u_nesting_core/
timing.rs

1//! WASM-compatible timing abstraction.
2//!
3//! On native targets, uses [`std::time::Instant`] for wall-clock timing.
4//! On WASM (`wasm32`), provides a no-op timer that always reports zero elapsed time.
5//! This allows algorithms to compile and run on WASM without panicking,
6//! while still supporting time-based termination on native platforms.
7
8#[cfg(not(target_arch = "wasm32"))]
9mod inner {
10    use std::time::{Duration, Instant};
11
12    /// A wall-clock timer backed by [`Instant`] on native targets.
13    #[derive(Debug, Clone, Copy)]
14    pub struct Timer(Instant);
15
16    impl Timer {
17        /// Starts the timer.
18        pub fn now() -> Self {
19            Timer(Instant::now())
20        }
21
22        /// Returns the elapsed time since the timer was started.
23        pub fn elapsed(&self) -> Duration {
24            self.0.elapsed()
25        }
26
27        /// Returns elapsed time in milliseconds.
28        pub fn elapsed_ms(&self) -> u64 {
29            self.0.elapsed().as_millis() as u64
30        }
31    }
32}
33
34#[cfg(target_arch = "wasm32")]
35mod inner {
36    use std::time::Duration;
37
38    /// A no-op timer for WASM targets.
39    ///
40    /// Always reports zero elapsed time. Algorithms terminate via
41    /// iteration limits instead of wall-clock time on WASM.
42    #[derive(Debug, Clone, Copy)]
43    pub struct Timer;
44
45    impl Timer {
46        /// No-op: returns immediately.
47        pub fn now() -> Self {
48            Timer
49        }
50
51        /// Always returns [`Duration::ZERO`].
52        pub fn elapsed(&self) -> Duration {
53            Duration::ZERO
54        }
55
56        /// Always returns `0`.
57        pub fn elapsed_ms(&self) -> u64 {
58            0
59        }
60    }
61}
62
63pub use inner::Timer;
u_nesting_core/timing.rs

u_nesting_core/
timing.rs
