171–174 of 174 posts
Earlier quoted context omitted.
How do you figure?
I don't understand the question. Here is the first example I found on Google if that helps you understand. std::variant package; std::visit(overload{ [](Fluid& ) { std::cout
match (state, pipe) {
(State::None, Pipe::Ground) => {
if inside {
n += 1;
}
}
(State::None, Pipe::Vert) => {
inside = !inside;
}
(State::None, Pipe::Se) => {
state = State::South;
}
(State::None, Pipe::Ne) => {
state = State::North;
}
// Horizontal lines make no difference to anything
(State::North | State::South, Pipe::Horiz) => {}
// U-turns
(State::South, Pipe::Sw) | (State::North, Pipe::Nw) => {
state = State::None;
}
// Form a vertical line
(State::South, Pipe::Nw) | (State::North, Pipe::Sw) => {
inside = !inside;
state = State::None;
}
_ => {
panic!("Unexpected sequence {state:?} {pipe:?}");
}
}Earlier quoted context omitted.
You don't have to write this, it already exists as the (unsafe of course) method Option::unwrap_unchecked Because all Rust's methods can be called as free functions, you can literally write Option::unwrap_unchecked for the same behaviour, or you can some_option.unwrap_unchecked() (in both cases you will need to be in unsafe context for this to be allowed and should write a SAFETY comment explaining why you're sure it…
I see. I didn't know that method existed despite spending ~4.5 years writing Rust.
Earlier quoted context omitted.
I don't understand the question. Here is the first example I found on Google if that helps you understand. std::variant package; std::visit(overload{ [](Fluid& ) { std::cout
But that's not really even a pattern match? Here's what a pattern match looks like: [This is from day 10 of last year's Advent of Code.] match (state, pipe) { (State::None, Pipe::Ground) => { if inside { n += 1; } } (State::None, Pipe::Vert) => { inside = !inside; } (State::None, Pipe::Se) => { state = State::South; } (State::None, Pipe::Ne) => { state = State::North; } // Horizontal lines make no difference to anyth…
Guess what, the same syntax I gave supports exactly that as well.