Crate makero[−][src]
Expand description
By default, macros are processed top-down; for example, foo!(bar!())
will
process the foo
macro first, using the literal tokens bar
!
(
)
, and
bar
will only be processed if foo
outputs those tokens verbatim.
Enter makero
. Inside makero
blocks, invoked helper macros will be
processed bottom-up; the below main
macro outputs true
, but removing
makero
would cause it to output false
instead, as the is_x
macro
would see make_x
!
(
)
instead of x
.
use makero::makero;
makero! {
macro_rules! main {
() => { is_x!(make_x!()) };
}
macro_rules! is_x {
(x) => { true };
($($x:tt)*) => { false };
}
macro_rules! make_x {
() => { x };
}
}
let out = main!();
assert_eq!(out, true);
The makero
macro accepts one or more macro_rules!
items; only the
top-most one will be externally visible.
Attributes can be applied to the resulting macro by applying them to the
top-most macro_rules!
definition.
Macros
The makero
macro; see the crate level documentation for
more details..