Macro probe::probe

macro_rules! probe {
    ($provider : ident, $name : ident $(, $arg : expr) * $(,) ?) => { ... };
}

Define a static probe point.

This annotates a code location with a name and arguments, and compiles in metadata to let debugging tools locate it.

Arguments

• provider - An identifier for naming probe groups.

• name - An identifier for this specific probe.

• arg… - Optional data to provide with the probe. Any expression which can be cast as isize is allowed as an argument. The arguments might not be evaluated at all when a debugger is not attached to the probe, depending on the platform implementation, so don’t rely on side effects.

Example

use probe::probe;
fn main() {
    probe!(foo, main);

    let x = 42;
    probe!(foo, show_x, x);

    let y = Some(x);
    probe!(foo, show_y, match y {
        Some(n) => n,
        None    => -1
    });
}