`GF2::Matrix` — Iterate and Potentially Change Elements

Methods to set or flip the element values in a bit-matrix based on the return value from a function call.

constexpr Matrix &set_if(std::invocable<std::size_t, std::size_t> auto f);    (1)
constexpr Matrix &flip_if(std::invocable<std::size_t, std::size_t> auto f);   (2)

1	Sets element at `(i, j)` to 1 if `f(i,j) != 0`, otherwise sets it to 0.
2	Flips the value of element `(i, j)` if `f(i,j) != 0`, otherwise leaves it unchanged.

f is a function that we expect to call as f(i,j) for each index pair.

Returns

Both methods return a reference to *this so can be chained with other calls.

Example

#include <GF2/GF2.h>
int main()
{
    GF2::Matrix<> m(4,8);
    std::cout << "m:\n" << m << '\n';
    m.set_if([](std::size_t i, std::size_t j) { return (i + j) % 2; });
    std::cout << "m:\n" << m << '\n';
    m.flip_if([](std::size_t i, std::size_t j) { return (i + j) % 2; });
    std::cout << "m:\n" << m << '\n';
}

Output

GF2::Matrix — Iterate and Potentially Change Elements

`GF2::Matrix` — Iterate and Potentially Change Elements