namespace GiNaC {
+
+/** Helper template to allow initialization of matrices via an overloaded
+ * comma operator (idea stolen from Blitz++). */
+template <typename T, typename It>
+class matrix_init {
+public:
+ matrix_init(It i) : iter(i) {}
+
+ matrix_init<T, It> operator,(const T & x)
+ {
+ *iter = x;
+ return matrix_init<T, It>(++iter);
+ }
+
+ // The following specializations produce much tighter code than the
+ // general case above
+
+ matrix_init<T, It> operator,(int x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+ matrix_init<T, It> operator,(unsigned int x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+ matrix_init<T, It> operator,(long x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+ matrix_init<T, It> operator,(unsigned long x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+ matrix_init<T, It> operator,(double x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+ matrix_init<T, It> operator,(const symbol & x)
+ {
+ *iter = T(x);
+ return matrix_init<T, It>(++iter);
+ }
+
+private:
+ matrix_init();
+ It iter;
+};
+
+
/** Symbolic matrices. */
class matrix : public basic
{
matrix(unsigned r, unsigned c);
matrix(unsigned r, unsigned c, const exvector & m2);
matrix(unsigned r, unsigned c, const lst & l);
+
+ // First step of initialization of matrix with a comma-separated seqeuence
+ // of expressions. Subsequent steps are handled by matrix_init<>::operator,().
+ matrix_init<ex, exvector::iterator> operator=(const ex & x)
+ {
+ m[0] = x;
+ return matrix_init<ex, exvector::iterator>(++m.begin());
+ }
// functions overriding virtual functions from base classes
public: