event-driven

I have the following example code, which is the standard basis of event-driven APIs in other programming languages, but in Rust the borrow checker blocks it with "cannot borrow p1 as mutable more than once at a time": struct Pen { color_cmyk: u32, ink: usize, } impl Pen { pub fn new() -> Pen { Pen { color_cmyk: 0x80800000, ink: 20000, } } pub fn write(&mut self, text: &str) -> bool { if self.ink < text.len() { return false; } self.ink -= text.len(); true } } fn main() { println!("Hello, world !"); let mut p1 = Pen::new(); p1.write("Hello"); println!("ink: {}, color: {}", p1.ink, p1.color_cmyk)

I have some JavaScript code in an HTML page with a button. I have a function called 'click()' that handles the onClick event of the button. The code for the button is as follows: <input type="button" onClick="click()">button text</input> The problem is that when the button is clicked, the function is not called. What am I doing wrong here? Thanks Two observations: You should write <input type="button" value="button text" /> instead of <input type="button">button text</input> You should rename your function. The function click() is already defined on a button (it simulates a click), and gets a

I'm trying to implement an event driven process with system call or subprocess. Basically I want to launch a non-blocking system command and upon completion of that system call, I want a function to be called. This is so that I can start a GUI progress bar, launch a system command and have the progress bar continue, and when the system call finishes, have the progress bar stop. What I want to absolutely NOT DO, is to spawn a process, get its process ID and keep checking for the completion of that process in a while loop. Below is just an example of how I imagine this should work (All of these