38 lines
1.0 KiB
Rust
38 lines
1.0 KiB
Rust
// Copyright 2013-2014 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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use std::num::FromPrimitive;
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use std::int;
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#[derive(PartialEq, FromPrimitive, Debug)]
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enum A {
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Foo = int::MAX,
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Bar = 1,
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Baz = 3,
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Qux,
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}
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pub fn main() {
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let x: Option<A> = FromPrimitive::from_int(int::MAX);
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assert_eq!(x, Some(A::Foo));
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let x: Option<A> = FromPrimitive::from_int(1);
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assert_eq!(x, Some(A::Bar));
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let x: Option<A> = FromPrimitive::from_int(3);
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assert_eq!(x, Some(A::Baz));
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let x: Option<A> = FromPrimitive::from_int(4);
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assert_eq!(x, Some(A::Qux));
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let x: Option<A> = FromPrimitive::from_int(5);
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assert_eq!(x, None);
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}
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