vsize j = 0; j < rank_; j++)
new_data[i*rows + j] = data_[i*rank_ + j];
rank_ = rows;
data_ = new_data;
}
}
private:
vector<T, A> data_;
vsize rank_;
};
#endif /* MATRIX_HH */
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