| // Copyright 2016 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. |
| |
| // compile-flags: -g |
| |
| extern crate issue_31702_1; |
| |
| use std::collections::HashMap; |
| use issue_31702_1::U256; |
| |
| pub struct Ethash { |
| engine_params: for<'a> fn() -> Option<&'a Vec<u8>>, |
| u256_params: HashMap<String, U256>, |
| } |
| |
| impl Ethash { |
| pub fn u256_param(&mut self, name: &str) -> U256 { |
| let engine = self.engine_params; |
| *self.u256_params.entry(name.to_owned()).or_insert_with(|| { |
| engine().map_or(U256::new(0u64), |_a| loop {}) |
| }) |
| } |
| } |
