30 lines
789 B
Rust
30 lines
789 B
Rust
// Copyright 2014 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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pub trait Number: NumConv {
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fn from<T:Number>(n: T) -> Self;
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}
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impl Number for f64 {
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fn from<T:Number>(n: T) -> f64 { n.to_float() }
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}
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pub trait NumConv {
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fn to_float(&self) -> f64;
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}
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impl NumConv for f64 {
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fn to_float(&self) -> f64 { *self }
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}
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pub fn main() {
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let _: f64 = Number::from(0.0f64);
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}
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