Chapter 07 - Damage get_available_exits() function errors

Review the Chapter 07 - Damage tutorial and compare its get_available_exits example with the trait implementation at src/map.rs:117. Update the tutorial's Vec return and declaration to match the rltk::SmallVec type shown by the compiler, then verify that the Chapter 07 code builds and produces the expected monster behavior.

Hello,

I am working through the tutorial you have online for Rust and Rltk. I am on Chapter 07 - Damage and was hitting an error when you had us add

fn get_available_exits(&self, idx:usize) -> Vec<(usize, f32)> {
    let mut exits : Vec<(usize, f32)> = Vec::new();
    let x = idx as i32 % self.width;
    let y = idx as i32 / self.width;
    let w = self.width as usize;

    // Cardinal directions
    if self.is_exit_valid(x-1, y) { exits.push((idx-1, 1.0)) };
    if self.is_exit_valid(x+1, y) { exits.push((idx+1, 1.0)) };
    if self.is_exit_valid(x, y-1) { exits.push((idx-w, 1.0)) };
    if self.is_exit_valid(x, y+1) { exits.push((idx+w, 1.0)) };

    // Diagonals
    if self.is_exit_valid(x-1, y-1) { exits.push(((idx-w)-1, 1.45)); }
    if self.is_exit_valid(x+1, y-1) { exits.push(((idx-w)+1, 1.45)); }
    if self.is_exit_valid(x-1, y+1) { exits.push(((idx+w)-1, 1.45)); }
    if self.is_exit_valid(x+1, y+1) { exits.push(((idx+w)+1, 1.45)); }

    exits
}

To the BaseMap impl. The error I was receiving was:

error[E0053]: method `get_available_exits` has an incompatible type for trait
   --> src/map.rs:117:5
    |
117 |     fn get_available_exits(&self, idx:usize) -> Vec<(usize, f32)> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `smallvec::SmallVec`, found struct `std::vec::Vec`
    |
    = note: expected fn pointer `fn(&map::Map, _) -> smallvec::SmallVec<[(usize, f32); 10]>`
               found fn pointer `fn(&map::Map, _) -> std::vec::Vec<(usize, f32)>`

After looking over the source code you provide I found that instead of using Vec like you have in the tutorial you used rltk::SmallVec. After changing my code to use rltk::SmallVec the error went away and I was getting the expected monster behavior.

Just wanted to bring this up in case others have hit this issue.