Macro rocket_codegen::catchers
source · catchers!() { /* proc-macro */ }
Expand description
Generates a Vec
of Catcher
s from a set of catcher paths.
The catchers!
macro expands a list of catcher paths into a Vec
of
their corresponding Catcher
structures. For example, given the following
catchers:
#[catch(404)]
fn not_found() { /* .. */ }
mod inner {
#[catch(400)]
pub fn unauthorized() { /* .. */ }
}
#[catch(default)]
fn default_catcher() { /* .. */ }
The catchers!
macro can be used as:
let my_catchers = catchers![not_found, inner::unauthorized, default_catcher];
assert_eq!(my_catchers.len(), 3);
let not_found = &my_catchers[0];
assert_eq!(not_found.code, Some(404));
let unauthorized = &my_catchers[1];
assert_eq!(unauthorized.code, Some(400));
let default = &my_catchers[2];
assert_eq!(default.code, None);
The grammar for catchers!
is defined as:
catchers := PATH (',' PATH)*
PATH := a path, as defined by Rust