31 lines
951 B
Rust
31 lines
951 B
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags: -g
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extern crate issue_31702_1;
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use std::collections::HashMap;
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use issue_31702_1::U256;
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pub struct Ethash {
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engine_params: for<'a> fn() -> Option<&'a Vec<u8>>,
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u256_params: HashMap<String, U256>,
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}
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impl Ethash {
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pub fn u256_param(&mut self, name: &str) -> U256 {
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let engine = self.engine_params;
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*self.u256_params.entry(name.to_owned()).or_insert_with(|| {
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engine().map_or(U256::new(0u64), |_a| loop {})
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})
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}
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}
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