`bit::matrix` — Alter Elements

We have methods to set elements in a bit-matrix to 1, reset them to 0, or flip them from 0 to 1 and vice versa. These methods can work on the entire bit-matrix, individual elements, or diagonal elements.

.The entire bit-matrix

1constexpr bit::matrix &set();
constexpr bit::matrix &reset();
constexpr bit::matrix &flip();

2constexpr bit::matrix &set(std::size_t i, std::size_t j);
constexpr bit::matrix &reset(std::size_t i, std::size_t j);
constexpr bit::matrix &flip(std::size_t i, std::size_t j);

3constexpr bit::matrix &set_diagonal(int d = 0);
constexpr bit::matrix &reset_diagonal(int d = 0);
constexpr bit::matrix &flip_diagonal(int d = 0);

1: Sets, resets, or flips the elements in the bit-matrix.
2: Sets, resets, or flips the element at the index pair (i, j).
3: Sets, resets, or flips the elements on a diagonal.
By default, the elements are on the main diagonal.
If d > 0, they’re on a super-diagonal, while if d < 0, they’re on a sub-diagonal.

All these methods return a reference to *this so they can be chained with other calls.

Example

#include <bit/bit.h>
int main()
{
    bit::matrix<> m(4);
    std::cout << "Original:\n"            << m                    << '\n';
    std::cout << "set:\n"                 << m.set()              << '\n';
    std::cout << "reset:\n"               << m.reset()            << '\n';
    std::cout << "flip:\n"                << m.flip()             << '\n';
    std::cout << "reset_diagonal():\n"    << m.reset_diagonal()   << '\n';
    std::cout << "reset_diagonal(1):\n"   << m.reset_diagonal(1)  << '\n';
    std::cout << "flip_diagonal(-1):\n"   << m.flip_diagonal(-1)  << '\n';
}

Output

Original:
│0 0 0 0│
│0 0 0 0│
│0 0 0 0│
│0 0 0 0│
set:
│1 1 1 1│
│1 1 1 1│
│1 1 1 1│
│1 1 1 1│
reset:
│0 0 0 0│
│0 0 0 0│
│0 0 0 0│
│0 0 0 0│
flip:
│1 1 1 1│
│1 1 1 1│
│1 1 1 1│
│1 1 1 1│
reset_diagonal():
│0 1 1 1│
│1 0 1 1│
│1 1 0 1│
│1 1 1 0│
reset_diagonal(1):
│0 0 1 1│
│1 0 0 1│
│1 1 0 0│
│1 1 1 0│
flip_diagonal(-1):
│0 0 1 1│
│0 0 0 1│
│1 0 0 0│
│1 1 0 0│

See Also