"YYW" <yyw1_25@sohu.com> wrote
why the codes below is wrong in g++ 3.4.2? an error occurs in the line: cout<<CMatrix<double>::eye(5); -------------------------------------- #include <ostream> #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/io.hpp>
using namespace boost::numeric::ublas; using namespace std;
template <class T> class CMatrix { matrix<T>mat_;
public: CMatrix(const identity_matrix<T>& m) { mat_ = m; } static CMatrix<T> eye(int size) { return identity_matrix<T>(size); }
template <class T_> friend ostream& operator << (ostream& os, CMatrix<T_>& m); };
template<class T_> ostream& operator << (ostream& os, CMatrix<T_>& m)
Try this: ostream& operator << (ostream& os, const CMatrix<T_>& m) Regards, Arkadiy