| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // 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); |
| } |