homework done

smart-house/power_socket_lib/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "power_socket_lib"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["rlib", "staticlib", "cdylib"]
+
+[dependencies]

smart-house/power_socket_lib/src/lib.rs

@@ -0,0 +1,45 @@
+#[repr(C)]
+pub struct PowerSocket {
+    power_rate: f32,
+    on: bool,
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn power_socket_new(power_rate: f32, on: bool) -> PowerSocket {
+    PowerSocket { power_rate, on }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn power_socket_is_on(power_socket: &PowerSocket) -> bool {
+    power_socket.on
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn power_socket_set_on(power_socket: &mut PowerSocket, on: bool) {
+    power_socket.on = on
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn power_socket_get_power(power_socket: &PowerSocket) -> f32 {
+    if power_socket.on { power_socket.power_rate } else { 0.0 }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let mut power_socket = power_socket_new(12.0, false);
+        assert_eq!(power_socket.power_rate, 12.0);
+        assert_eq!(power_socket.on, false);
+
+        assert_eq!(power_socket_is_on(&power_socket), false);
+        assert_eq!(power_socket_get_power(&power_socket), 0.0);
+
+        power_socket_set_on(&mut power_socket, true);
+
+        assert_eq!(power_socket_is_on(&power_socket), true);
+        assert_eq!(power_socket_get_power(&power_socket), 12.0);
+    }
+}