57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
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// Copyright 2015 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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// Test a case of a trait which extends the same supertrait twice, but
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// with difference type parameters. Test that we can invoke the
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// various methods in various ways successfully.
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// See also `compile-fail/trait-repeated-supertrait-ambig.rs`.
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trait CompareTo<T> {
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fn same_as(&self, t: T) -> bool;
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}
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trait CompareToInts : CompareTo<i64> + CompareTo<u64> {
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}
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impl CompareTo<i64> for i64 {
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fn same_as(&self, t: i64) -> bool { *self == t }
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}
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impl CompareTo<u64> for i64 {
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fn same_as(&self, t: u64) -> bool { *self == (t as i64) }
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}
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impl CompareToInts for i64 { }
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fn with_obj(c: &CompareToInts) -> bool {
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c.same_as(22_i64) && c.same_as(22_u64)
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}
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fn with_trait<C:CompareToInts>(c: &C) -> bool {
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c.same_as(22_i64) && c.same_as(22_u64)
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}
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fn with_ufcs1<C:CompareToInts>(c: &C) -> bool {
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CompareToInts::same_as(c, 22_i64) && CompareToInts::same_as(c, 22_u64)
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}
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fn with_ufcs2<C:CompareToInts>(c: &C) -> bool {
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CompareTo::same_as(c, 22_i64) && CompareTo::same_as(c, 22_u64)
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}
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fn main() {
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assert_eq!(22_i64.same_as(22_i64), true);
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assert_eq!(22_i64.same_as(22_u64), true);
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assert_eq!(with_trait(&22), true);
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assert_eq!(with_obj(&22), true);
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assert_eq!(with_ufcs1(&22), true);
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assert_eq!(with_ufcs2(&22), true);
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}
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