41 lines
838 B
Rust
41 lines
838 B
Rust
//@ run-pass
|
|
#![allow(dead_code)]
|
|
// General test that function items in static blocks
|
|
// can be generated with a macro.
|
|
|
|
|
|
struct MyType {
|
|
desc: &'static str,
|
|
data: usize,
|
|
code: fn(usize, usize) -> usize
|
|
}
|
|
|
|
impl MyType {
|
|
fn eval(&self, a: usize) -> usize {
|
|
(self.code)(self.data, a)
|
|
}
|
|
}
|
|
|
|
macro_rules! codegen {
|
|
($e:expr, $v:expr) => {
|
|
{
|
|
fn generated(a: usize, b: usize) -> usize {
|
|
a - ($e * b)
|
|
}
|
|
MyType {
|
|
desc: "test",
|
|
data: $v,
|
|
code: generated
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static GENERATED_CODE_1: MyType = codegen!(2, 100);
|
|
static GENERATED_CODE_2: MyType = codegen!(5, 1000);
|
|
|
|
pub fn main() {
|
|
assert_eq!(GENERATED_CODE_1.eval(10), 80);
|
|
assert_eq!(GENERATED_CODE_2.eval(100), 500);
|
|
}
|