template meta programming - Page 5

Is it good to have a member template function inside a non-template class in c++?

- by tsubasa

I wonder if it is a good practice to have a member template function inside a non-template class in c++? Why?

Derived template override return type of member function C++

I am writing matrix classes. Take a look at this definition: template <typename T, unsigned int dimension_x, unsigned int dimension_y> class generic_matrix { ... generic_matrix<T, dimension_x - 1, dimension_y - 1> minor(unsigned int x, unsigned int y) const { ... } ... } template <typename T, unsigned int dimension> class generic_square_matrix : public generic_matrix<T, dimension, dimension> { ... generic_square_matrix(const generic_matrix<T, dimension, dimension>& other) { ... } ... void foo(); } The generic_square_matrix class provides additional functions like matrix multiplication. Doing this is no problem: generic_square_matrix<T, 4> m = generic_matrix<T, 4, 4>(); It is possible to assign any square matrix to M, even though the type is not generic_square_matrix, due to the constructor. This is possible because the data does not change across children, only the supported functions. This is also possible: generic_square_matrix<T, 4> m = generic_square_matrix<T, 5>().minor(1,1); Same conversion applies here. But now comes the problem: generic_square_matrix<T, 4>().minor(1,1).foo(); //problem, foo is not in generic_matrix<T, 3, 3> To solve this I would like generic_square_matrix::minor to return a generic_square_matrix instead of a generic_matrix. The only possible way to do this, I think is to use template specialisation. But since a specialisation is basically treated like a separate class, I have to redefine all functions. I cannot call the function of the non-specialised class as you would do with a derived class, so I have to copy the entire function. This is not a very nice generic-programming solution, and a lot of work. C++ almost has a solution for my problem: a virtual function of a derived class, can return a pointer or reference to a different class than the base class returns, if this class is derived from the class that the base class returns. generic_square_matrix is derived from generic_matrix, but the function does not return a pointer nor reference, so this doesn't apply here. Is there a solution to this problem (possibly involving an entirely other structure; my only requirements are that the dimensions are a template parameter and that square matrices can have additional functionality). Thanks in advance, Ruud

Search Results

Search found 21559 results on 863 pages for 'template meta programming'.

Page 5/863 | < Previous Page | 1 2 3 4 5 6 7 8 9 10 11 12 | Next Page >

- by tsubasa

- by Ruud v A

- by Nelson

- by clifgray

- by ber4444

- by Fuxi

- by Fuxi

- by Hooman Ahmadi

- by uj2

- by Noodles

- by TheLQ

- by Jaime Soto

- by aditi

- by jonny

- by Baltazar Blake

- by toleero

- by donalbain

- by Oni

- by fabbianni

- by Ef Es

- by shan23

- by nayef harb

- by Giorgio

- by frowing

- by Chronix

< Previous Page | 1 2 3 4 5 6 7 8 9 10 11 12 | Next Page >